Dowty Standard O-ring Sizes - Precision Polymer Engineering Ltd

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Dowty Standard O-ring Sizes - Precision Polymer Engineering Ltd
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
0.74
1.07
1.42
1.78
2.57
2.90
3.69
4.47
5.28
6.07
7.66
9.25
10.82
12.42
14.00
15.60
17.16
18.77
20.35
21.95
23.52
25.12
26.7
28.3
29.87
31.47
33.05
34.65
37.82
41.00
44.17
47.37
50.52
53.67
56.87
60.04
63.22
66.40
69.57
72.76
75.92
82.27
88.62
94.97
101.32
107.67
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.10
0.10
0.10
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.18
0.23
0.23
0.23
0.23
0.23
0.23
0.25
0.25
0.25
0.28
0.28
0.28
0.33
0.33
0.33
0.38
0.38
0.46
0.46
0.46
0.46
0.46
0.51
0.51
0.51
0.61
0.61
0.61
0.69
0.69
0.76
1.02
1.27
1.53
1.78
DOWTY
Cross
Size
Section Reference
Tolerance
+/0.08
0.08
0.08
0.08
Precision Polymer Engineering Ltd
200-001
200-002
200-003
200-004
200-005
200-006
200-007
200-008
200-009
200-010
200-011
200-012
200-013
200-014
200-015
200-016
200-017
200-018
200-019
200-020
200-021
200-022
200-023
200-024
200-025
200-026
200-027
200-028
200-029
200-030
200-031
200-032
200-033
200-034
200-035
200-036
200-037
200-038
200-039
200-040
200-041
200-042
200-043
200-044
200-045
200-046
Alternative
Size Reference
BS1806-001
BS1806-002
BS1806-003
ISO3601 & BS1806 -004
ISO3601 & BS1806 -005
ISO3601 & BS1806 -006
ISO3601 & BS1806 -007
ISO3601 & BS1806 -008
ISO3601 & BS1806 -009
ISO3601 & BS1806 -010
ISO 3601 & BS1806 -011
ISO 3601 & BS1806 -012
ISO 3601 & BS1806 -013
ISO 3601 & BS1806 -014
ISO 3601 & BS1806 -015
ISO 3601 & BS1806 -016
ISO 3601 & BS1806 -017
ISO 3601 & BS1806 -018
ISO 3601 & BS1806 -019
ISO 3601 & BS1806 -020
ISO 3601 & BS1806 -021
ISO 3601 & BS1806 -022
ISO 3601 & BS1806 -023
ISO 3601 & BS1806 -024
ISO 3601 & BS1806 -025
ISO 3601 & BS1806 -026
ISO 3601 & BS1806 -027
ISO 3601 & BS1806 -028
ISO 3601 & BS1806 -029
ISO 3601 & BS1806 -030
ISO 3601 & BS1806 -031
ISO 3601 & BS1806 -032
ISO 3601 & BS1806 -033
ISO 3601 & BS1806 -034
ISO 3601 & BS1806 -035
ISO 3601 & BS1806 -036
ISO 3601 & BS1806 -037
ISO 3601 & BS1806 -038
ISO 3601 & BS1806 -039
ISO 3601 & BS1806 -040
ISO 3601 & BS1806 -041
ISO 3601 & BS1806 -042
ISO 3601 & BS1806 -043
ISO 3601 & BS1806 -044
ISO 3601 & BS1806 -045
ISO 3601 & BS1806 -046
Page 1
Internal
Diameter
(inches)
0.029
0.042
0.056
0.070
0.101
0.114
0.145
0.176
0.208
0.239
0.302
0.364
0.426
0.489
0.551
0.614
0.676
0.739
0.801
0.864
0.926
0.989
1.051
1.114
1.176
1.239
1.301
1.364
1.489
1.614
1.739
1.865
1.989
2.113
2.239
2.364
2.489
2.614
2.739
2.865
2.989
3.239
3.489
3.739
3.989
4.239
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.004
0.004
0.004
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.007
0.009
0.009
0.009
0.009
0.009
0.009
0.010
0.010
0.010
0.011
0.011
0.011
0.013
0.013
0.013
0.015
0.015
0.018
0.018
0.018
0.018
0.018
0.020
0.020
0.020
0.024
0.024
0.024
0.027
0.027
0.030
Cross
Section
Tolerance
+/-
0.04
0.05
0.06
0.003
0.003
0.003
0.07
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
114.02
120.37
126.72
133.07
1.24
2.06
2.84
3.63
4.42
5.23
6.02
7.59
9.19
10.77
12.37
13.94
15.54
17.12
18.72
20.29
21.89
23.47
25.07
26.64
28.24
29.82
31.42
32.99
34.59
36.17
37.77
39.34
40.94
42.52
44.12
45.69
47.29
48.90
50.47
52.07
53.64
55.25
56.82
58.42
59.99
61.60
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.76
0.76
0.94
0.94
0.10
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.18
0.23
0.23
0.23
0.25
0.25
0.25
0.25
0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.30
0.38
0.38
0.38
0.38
0.38
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.51
0.51
0.51
1.78
2.62
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
0.08
Precision Polymer Engineering Ltd
200-047
200-048
200-049
200-050
200-102
200-103
200-104
200-105
200-106
200-107
200-108
200-109
200-110
200-111
200-112
200-113
200-114
200-115
200-116
200-117
200-118
200-119
200-120
200-121
200-122
200-123
200-124
200-125
200-126
200-127
200-128
200-129
200-130
200-131
200-132
200-133
200-134
200-135
200-136
200-137
200-138
200-139
200-140
200-141
200-142
200-143
Alternative
Size Reference
ISO 3601 & BS1806 -047
ISO 3601 & BS1806 -048
ISO 3601 & BS1806 -049
ISO 3601 & BS1806 -050
ISO3601 & BS1806 -102
ISO3601 & BS1806 -103
ISO3601 & BS1806 -104
ISO3601 & BS1806 -105
ISO3601 & BS1806 -106
ISO3601 & BS1806 -107
ISO3601 & BS1806 -108
ISO3601 & BS1806 -109
ISO3601 & BS1806 -110
ISO3601 & BS1806 -111
ISO3601 & BS1806 -112
ISO3601 & BS1806 -113
ISO3601 & BS1806 -114
ISO3601 & BS1806 -115
ISO3601 & BS1806 -116
ISO3601 & BS1806 -117
ISO3601 & BS1806 -118
ISO3601 & BS1806 -119
ISO3601 & BS1806 -120
ISO3601 & BS1806 -121
ISO3601 & BS1806 -122
ISO3601 & BS1806 -123
ISO3601 & BS1806 -124
ISO3601 & BS1806 -125
ISO3601 & BS1806 -126
ISO3601 & BS1806 -127
ISO3601 & BS1806 -128
ISO3601 & BS1806 -129
ISO3601 & BS1806 -130
ISO3601 & BS1806 -131
ISO3601 & BS1806 -132
ISO3601 & BS1806 -133
ISO3601 & BS1806 -134
ISO3601 & BS1806 -135
ISO3601 & BS1806 -136
ISO3601 & BS1806 -137
ISO3601 & BS1806 -138
ISO3601 & BS1806 -139
ISO3601 & BS1806 -140
ISO3601 & BS1806 -141
ISO3601 & BS1806 -142
ISO3601 & BS1806 -143
Page 2
Internal
Diameter
(inches)
4.489
4.739
4.989
5.239
0.049
0.081
0.112
0.143
0.174
0.206
0.237
0.299
0.362
0.424
0.487
0.549
0.612
0.674
0.737
0.799
0.862
0.924
0.987
1.049
1.112
1.174
1.237
1.299
1.362
1.424
1.487
1.549
1.612
1.674
1.737
1.799
1.862
1.925
1.987
2.050
2.112
2.175
2.237
2.300
2.362
2.425
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.030
0.030
0.037
0.037
0.004
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.007
0.009
0.009
0.009
0.010
0.010
0.010
0.010
0.010
0.010
0.012
0.012
0.012
0.012
0.012
0.012
0.015
0.015
0.015
0.015
0.015
0.017
0.017
0.017
0.017
0.017
0.017
0.017
0.020
0.020
0.020
Cross
Section
Tolerance
+/-
0.07
0.003
0.103
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
63.17
64.77
66.34
67.95
69.52
71.12
72.69
75.87
82.22
88.57
94.92
101.27
107.62
113.97
120.32
126.67
133.02
139.37
145.72
152.07
158.42
164.77
171.12
177.47
183.82
190.17
196.52
202.87
209.22
215.57
221.92
228.27
234.62
240.97
247.32
4.34
5.94
7.52
9.12
10.69
12.29
13.87
15.47
17.04
18.64
20.22
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.51
0.51
0.51
0.56
0.56
0.56
0.56
0.61
0.61
0.61
0.71
0.71
0.76
0.76
0.76
0.89
0.89
0.89
0.89
0.89
1.02
1.02
1.02
1.02
1.14
1.14
1.14
1.14
1.27
1.27
1.27
1.27
1.40
1.40
1.40
0.13
0.13
0.13
0.13
0.13
0.13
0.18
0.23
0.23
0.25
0.25
2.62
3.53
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
0.10
Precision Polymer Engineering Ltd
200-144
200-145
200-146
200-147
200-148
200-149
200-150
200-151
200-152
200-153
200-154
200-155
200-156
200-157
200-158
200-159
200-160
200-161
200-162
200-163
200-164
200-165
200-166
200-167
200-168
200-169
200-170
200-171
200-172
200-173
200-174
200-175
200-176
200-177
200-178
200-201
200-202
200-203
200-204
200-205
200-206
200-207
200-208
200-209
200-210
200-211
Alternative
Size Reference
ISO3601 & BS1806 -144
ISO3601 & BS1806 -145
ISO3601 & BS1806 -146
ISO3601 & BS1806 -147
ISO3601 & BS1806 -148
ISO3601 & BS1806 -149
ISO3601 & BS1806 -150
ISO3601 & BS1806 -151
ISO3601 & BS1806 -152
ISO3601 & BS1806 -153
ISO3601 & BS1806 -154
ISO3601 & BS1806 -155
ISO3601 & BS1806 -156
ISO3601 & BS1806 -157
ISO3601 & BS1806 -158
ISO3601 & BS1806 -159
ISO3601 & BS1806 -160
ISO3601 & BS1806 -161
ISO3601 & BS1806 -162
ISO3601 & BS1806 -163
ISO3601 & BS1806 -164
ISO3601 & BS1806 -165
ISO3601 & BS1806 -166
ISO3601 & BS1806 -167
ISO3601 & BS1806 -168
ISO3601 & BS1806 -169
ISO3601 & BS1806 -170
ISO3601 & BS1806 -171
ISO3601 & BS1806 -172
ISO3601 & BS1806 -173
ISO3601 & BS1806 -174
ISO3601 & BS1806 -175
ISO3601 & BS1806 -176
ISO3601 & BS1806 -177
ISO3601 & BS1806 -178
ISO3601 & BS1806 -201
ISO3601 & BS1806 -202
ISO3601 & BS1806 -203
ISO3601 & BS1806 -204
ISO3601 & BS1806 -205
ISO3601 & BS1806 -206
ISO3601 & BS1806 -207
ISO3601 & BS1806 -208
ISO3601 & BS1806 -209
ISO3601 & BS1806 -210
ISO3601 & BS1806 -211
Page 3
Internal
Diameter
(inches)
2.487
2.550
2.612
2.675
2.737
2.800
2.862
2.987
3.237
3.487
3.737
3.987
4.237
4.487
4.737
4.987
5.237
5.487
5.737
5.987
6.237
6.487
6.737
6.987
7.237
7.487
7.737
7.987
8.237
8.487
8.737
8.987
9.237
9.487
9.737
0.171
0.234
0.296
0.359
0.421
0.484
0.546
0.609
0.671
0.734
0.796
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.020
0.020
0.020
0.022
0.022
0.022
0.022
0.024
0.024
0.024
0.028
0.028
0.030
0.030
0.030
0.035
0.035
0.035
0.035
0.035
0.040
0.040
0.040
0.040
0.045
0.045
0.045
0.045
0.050
0.050
0.050
0.050
0.055
0.055
0.055
0.005
0.005
0.005
0.005
0.005
0.005
0.007
0.009
0.009
0.010
0.010
Cross
Section
Tolerance
+/-
0.103
0.003
0.139
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
21.82
23.39
24.99
26.57
28.17
29.74
31.34
32.92
34.52
36.09
37.69
40.87
44.04
47.22
50.39
53.57
56.74
59.92
63.09
66.27
69.44
72.62
75.79
78.97
82.14
85.32
88.49
91.67
94.84
98.02
101.19
104.37
107.54
110.72
113.89
117.07
120.24
123.42
126.59
129.77
132.94
136.12
139.29
142.47
145.64
148.82
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.25
0.25
0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.30
0.38
0.38
0.38
0.46
0.46
0.46
0.51
0.51
0.51
0.51
0.61
0.61
0.61
0.61
0.61
0.61
0.61
0.71
0.71
0.71
0.71
0.71
0.76
0.76
0.76
0.76
0.76
0.89
0.89
0.89
0.89
0.89
0.89
0.89
0.89
0.89
3.53
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
200-212
200-213
200-214
200-215
200-216
200-217
200-218
200-219
200-220
200-221
200-222
200-223
200-224
200-225
200-226
200-227
200-228
200-229
200-230
200-231
200-232
200-233
200-234
200-235
200-236
200-237
200-238
200-239
200-240
200-241
200-242
200-243
200-244
200-245
200-246
200-247
200-248
200-249
200-250
200-251
200-252
200-253
200-254
200-255
200-256
200-257
Alternative
Size Reference
ISO3601 & BS1806 -212
ISO3601 & BS1806 -213
ISO3601 & BS1806 -214
ISO3601 & BS1806 -215
ISO3601 & BS1806 -216
ISO3601 & BS1806 -217
ISO3601 & BS1806 -218
ISO3601 & BS1806 -219
ISO3601 & BS1806 -220
ISO3601 & BS1806 -221
ISO3601 & BS1806 -222
ISO3601 & BS1806 -223
ISO3601 & BS1806 -224
ISO3601 & BS1806 -225
ISO3601 & BS1806 -226
ISO3601 & BS1806 -227
ISO3601 & BS1806 -228
ISO3601 & BS1806 -229
ISO3601 & BS1806 -230
ISO3601 & BS1806 -231
ISO3601 & BS1806 -232
ISO3601 & BS1806 -233
ISO3601 & BS1806 -234
ISO3601 & BS1806 -235
ISO3601 & BS1806 -236
ISO3601 & BS1806 -237
ISO3601 & BS1806 -238
ISO3601 & BS1806 -239
ISO3601 & BS1806 -240
ISO3601 & BS1806 -241
ISO3601 & BS1806 -242
ISO3601 & BS1806 -243
ISO3601 & BS1806 -244
ISO3601 & BS1806 -245
ISO3601 & BS1806 -246
ISO3601 & BS1806 -247
ISO3601 & BS1806 -248
ISO3601 & BS1806 -249
ISO3601 & BS1806 -250
ISO3601 & BS1806 -251
ISO3601 & BS1806 -252
ISO3601 & BS1806 -253
ISO3601 & BS1806 -254
ISO3601 & BS1806 -255
ISO3601 & BS1806 -256
ISO3601 & BS1806 -257
Page 4
Internal
Diameter
(inches)
0.859
0.921
0.984
1.046
1.109
1.171
1.234
1.296
1.359
1.421
1.484
1.609
1.734
1.859
1.984
2.109
2.234
2.359
2.484
2.609
2.734
2.859
2.984
3.109
3.234
3.359
3.484
3.609
3.734
3.859
3.984
4.109
4.234
4.359
4.484
4.609
4.734
4.859
4.984
5.109
5.234
5.359
5.484
5.609
5.734
5.859
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.010
0.010
0.010
0.010
0.012
0.012
0.012
0.012
0.012
0.012
0.015
0.015
0.015
0.018
0.018
0.018
0.020
0.020
0.020
0.020
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.028
0.028
0.028
0.028
0.028
0.030
0.030
0.030
0.030
0.030
0.035
0.035
0.035
0.035
0.035
0.035
0.035
0.035
0.035
0.139
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
151.99
158.34
164.69
171.04
177.39
183.74
190.09
196.44
202.79
209.14
215.49
221.84
228.19
234.54
240.89
247.24
253.59
266.29
278.99
291.69
304.39
329.79
355.19
380.57
405.26
430.66
456.06
10.46
12.07
13.64
15.24
16.81
18.42
19.99
21.59
23.16
24.77
26.34
27.94
29.51
31.12
32.69
34.29
37.47
40.64
43.82
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.89
1.02
1.02
1.02
1.02
1.14
1.14
1.14
1.14
1.27
1.27
1.27
1.27
1.40
1.40
1.40
1.40
1.40
1.65
1.65
1.65
1.65
1.65
1.65
1.91
2.03
2.16
0.13
0.13
0.18
0.23
0.23
0.25
0.25
0.25
0.25
0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.38
0.38
0.38
3.53
5.33
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
0.13
Precision Polymer Engineering Ltd
200-258
200-259
200-260
200-261
200-262
200-263
200-264
200-265
200-266
200-267
200-268
200-269
200-270
200-271
200-272
200-273
200-274
200-275
200-276
200-277
200-278
200-279
200-280
200-281
200-282
200-283
200-284
200-309
200-310
200-311
200-312
200-313
200-314
200-315
200-316
200-317
200-318
200-319
200-320
200-321
200-322
200-323
200-324
200-325
200-326
200-327
Alternative
Size Reference
ISO3601 & BS1806 -258
ISO3601 & BS1806 -259
ISO3601 & BS1806 -260
ISO3601 & BS1806 -261
ISO3601 & BS1806 -262
ISO3601 & BS1806 -263
ISO3601 & BS1806 -264
ISO3601 & BS1806 -265
ISO3601 & BS1806 -266
ISO3601 & BS1806 -267
ISO3601 & BS1806 -268
ISO3601 & BS1806 -269
ISO3601 & BS1806 -270
ISO3601 & BS1806 -271
ISO3601 & BS1806 -272
ISO3601 & BS1806 -273
ISO3601 & BS1806 -274
ISO3601 & BS1806 -275
ISO3601 & BS1806 -276
ISO3601 & BS1806 -277
ISO3601 & BS1806 -278
ISO3601 & BS1806 -279
ISO3601 & BS1806 -280
ISO3601 & BS1806 -281
ISO3601 & BS1806 -282
ISO3601 & BS1806 -283
ISO3601 & BS1806 -284
ISO3601 & BS1806 -309
ISO3601 & BS1806 -310
ISO3601 & BS1806 -311
ISO3601 & BS1806 -312
ISO3601 & BS1806 -313
ISO3601 & BS1806 -314
ISO3601 & BS1806 -315
ISO3601 & BS1806 -316
ISO3601 & BS1806 -317
ISO3601 & BS1806 -318
ISO3601 & BS1806 -319
ISO3601 & BS1806 -320
ISO3601 & BS1806 -321
ISO3601 & BS1806 -322
ISO3601 & BS1806 -323
ISO3601 & BS1806 -324
ISO3601& BS1806 -325, R28
ISO3601& BS1806 -326, R29
ISO3601& BS1806 -327, R30
Page 5
Internal
Diameter
(inches)
5.984
6.234
6.484
6.734
6.984
7.234
7.484
7.734
7.984
8.234
8.484
8.734
8.984
9.234
9.484
9.734
9.984
10.484
10.984
11.484
11.984
12.984
13.984
14.983
15.955
16.955
17.955
0.412
0.475
0.537
0.600
0.662
0.725
0.787
0.850
0.912
0.975
1.037
1.100
1.162
1.225
1.287
1.350
1.475
1.600
1.725
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.035
0.040
0.040
0.040
0.040
0.045
0.045
0.045
0.045
0.050
0.050
0.050
0.050
0.055
0.055
0.055
0.055
0.055
0.065
0.065
0.065
0.065
0.065
0.065
0.075
0.080
0.085
0.005
0.005
0.007
0.009
0.009
0.010
0.010
0.010
0.010
0.010
0.010
0.012
0.012
0.012
0.012
0.012
0.015
0.015
0.015
Cross
Section
Tolerance
+/-
0.139
0.004
0.21
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
46.99
50.17
53.34
56.52
59.69
62.87
66.04
69.22
72.39
75.57
78.74
81.92
85.09
88.27
91.44
94.62
97.79
100.97
104.14
107.32
110.49
113.67
116.84
120.02
123.19
126.37
129.54
132.72
135.89
139.07
142.24
145.42
148.59
151.77
158.12
164.47
170.82
177.17
183.52
189.87
196.22
202.57
208.92
215.27
221.62
227.97
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.38
0.46
0.46
0.46
0.46
0.51
0.51
0.51
0.51
0.61
0.61
0.61
0.61
0.61
0.71
0.71
0.71
0.71
0.71
0.76
0.76
0.76
0.76
0.76
0.76
0.94
0.94
0.94
0.94
0.94
0.94
0.94
0.94
0.94
1.02
1.02
1.02
1.02
1.14
1.14
1.14
1.14
1.27
1.27
1.27
1.27
5.33
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.13
Precision Polymer Engineering Ltd
200-328
200-329
200-330
200-331
200-332
200-333
200-334
200-335
200-336
200-337
200-338
200-339
200-340
200-341
200-342
200-343
200-344
200-345
200-346
200-347
200-348
200-349
200-350
200-351
200-352
200-353
200-354
200-355
200-356
200-357
200-358
200-359
200-360
200-361
200-362
200-363
200-364
200-365
200-366
200-367
200-368
200-369
200-370
200-371
200-372
200-373
Alternative
Size Reference
ISO3601& BS1806 -328, R31
ISO3601& BS1806 -329, R32
ISO3601& BS1806 -330, R33
ISO3601& BS1806 -331, R34
ISO3601& BS1806 -332, R35
ISO3601& BS1806 -333, R36
ISO3601& BS1806 -334, R37
ISO3601& BS1806 -335, R38
ISO3601& BS1806 -336, R39
ISO3601& BS1806 -337, R40
ISO3601& BS1806 -338, R41
ISO3601& BS1806 -339, R42
ISO3601& BS1806 -340, R43
ISO3601& BS1806 -341, R44
ISO3601& BS1806 -342, R45
ISO3601& BS1806 -343, R46
ISO3601& BS1806 -344, R47
ISO3601& BS1806 -345, R48
ISO3601& BS1806 -346, R49
ISO3601& BS1806 -347, R50
ISO3601& BS1806 -348, R51
ISO3601& BS1806 -349, R52
ISO3601 & BS1806 -350
ISO3601 & BS1806 -351
ISO3601 & BS1806 -352
ISO3601 & BS1806 -353
ISO3601 & BS1806 -354
ISO3601 & BS1806 -355
ISO3601 & BS1806 -356
ISO3601 & BS1806 -357
ISO3601 & BS1806 -358
ISO3601 & BS1806 -359
ISO3601 & BS1806 -360
ISO3601 & BS1806 -361
ISO3601 & BS1806 -362
ISO3601 & BS1806 -363
ISO3601 & BS1806 -364
ISO3601 & BS1806 -365
ISO3601 & BS1806 -366
ISO3601 & BS1806 -367
ISO3601 & BS1806 -368
ISO3601 & BS1806 -369
ISO3601 & BS1806 -370
ISO3601 & BS1806 -371
ISO3601 & BS1806 -372
ISO3601 & BS1806 -373
Page 6
Internal
Diameter
(inches)
1.850
1.975
2.100
2.225
2.350
2.475
2.600
2.725
2.850
2.975
3.100
3.225
3.350
3.475
3.600
3.725
3.850
3.975
4.100
4.225
4.350
4.475
4.600
4.725
4.850
4.975
5.100
5.225
5.350
5.475
5.600
5.725
5.850
5.975
6.225
6.475
6.725
6.975
7.225
7.475
7.725
7.975
8.225
8.475
8.725
8.975
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.015
0.018
0.018
0.018
0.018
0.020
0.020
0.020
0.020
0.024
0.024
0.024
0.024
0.024
0.028
0.028
0.028
0.028
0.028
0.030
0.030
0.030
0.030
0.030
0.030
0.037
0.037
0.037
0.037
0.037
0.037
0.037
0.037
0.037
0.040
0.040
0.040
0.040
0.045
0.045
0.045
0.045
0.050
0.050
0.050
0.050
0.21
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
234.32
240.67
247.02
253.37
266.07
278.77
291.47
304.17
329.57
354.97
380.37
405.26
430.66
456.06
481.46
506.86
532.26
557.66
582.68
608.08
633.48
658.88
113.67
116.84
120.02
123.2
126.37
129.54
132.72
135.9
139.07
142.24
145.42
148.6
151.77
158.12
164.47
170.82
177.17
183.52
189.87
196.22
202.57
215.27
227.97
240.67
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.40
1.40
1.40
1.40
1.52
1.52
1.65
1.65
1.65
1.78
1.78
1.91
2.03
2.16
2.29
2.41
2.41
2.54
2.67
2.79
2.92
3.05
0.84
0.84
0.84
0.84
0.94
0.94
0.94
0.94
0.94
0.94
0.94
0.94
0.94
1.02
1.02
1.02
1.02
1.14
1.14
1.14
1.14
1.40
1.40
1.40
5.33
6.99
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.13
0.15
Precision Polymer Engineering Ltd
200-374
200-375
200-376
200-377
200-378
200-379
200-380
200-381
200-382
200-383
200-384
200-385
200-386
200-387
200-388
200-389
200-390
200-391
200-392
200-393
200-394
200-395
200-425
200-426
200-427
200-428
200-429
200-430
200-431
200-432
200-433
200-434
200-435
200-436
200-437
200-438
200-439
200-440
200-441
200-442
200-443
200-444
200-445
200-446
200-447
200-448
Alternative
Size Reference
ISO3601 & BS1806 -374
ISO3601 & BS1806 -375
ISO3601 & BS1806 -376
ISO3601 & BS1806 -377
ISO3601 & BS1806 -378
ISO3601 & BS1806 -379
ISO3601 & BS1806 -380
ISO3601 & BS1806 -381
ISO3601 & BS1806 -382
ISO3601 & BS1806 -383
ISO3601 & BS1806 -384
ISO3601 & BS1806 -385
ISO3601 & BS1806 -386
ISO3601 & BS1806 -387
ISO3601 & BS1806 -388
ISO3601 & BS1806 -389
ISO3601 & BS1806 -390
ISO3601 & BS1806 -391
ISO3601 & BS1806 -392
ISO3601 & BS1806 -393
ISO3601 & BS1806 -394
ISO3601 & BS1806 -395
ISO3601 & BS1806 -425, R53
ISO3601 & BS1806 -426, R54
ISO3601 & BS1806 -427, R55
ISO3601 & BS1806 -428, R56
ISO3601 & BS1806 -429, R57
ISO3601 & BS1806 -430, R58
ISO3601 & BS1806 -431, R59
ISO3601 & BS1806 -432, R60
ISO3601 & BS1806 -433, R61
ISO3601 & BS1806 -434, R62
ISO3601 & BS1806 -435, R63
ISO3601 & BS1806 -436, R64
ISO3601 & BS1806 -437, R65
ISO3601 & BS1806 -438, R66
ISO3601 & BS1806 -439, R67
ISO3601 & BS1806 -440, R68
ISO3601 & BS1806 -441, R69
ISO3601 & BS1806 -442, R70
ISO3601 & BS1806 -443, R71
ISO3601 & BS1806 -444, R72
ISO3601 & BS1806 -445, R73
ISO3601 & BS1806 -446, R74
ISO3601 & BS1806 -447, R75
ISO3601 & BS1806 -448, R76
Page 7
Internal
Diameter
(inches)
9.225
9.475
9.725
9.975
10.475
10.975
11.475
11.975
12.975
13.975
14.975
15.955
16.955
17.955
18.955
19.955
20.955
21.955
22.94
23.94
24.94
25.94
4.475
4.600
4.725
4.850
4.975
5.100
5.225
5.350
5.475
5.600
5.725
5.850
5.975
6.225
6.475
6.725
6.975
7.225
7.475
7.725
7.975
8.475
8.975
9.475
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.055
0.055
0.055
0.055
0.060
0.060
0.065
0.065
0.065
0.070
0.070
0.075
0.080
0.085
0.090
0.095
0.095
0.100
0.105
0.110
0.115
0.120
0.033
0.033
0.033
0.033
0.037
0.037
0.037
0.037
0.037
0.037
0.037
0.037
0.037
0.040
0.040
0.040
0.040
0.045
0.045
0.045
0.045
0.055
0.055
0.055
Cross
Section
Tolerance
+/-
0.21
0.005
0.275
0.006
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
253.57
266.07
278.77
291.47
304.17
316.87
329.57
342.27
354.97
367.67
380.37
393.07
405.26
417.96
430.66
443.36
456.06
468.76
481.46
494.16
506.86
532.26
557.66
582.68
608.08
633.48
658.88
6.35
2.60
3.40
4.20
4.90
5.70
7.20
8.90
8.90
10.50
12.10
13.60
15.10
16.90
18.40
18.30
19.80
21.30
23.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.40
1.52
1.52
1.52
1.52
1.52
1.52
1.78
1.78
1.78
1.78
1.78
1.91
1.91
2.03
2.16
2.16
2.16
2.29
2.29
2.41
2.41
2.54
2.67
2.79
2.92
3.05
0.15
0.13
0.14
0.15
0.15
0.16
0.17
0.18
0.18
0.19
0.21
0.22
0.23
0.24
0.25
0.25
0.26
0.28
0.29
6.99
1.78
1.90
2.70
3.60
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.15
0.08
0.08
0.09
0.10
Precision Polymer Engineering Ltd
200-449
200-450
200-451
200-452
200-453
200-454
200-455
200-456
200-457
200-458
200-459
200-460
200-461
200-462
200-463
200-464
200-465
200-466
200-467
200-468
200-469
200-470
200-471
200-472
200-473
200-474
200-475
200-803
201-001
201-002
201-003
201-004
201-005
201-006
201-007
201-008
201-009
201-010
201-011
201-012
201-013
201-014
201-015
201-016
201-017
201-018
Alternative
Size Reference
ISO3601 & BS1806 -449, R77
ISO3601 & BS1806 -450, R78
ISO3601 & BS1806 -451, R79
ISO3601 & BS1806 -452, R80
ISO3601 & BS1806 -453, R81
ISO3601 & BS1806 -454, R82
ISO3601 & BS1806 -455, R83
ISO3601 & BS1806 -456, R84
ISO3601 & BS1806 -457, R85
ISO3601 & BS1806 -458, R86
ISO3601 & BS1806 -459, R87
ISO3601 & BS1806 -460, R88
ISO3601 & BS1806 -461
ISO3601 & BS1806 -462
ISO3601 & BS1806 -463
ISO3601 & BS1806 -464
ISO3601 & BS1806 -465
ISO3601 & BS1806 -466
ISO3601 & BS1806 -467
ISO3601 & BS1806 -468
ISO3601 & BS1806 -469
ISO3601 & BS1806 -470
ISO3601 & BS1806 -471
ISO3601 & BS1806 -472
ISO3601 & BS1806 -473
ISO3601 & BS1806 -474
ISO3601 & BS1806 -475
-R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
Page 8
Internal
Diameter
(inches)
9.983
10.475
10.975
11.475
11.975
12.475
12.975
13.475
13.975
14.475
14.975
15.475
15.955
16.455
16.955
17.455
17.955
18.455
18.955
19.455
19.955
20.955
21.955
22.940
23.940
24.940
25.940
0.250
0.102
0.134
0.165
0.193
0.224
0.283
0.350
0.350
0.413
0.476
0.535
0.594
0.665
0.724
0.720
0.780
0.839
0.906
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.055
0.060
0.060
0.060
0.060
0.060
0.060
0.070
0.070
0.070
0.070
0.070
0.075
0.075
0.080
0.085
0.085
0.085
0.090
0.090
0.095
0.095
0.100
0.105
0.110
0.115
0.120
0.006
0.005
0.006
0.006
0.006
0.006
0.007
0.007
0.007
0.007
0.008
0.009
0.009
0.009
0.010
0.010
0.010
0.011
0.011
Cross
Section
Tolerance
+/-
0.275
0.006
0.070
0.003
0.075
0.003
0.106
0.004
0.142
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
24.60
26.20
27.80
29.30
30.80
32.50
34.10
35.60
37.30
1.15
2.20
2.40
2.75
9.52
16.00
25.00
29.10
41.40
54.40
27.30
43.40
3.10
3.10
4.10
4.10
5.10
5.10
6.10
6.10
7.10
7.10
8.10
8.10
9.10
9.10
10.10
10.10
11.10
11.10
12.10
12.10
13.10
13.10
14.10
14.10
15.10
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.3
0.31
0.32
0.34
0.35
0.36
0.37
0.39
0.39
0.13
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.30
0.40
0.20
0.30
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
3.60
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
1.00
1.60
1.90
1.60
1.78
1.90
2.40
2.55
0.08
0.08
0.08
0.08
0.08
0.08
0.08
0.08
5.30
0.13
2.70
3.60
0.09
0.10
1.60
0.08
Precision Polymer Engineering Ltd
201-019
201-020
201-021
201-022
201-023
201-024
201-025
201-026
201-027
201-110
201-111
201-112
201-121
201-128
201-132
201-139
201-140
201-149
201-153
201-160
201-169
202-505
202-505
202-506
202-506
202-507
202-507
202-508
202-508
202-509
202-509
202-510
202-510
202-511
202-511
202-512
202-512
202-513
202-513
202-514
202-514
202-515
202-515
202-516
202-516
202-517
Alternative
Size Reference
R19
R20
R21
R22
R23
R24
R25
R26
R27
R000
R00
R0
----------BS4518 0031-16
-BS4518 0041-16
-BS4518 0051-16
-BS4518 0061-16
-BS4518 0071-16
-BS4518 0081-16
-BS4518 0091-16
-BS4518 0101-16
-BS4518 0111-16
-BS4518 0121-16
-BS4518 0131-16
-BS4518 0141-16
--
Page 9
Internal
Diameter
(inches)
0.969
1.031
1.094
1.154
1.213
1.28
1.343
1.402
1.469
0.045
0.087
0.094
1.083
0.375
0.630
0.984
1.146
1.630
2.142
1.075
1.709
0.122
0.122
0.161
0.161
0.201
0.201
0.240
0.240
0.280
0.280
0.319
0.319
0.358
0.358
0.398
0.398
0.437
0.437
0.476
0.476
0.516
0.516
0.555
0.555
0.594
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.012
0.012
0.013
0.013
0.014
0.014
0.015
0.015
0.015
0.005
0.005
0.005
0.005
0.006
0.008
0.008
0.008
0.012
0.016
0.008
0.012
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
Cross
Section
Tolerance
+/-
0.142
0.004
0.039
0.063
0.075
0.063
0.07
0.075
0.094
0.100
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.209
0.005
0.106
0.142
0.004
0.004
0.063
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
15.10
16.10
16.10
17.10
17.10
18.10
18.10
19.10
19.10
20.10
21.10
22.10
22.10
25.10
25.10
27.10
27.10
29.10
29.10
32.10
32.10
35.10
35.10
37.10
37.10
3.30
4.30
5.30
6.30
7.30
8.30
9.30
10.30
11.30
12.30
13.30
14.30
15.30
16.30
17.30
18.30
19.30
20.30
21.30
22.30
23.30
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.20
0.20
0.20
0.20
0.20
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.30
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.25
0.25
0.25
0.25
0.25
0.25
1.60
2.40
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
0.08
Precision Polymer Engineering Ltd
202-517
202-518
202-518
202-519
202-519
202-520
202-520
202-521
202-521
202-522
202-523
202-524
202-524
202-525
202-525
202-526
202-526
202-527
202-527
202-528
202-528
202-529
202-529
202-530
202-530
202-605
202-606
202-607
202-608
202-609
202-610
202-611
202-612
202-613
202-614
202-615
202-616
202-617
202-618
202-619
202-620
202-621
202-622
202-623
202-624
202-625
Alternative
Size Reference
BS4518 0151-16
-BS4518 0161-16
-BS4518 0171-16
-BS4518 0181-16
-BS4518 0191-16
---BS4518 0221-16
-BS4518 0251-16
-BS4518 0271-16
-BS4518 0291-16
-BS4518 0321-16
-BS4518 0351-16
-BS4518 0371-16
----------------------
Page 10
Internal
Diameter
(inches)
0.594
0.634
0.634
0.673
0.673
0.713
0.713
0.752
0.752
0.791
0.831
0.870
0.870
0.988
0.988
1.067
1.067
1.146
1.146
1.264
1.264
1.382
1.382
1.461
1.461
0.130
0.169
0.209
0.248
0.287
0.327
0.366
0.406
0.445
0.484
0.524
0.563
0.602
0.642
0.681
0.720
0.760
0.799
0.839
0.878
0.917
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.008
0.008
0.008
0.008
0.008
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.012
0.012
0.012
0.012
0.012
0.012
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.010
0.010
0.010
0.010
0.010
0.010
Cross
Section
Tolerance
+/-
0.063
0.003
0.094
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
25.30
27.30
30.30
33.30
3.60
4.60
5.60
6.60
7.60
8.60
9.60
10.60
11.60
12.60
13.60
14.60
15.60
16.60
17.60
18.60
19.60
21.60
24.60
27.60
29.60
31.60
34.60
37.60
39.60
41.60
44.60
47.60
49.60
51.60
54.60
57.60
59.60
61.60
64.60
67.60
69.60
20.60
35.60
45.60
55.60
58.60
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.25
0.25
0.30
0.30
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.25
0.25
0.25
0.25
0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.25
0.30
0.30
0.40
0.40
2.40
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
Precision Polymer Engineering Ltd
202-626
202-627
202-628
202-629
202-630
202-631
202-632
202-633
202-634
202-635
202-636
202-637
202-638
202-639
202-640
202-641
202-642
202-643
202-644
202-645
202-646
202-647
202-648
202-649
202-650
202-651
202-652
202-653
202-654
202-655
202-656
202-657
202-658
202-659
202-660
202-661
202-662
202-663
202-664
202-665
202-666
202-670
202-672
202-673
202-674
202-675
Alternative
Size Reference
----BS4518 0036-24
BS4518 0046-24
BS4518 0056-24
BS4518 0066-24
BS4518 0076-24
BS4518 0086-24
BS4518 0096-24
BS4518 0106-24
BS4518 0116-24
BS4518 0126-24
BS4518 0136-24
BS4518 0146-24
BS4518 0156-24
BS4518 0166-24
BS4518 0176-24
BS4518 0186-24
BS4518 0196-24
BS4518 0216-24
BS4518 0246-24
BS4518 0276-24
BS4518 0296-24
BS4518 0316-24
BS4518 0346-24
BS4518 0376-24
BS4518 0396-24
BS4518 0416-24
BS4518 0446-24
BS4518 0476-24
BS4518 0496-24
BS4518 0516-24
BS4518 0546-24
BS4518 0576-24
BS4518 0596-24
BS4518 0616-24
BS4518 0646-24
BS4518 0676-24
BS4518 0696-24
BS4518 0206-24
BS4518 0356-24
BS4518 0456-24
BS4518 0556-24
BS4518 0586-24
Page 11
Internal
Diameter
(inches)
0.996
1.075
1.193
1.311
0.142
0.181
0.220
0.260
0.299
0.339
0.378
0.417
0.457
0.496
0.535
0.575
0.614
0.654
0.693
0.732
0.772
0.850
0.969
1.087
1.165
1.244
1.362
1.480
1.559
1.638
1.756
1.874
1.953
2.031
2.150
2.268
2.346
2.425
2.543
2.661
2.740
0.811
1.402
1.795
2.189
2.307
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.010
0.010
0.012
0.012
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.010
0.010
0.010
0.010
0.010
0.010
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.010
0.012
0.012
0.016
0.016
0.094
Cross
Section
Tolerance
+/-
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
62.60
17.20
18.20
19.20
20.20
21.20
22.20
24.20
25.20
26.20
28.20
29.20
30.20
31.20
32.20
34.20
35.20
36.20
37.20
39.20
40.20
42.20
44.20
45.20
46.20
49.50
49.50
50.20
54.50
54.50
55.20
56.20
57.20
59.50
59.50
60.50
62.20
64.50
64.50
69.50
69.50
74.50
74.50
79.50
79.50
84.50
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.40
0.20
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.50
2.40
3.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/0.08
0.10
Precision Polymer Engineering Ltd
202-676
202-705
202-706
202-707
202-708
202-709
202-710
202-711
202-712
202-713
202-714
202-715
202-716
202-717
202-718
202-719
202-720
202-721
202-722
202-723
202-724
202-725
202-726
202-727
202-728
202-729
202-729
202-730
202-731
202-731
202-732
202-733
202-734
202-735
202-735
202-736
202-737
202-738
202-738
202-739
202-739
202-740
202-740
202-741
202-741
202-742
Alternative
Size Reference
BS4518 0626-24
-------------------------BS4518 0495-30
--BS4518 0545-30
----BS4518 0595-30
---BS4518 0645-30
-BS4518 0695-30
-BS4518 0745-30
-BS4518 0795-30
--
Page 12
Internal
Diameter
(inches)
2.465
0.677
0.717
0.756
0.795
0.835
0.874
0.953
0.992
1.031
1.110
1.150
1.189
1.228
1.268
1.346
1.386
1.425
1.465
1.543
1.583
1.661
1.740
1.780
1.819
1.949
1.949
1.976
2.146
2.146
2.173
2.213
2.252
2.343
2.343
2.382
2.449
2.539
2.539
2.736
2.736
2.933
2.933
3.130
3.130
3.327
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.016
0.008
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.020
Cross
Section
Tolerance
+/-
0.094
0.003
0.118
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
84.50
89.50
89.50
94.50
94.50
99.50
99.50
104.50
104.50
109.50
109.50
114.50
114.50
119.50
119.50
124.50
124.50
129.50
129.50
134.50
134.50
139.50
139.50
144.50
144.50
149.50
154.50
159.50
164.50
169.50
174.50
179.50
184.50
189.50
194.50
199.50
219.50
229.50
239.50
249.50
19.50
21.50
22.50
24.50
25.50
26.50
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.25
0.25
0.25
0.25
0.25
0.25
3.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
202-742
202-743
202-743
202-744
202-744
202-745
202-745
202-746
202-746
202-747
202-747
202-748
202-748
202-749
202-749
202-750
202-750
202-751
202-751
202-752
202-752
202-753
202-753
202-754
202-754
202-755
202-756
202-757
202-758
202-759
202-760
202-761
202-762
202-763
202-764
202-765
202-767
202-768
202-769
202-770
202-771
202-772
202-773
202-774
202-775
202-776
Alternative
Size Reference
BS4518 0845-30
-BS4518 0895-30
-BS4518 0945-30
-BS4518 0995-30
-BS4518 1045-30
-BS4518 1095-30
-BS4518 1145-30
-BS4518 1195-30
-BS4518 1245-30
-BS4518 1295-30
-BS4518 1345-30
-BS4518 1395-30
-BS4518 1445-30
BS4518 1495-30
BS4518 1545-30
BS4518 1595-30
BS4518 1645-30
BS4518 1695-30
BS4518 1745-30
BS4518 1795-30
BS4518 1845-30
BS4518 1895-30
BS4518 1945-30
BS4518 1995-30
BS4518 2195-30
BS4518 2295-30
BS4518 2395-30
BS4518 2495-30
BS4518 0195-30
BS4518 0215-30
BS4518 0225-30
BS4518 0245-30
BS4518 0255-30
BS4518 0265-30
Page 13
Internal
Diameter
(inches)
3.327
3.524
3.524
3.720
3.720
3.917
3.917
4.114
4.114
4.311
4.311
4.508
4.508
4.705
4.705
4.902
4.902
5.098
5.098
5.295
5.295
5.492
5.492
5.689
5.689
5.886
6.083
6.280
6.476
6.673
6.870
7.067
7.264
7.461
7.657
7.854
8.642
9.035
9.429
9.823
0.768
0.846
0.886
0.965
1.004
1.043
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.010
0.010
0.010
0.010
0.010
0.010
0.118
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
27.50
29.50
31.50
32.50
34.50
35.50
36.50
37.50
39.50
41.50
42.50
44.50
209.50
55.50
57.50
62.50
244.50
35.20
36.20
37.20
39.20
41.20
44.30
45.30
47.30
49.30
51.30
52.30
54.30
57.30
59.30
61.30
62.30
64.30
67.30
69.30
71.30
72.30
74.30
77.30
79.30
81.30
82.30
84.30
87.30
89.30
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.80
0.40
0.40
0.40
0.80
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.50
0.50
0.50
0.50
0.50
3.00
5.70
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
0.13
Precision Polymer Engineering Ltd
202-777
202-778
202-779
202-780
202-781
202-782
202-783
202-784
202-785
202-786
202-787
202-788
202-789
202-790
202-791
202-792
202-793
202-805
202-806
202-807
202-808
202-809
202-810
202-811
202-812
202-813
202-814
202-815
202-816
202-817
202-818
202-819
202-820
202-821
202-822
202-823
202-824
202-825
202-826
202-827
202-828
202-829
202-830
202-831
202-832
202-833
Alternative
Size Reference
BS4518 0275-30
BS4518 0295-30
BS4518 0315-30
BS4518 0325-30
BS4518 0345-30
BS4518 0355-30
BS4518 0365-30
BS4518 0375-30
BS4518 0395-30
BS4518 0415-30
BS4518 0425-30
BS4518 0445-30
BS4518 2095-30
BS4518 0555-30
BS4518 0575-30
BS4518 0625-30
BS4518 2445-30
-----BS4518 0443-57
BS4518 0453-57
-BS4518 0493-57
-BS4518 0523-57
BS4518 0543-57
-BS4518 0593-57
-BS4518 0623-57
BS4518 0643-57
-BS4518 0693-57
--BS4518 0743-57
-BS4518 0793-57
--BS4518 0843-57
-BS4518 0893-57
Page 14
Internal
Diameter
(inches)
1.083
1.161
1.240
1.280
1.358
1.398
1.437
1.476
1.555
1.634
1.673
1.752
8.248
2.185
2.264
2.461
9.626
1.386
1.425
1.465
1.543
1.622
1.744
1.783
1.862
1.941
2.02
2.059
2.138
2.256
2.335
2.413
2.453
2.531
2.650
2.728
2.807
2.846
2.925
3.043
3.122
3.201
3.240
3.319
3.437
3.516
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.010
0.010
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.031
0.016
0.016
0.016
0.031
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.020
0.020
0.020
0.020
0.020
Cross
Section
Tolerance
+/-
0.118
0.004
0.224
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
92.30
94.30
97.30
99.30
104.30
109.30
114.30
119.30
124.30
129.30
134.30
139.30
144.30
149.30
154.30
159.30
164.30
169.30
174.30
179.30
184.30
189.30
194.30
199.30
204.30
209.30
219.30
229.30
239.30
249.30
259.30
269.30
279.30
289.30
299.30
319.30
339.30
359.30
379.30
399.30
419.30
439.30
459.30
479.30
499.30
55.30
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
1.00
1.00
1.00
1.00
1.00
1.50
1.50
1.50
1.50
1.50
2.00
2.00
2.00
2.00
2.00
0.40
5.70
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.13
Precision Polymer Engineering Ltd
202-834
202-835
202-836
202-837
202-838
202-839
202-840
202-841
202-842
202-843
202-844
202-845
202-846
202-847
202-848
202-849
202-850
202-851
202-852
202-853
202-854
202-855
202-856
202-857
202-858
202-859
202-860
202-861
202-862
202-863
202-864
202-865
202-866
202-867
202-868
202-869
202-870
202-871
202-872
202-873
202-874
202-875
202-876
202-877
202-878
202-879
Alternative
Size Reference
-BS4518 0943-57
-BS4518 0993-57
BS4518 1043-57
BS4518 1093-57
BS4518 1143-57
BS4518 1193-57
BS4518 1243-57
BS4518 1293-57
BS4518 1343-57
BS4518 1393-57
BS4518 1443-57
BS4518 1493-57
BS4518 1543-57
BS4518 1593-57
BS4518 1643-57
BS4518 1693-57
BS4518 1743-57
BS4518 1793-57
BS4518 1843-57
BS4518 1893-57
BS4518 1943-57
BS4518 1993-57
-BS4518 2093-57
BS4518 2193-57
BS4518 2293-57
BS4518 2393-57
BS4518 2493-57
BS4518 2593-57
BS4518 2693-57
BS4518 2793-57
BS4518 2893-57
BS4518 2993-57
BS4518 3193-57
BS4518 3393-57
BS4518 3593-57
BS4518 3793-57
BS4518 3993-57
BS4518 4193-57
BS4518 4393-57
BS4518 4593-57
BS4518 4793-57
BS4518 4993-57
BS4518 0553-57
Page 15
Internal
Diameter
(inches)
3.634
3.713
3.831
3.909
4.106
4.303
4.500
4.697
4.894
5.091
5.287
5.484
5.681
5.878
6.075
6.272
6.469
6.665
6.862
7.059
7.256
7.453
7.650
7.846
8.043
8.240
8.634
9.028
9.421
9.815
10.209
10.602
10.996
11.390
11.783
12.571
13.358
14.146
14.933
15.720
16.508
17.295
18.083
18.870
19.657
2.1770
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.039
0.039
0.039
0.039
0.039
0.059
0.059
0.059
0.059
0.059
0.079
0.079
0.079
0.079
0.079
0.016
0.224
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
309.30
389.30
489.30
144.1
149.1
154.1
159.1
164.1
169.1
174.1
179.1
184.1
189.1
194.1
199.1
209.1
219.1
229.1
239.1
249.1
204.1
234.1
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
16.00
17.00
18.00
19.00
20.00
21.00
22.00
23.00
24.00
25.00
26.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.50
1.50
2.00
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
5.70
8.40
2.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/0.12
0.15
0.08
Precision Polymer Engineering Ltd
202-890
202-891
202-892
202-905
202-906
202-907
202-908
202-909
202-910
202-911
202-912
202-913
202-914
202-915
202-916
202-917
202-918
202-919
202-920
202-921
202-922
202-923
204-003
204-004
204-005
204-006
204-007
204-008
204-009
204-010
204-011
204-012
204-013
204-014
204-015
204-016
204-017
204-018
204-019
204-020
204-021
204-022
204-023
204-024
204-025
204-026
Alternative
Size Reference
BS4518 3093-57
BS4518 3893-57
BS4518 4893-57
BS4518 1441-84
BS4518 1491-84
BS4518 1541-84
BS4518 1591-84
BS4518 1641-84
BS4518 1691-84
BS4518 1741-84
BS4518 1791-84
BS4518 1841-84
BS4518 1891-84
BS4518 1941-84
BS4518 1991-84
BS4518 2091-84
BS4518 2191-84
BS4518 2291-84
BS4518 2391-84
BS4518 2491-84
BS4518 2041-84
BS4518 2341-84
-------------------------
Page 16
Internal
Diameter
(inches)
12.177
15.327
19.264
5.673
5.870
6.067
6.264
6.461
6.657
6.854
7.051
7.248
7.445
7.642
7.839
8.232
8.626
9.020
9.413
9.807
8.035
9.217
0.118
0.157
0.197
0.236
0.276
0.315
0.354
0.394
0.433
0.472
0.512
0.551
0.591
0.630
0.669
0.709
0.748
0.787
0.827
0.866
0.906
0.945
0.984
1.024
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.059
0.059
0.079
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
Cross
Section
Tolerance
+/-
0.224
0.005
0.331
0.006
0.079
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
27.00
28.00
29.00
30.00
31.00
32.00
33.00
34.00
35.00
36.00
37.00
38.00
39.00
40.00
41.00
42.00
43.00
44.00
45.00
46.00
47.00
48.00
49.00
50.00
51.00
52.00
53.00
54.00
55.00
56.00
57.00
58.00
59.00
60.00
61.00
62.00
63.00
64.00
65.00
66.00
67.00
68.00
69.00
70.00
71.00
72.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.25
0.25
0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
2.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-027
204-028
204-029
204-030
204-031
204-032
204-033
204-034
204-035
204-036
204-037
204-038
204-039
204-040
204-041
204-042
204-043
204-044
204-045
204-046
204-047
204-048
204-049
204-050
204-051
204-052
204-053
204-054
204-055
204-056
204-057
204-058
204-059
204-060
204-061
204-062
204-063
204-064
204-065
204-066
204-067
204-068
204-069
204-070
204-071
204-072
-----------------------------------------------
Page 17
Internal
Diameter
(inches)
1.063
1.102
1.142
1.181
1.220
1.260
1.299
1.339
1.378
1.417
1.457
1.496
1.535
1.575
1.614
1.654
1.693
1.732
1.772
1.811
1.850
1.890
1.929
1.969
2.008
2.047
2.087
2.126
2.165
2.205
2.244
2.283
2.323
2.362
2.402
2.441
2.480
2.520
2.559
2.598
2.638
2.677
2.717
2.756
2.795
2.835
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.010
0.010
0.010
0.010
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.079
Cross
Section
Tolerance
+/-
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
73.00
74.00
75.00
76.00
77.00
78.00
79.00
80.00
81.00
82.00
83.00
84.00
85.00
86.00
87.00
88.00
89.00
90.00
91.00
92.00
93.00
94.00
95.00
96.00
97.00
98.00
99.00
100.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
16.00
17.00
18.00
19.00
20.00
21.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.15
0.15
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.25
0.25
0.25
2.00
4.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-073
204-074
204-075
204-076
204-077
204-078
204-079
204-080
204-081
204-082
204-083
204-084
204-085
204-086
204-087
204-088
204-089
204-090
204-091
204-092
204-093
204-094
204-095
204-096
204-097
204-098
204-099
204-100
204-104
204-105
204-106
204-107
204-108
204-109
204-110
204-111
204-112
204-113
204-114
204-115
204-116
204-117
204-118
204-119
204-120
204-121
-----------------------------------------------
Page 18
Internal
Diameter
(inches)
2.874
2.913
2.953
2.992
3.031
3.071
3.110
3.150
3.189
3.228
3.268
3.307
3.346
3.386
3.425
3.465
3.504
3.543
3.583
3.622
3.661
3.701
3.740
3.780
3.819
3.858
3.898
3.937
0.157
0.197
0.236
0.276
0.315
0.354
0.394
0.433
0.472
0.512
0.551
0.591
0.630
0.669
0.709
0.748
0.787
0.827
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.006
0.006
0.006
0.006
0.006
0.006
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.010
0.010
0.010
Cross
Section
Tolerance
+/-
0.079
0.003
0.157
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
22.00
23.00
24.00
25.00
26.00
27.00
28.00
29.00
30.00
31.00
32.00
33.00
34.00
35.00
36.00
37.00
38.00
39.00
40.00
41.00
42.00
43.00
44.00
45.00
46.00
47.00
48.00
49.00
50.00
51.00
52.00
53.00
54.00
55.00
56.00
57.00
58.00
59.00
60.00
61.00
62.00
63.00
64.00
65.00
66.00
67.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
4.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-122
204-123
204-124
204-125
204-126
204-127
204-128
204-129
204-130
204-131
204-132
204-133
204-134
204-135
204-136
204-137
204-138
204-139
204-140
204-141
204-142
204-143
204-144
204-145
204-146
204-147
204-148
204-149
204-150
204-151
204-152
204-153
204-154
204-155
204-156
204-157
204-158
204-159
204-160
204-161
204-162
204-163
204-164
204-165
204-166
204-167
-----------------------------------------------
Page 19
Internal
Diameter
(inches)
0.866
0.906
0.945
0.984
1.024
1.063
1.102
1.142
1.181
1.220
1.260
1.299
1.339
1.378
1.417
1.457
1.496
1.535
1.575
1.614
1.654
1.693
1.732
1.772
1.811
1.850
1.890
1.929
1.969
2.008
2.047
2.087
2.126
2.165
2.205
2.244
2.283
2.323
2.362
2.402
2.441
2.480
2.520
2.559
2.598
2.638
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.157
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
68.00
69.00
70.00
71.00
72.00
73.00
74.00
75.00
76.00
77.00
78.00
79.00
80.00
81.00
82.00
83.00
84.00
85.00
86.00
87.00
88.00
89.00
90.00
91.00
92.00
93.00
94.00
95.00
96.00
97.00
98.00
99.00
100.00
101.00
102.00
103.00
104.00
105.00
106.00
107.00
108.00
109.00
110.00
111.00
112.00
113.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
4.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-168
204-169
204-170
204-171
204-172
204-173
204-174
204-175
204-176
204-177
204-178
204-179
204-180
204-181
204-182
204-183
204-184
204-185
204-186
204-187
204-188
204-189
204-190
204-191
204-192
204-193
204-194
204-195
204-196
204-197
204-198
204-199
204-200
204-201
204-202
204-203
204-204
204-205
204-206
204-207
204-208
204-209
204-210
204-211
204-212
204-213
-----------------------------------------------
Page 20
Internal
Diameter
(inches)
2.677
2.717
2.756
2.795
2.835
2.874
2.913
2.953
2.992
3.031
3.071
3.110
3.150
3.189
3.228
3.268
3.307
3.346
3.386
3.425
3.465
3.504
3.543
3.583
3.622
3.661
3.701
3.740
3.780
3.819
3.858
3.898
3.937
3.976
4.016
4.055
4.094
4.134
4.173
4.213
4.252
4.291
4.331
4.370
4.409
4.449
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.157
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
114.00
115.00
116.00
117.00
118.00
119.00
120.00
121.00
122.00
123.00
124.00
125.00
126.00
127.00
128.00
129.00
130.00
131.00
132.00
133.00
134.00
135.00
136.00
137.00
138.00
139.00
140.00
141.00
142.00
143.00
144.00
145.00
146.00
147.00
148.00
149.00
150.00
151.00
152.00
153.00
154.00
155.00
156.00
157.00
158.00
159.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
4.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-214
204-215
204-216
204-217
204-218
204-219
204-220
204-221
204-222
204-223
204-224
204-225
204-226
204-227
204-228
204-229
204-230
204-231
204-232
204-233
204-234
204-235
204-236
204-237
204-238
204-239
204-240
204-241
204-242
204-243
204-244
204-245
204-246
204-247
204-248
204-249
204-250
204-251
204-252
204-253
204-254
204-255
204-256
204-257
204-258
204-259
-----------------------------------------------
Page 21
Internal
Diameter
(inches)
4.488
4.528
4.567
4.606
4.646
4.685
4.724
4.764
4.803
4.843
4.882
4.921
4.961
5.000
5.039
5.079
5.118
5.157
5.197
5.236
5.276
5.315
5.354
5.394
5.433
5.472
5.512
5.551
5.591
5.630
5.669
5.709
5.748
5.787
5.827
5.866
5.906
5.945
5.984
6.024
6.063
6.102
6.142
6.181
6.220
6.260
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.157
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
160.00
161.00
162.00
163.00
164.00
165.00
166.00
167.00
168.00
169.00
170.00
171.00
172.00
173.00
174.00
175.00
176.00
177.00
178.00
179.00
180.00
181.00
182.00
183.00
184.00
185.00
186.00
187.00
188.00
189.00
190.00
191.00
192.00
193.00
194.00
195.00
196.00
197.00
198.00
199.00
200.00
201.00
202.00
203.00
204.00
205.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
4.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-260
204-261
204-262
204-263
204-264
204-265
204-266
204-267
204-268
204-269
204-270
204-271
204-272
204-273
204-274
204-275
204-276
204-277
204-278
204-279
204-280
204-281
204-282
204-283
204-284
204-285
204-286
204-287
204-288
204-289
204-290
204-291
204-292
204-293
204-294
204-295
204-296
204-297
204-298
204-299
204-300
204-301
204-302
204-303
204-304
204-305
-----------------------------------------------
Page 22
Internal
Diameter
(inches)
6.299
6.339
6.378
6.417
6.457
6.496
6.535
6.575
6.614
6.654
6.693
6.732
6.772
6.811
6.850
6.890
6.929
6.969
7.008
7.047
7.087
7.126
7.165
7.205
7.244
7.283
7.323
7.362
7.402
7.441
7.480
7.520
7.559
7.598
7.638
7.677
7.717
7.756
7.795
7.835
7.874
7.913
7.953
7.992
8.031
8.071
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.157
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
206.00
207.00
208.00
209.00
210.00
211.00
212.00
213.00
214.00
215.00
216.00
217.00
218.00
219.00
220.00
221.00
222.00
223.00
224.00
225.00
226.00
227.00
228.00
229.00
230.00
231.00
232.00
233.00
234.00
235.00
236.00
237.00
238.00
239.00
240.00
241.00
242.00
243.00
244.00
245.00
246.00
247.00
248.00
249.00
250.00
251.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
1.00
4.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-306
204-307
204-308
204-309
204-310
204-311
204-312
204-313
204-314
204-315
204-316
204-317
204-318
204-319
204-320
204-321
204-322
204-323
204-324
204-325
204-326
204-327
204-328
204-329
204-330
204-331
204-332
204-333
204-334
204-335
204-336
204-337
204-338
204-339
204-340
204-341
204-342
204-343
204-344
204-345
204-346
204-347
204-348
204-349
204-350
204-351
-----------------------------------------------
Page 23
Internal
Diameter
(inches)
8.110
8.150
8.189
8.228
8.268
8.307
8.346
8.386
8.425
8.465
8.504
8.543
8.583
8.622
8.661
8.701
8.740
8.780
8.819
8.858
8.898
8.937
8.976
9.016
9.055
9.094
9.134
9.173
9.213
9.252
9.291
9.331
9.370
9.409
9.449
9.488
9.528
9.567
9.606
9.646
9.685
9.724
9.764
9.803
9.843
9.882
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.039
0.157
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
252.00
253.00
254.00
255.00
256.00
257.00
258.00
259.00
260.00
261.00
262.00
263.00
264.00
265.00
266.00
267.00
268.00
269.00
270.00
271.00
272.00
273.00
274.00
275.00
276.00
277.00
278.00
279.00
280.00
281.00
282.00
283.00
284.00
285.00
286.00
287.00
288.00
289.00
290.00
291.00
292.00
293.00
294.00
295.00
296.00
297.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
4.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-352
204-353
204-354
204-355
204-356
204-357
204-358
204-359
204-360
204-361
204-362
204-363
204-364
204-365
204-366
204-367
204-368
204-369
204-370
204-371
204-372
204-373
204-374
204-375
204-376
204-377
204-378
204-379
204-380
204-381
204-382
204-383
204-384
204-385
204-386
204-387
204-388
204-389
204-390
204-391
204-392
204-393
204-394
204-395
204-396
204-397
-----------------------------------------------
Page 24
Internal
Diameter
(inches)
9.921
9.961
10.000
10.039
10.079
10.118
10.157
10.197
10.236
10.276
10.315
10.354
10.394
10.433
10.472
10.512
10.551
10.591
10.630
10.669
10.709
10.748
10.787
10.827
10.866
10.906
10.945
10.984
11.024
11.063
11.102
11.142
11.181
11.220
11.260
11.299
11.339
11.378
11.417
11.457
11.496
11.535
11.575
11.614
11.654
11.693
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.157
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
298.00
299.00
300.00
301.00
302.00
303.00
304.00
305.00
306.00
307.00
308.00
309.00
310.00
311.00
312.00
313.00
314.00
315.00
316.00
317.00
318.00
319.00
320.00
321.00
322.00
323.00
324.00
325.00
326.00
327.00
328.00
329.00
330.00
331.00
332.00
333.00
334.00
335.00
336.00
337.00
338.00
339.00
340.00
341.00
342.00
343.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.00
1.00
1.00
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
4.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-398
204-399
204-400
204-401
204-402
204-403
204-404
204-405
204-406
204-407
204-408
204-409
204-410
204-411
204-412
204-413
204-414
204-415
204-416
204-417
204-418
204-419
204-420
204-421
204-422
204-423
204-424
204-425
204-426
204-427
204-428
204-429
204-430
204-431
204-432
204-433
204-434
204-435
204-436
204-437
204-438
204-439
204-440
204-441
204-442
204-443
-----------------------------------------------
Page 25
Internal
Diameter
(inches)
11.732
11.772
11.811
11.850
11.890
11.929
11.969
12.008
12.047
12.087
12.126
12.165
12.205
12.244
12.283
12.323
12.362
12.402
12.441
12.480
12.520
12.559
12.598
12.638
12.677
12.717
12.756
12.795
12.835
12.874
12.913
12.953
12.992
13.031
13.071
13.110
13.150
13.189
13.228
13.268
13.307
13.346
13.386
13.425
13.465
13.504
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.039
0.039
0.039
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.157
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
344.00
345.00
346.00
347.00
348.00
349.00
350.00
351.00
352.00
353.00
354.00
355.00
356.00
357.00
358.00
359.00
360.00
361.00
362.00
363.00
364.00
365.00
366.00
367.00
368.00
369.00
370.00
371.00
372.00
373.00
374.00
375.00
376.00
377.00
378.00
379.00
380.00
381.00
382.00
383.00
384.00
385.00
386.00
387.00
388.00
389.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.00
1.00
1.00
1.00
1.00
4.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-444
204-445
204-446
204-447
204-448
204-449
204-450
204-451
204-452
204-453
204-454
204-455
204-456
204-457
204-458
204-459
204-460
204-461
204-462
204-463
204-464
204-465
204-466
204-467
204-468
204-469
204-470
204-471
204-472
204-473
204-474
204-475
204-476
204-477
204-478
204-479
204-480
204-481
204-482
204-483
204-484
204-485
204-486
204-487
204-488
204-489
-----------------------------------------------
Page 26
Internal
Diameter
(inches)
13.543
13.583
13.622
13.661
13.701
13.740
13.780
13.819
13.858
13.898
13.937
13.976
14.016
14.055
14.094
14.134
14.173
14.213
14.252
14.291
14.331
14.370
14.409
14.449
14.488
14.528
14.567
14.606
14.646
14.685
14.724
14.764
14.803
14.843
14.882
14.921
14.961
15.000
15.039
15.079
15.118
15.157
15.197
15.236
15.276
15.315
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.039
0.039
0.039
0.039
0.039
0.157
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
390.00
391.00
392.00
393.00
394.00
395.00
396.00
397.00
398.00
399.00
400.00
401.00
402.00
403.00
404.00
405.00
406.00
407.00
408.00
409.00
410.00
411.00
412.00
413.00
414.00
415.00
416.00
417.00
418.00
419.00
420.00
421.00
422.00
423.00
424.00
425.00
426.00
427.00
428.00
429.00
430.00
431.00
432.00
433.00
434.00
435.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
4.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-490
204-491
204-492
204-493
204-494
204-495
204-496
204-497
204-498
204-499
204-500
204-501
204-502
204-503
204-504
204-505
204-506
204-507
204-508
204-509
204-510
204-511
204-512
204-513
204-514
204-515
204-516
204-517
204-518
204-519
204-520
204-521
204-522
204-523
204-524
204-525
204-526
204-527
204-528
204-529
204-530
204-531
204-532
204-533
204-534
204-535
-----------------------------------------------
Page 27
Internal
Diameter
(inches)
15.354
15.394
15.433
15.472
15.512
15.551
15.591
15.630
15.669
15.709
15.748
15.787
15.827
15.866
15.906
15.945
15.984
16.024
16.063
16.102
16.142
16.181
16.220
16.260
16.299
16.339
16.378
16.417
16.457
16.496
16.535
16.575
16.614
16.654
16.693
16.732
16.772
16.811
16.850
16.890
16.929
16.969
17.008
17.047
17.087
17.126
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.157
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
436.00
437.00
438.00
439.00
440.00
441.00
442.00
443.00
444.00
445.00
446.00
447.00
448.00
449.00
450.00
451.00
452.00
453.00
454.00
455.00
456.00
457.00
458.00
459.00
460.00
461.00
462.00
463.00
464.00
465.00
466.00
467.00
468.00
469.00
470.00
471.00
472.00
473.00
474.00
475.00
476.00
477.00
478.00
479.00
480.00
481.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
4.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-536
204-537
204-538
204-539
204-540
204-541
204-542
204-543
204-544
204-545
204-546
204-547
204-548
204-549
204-550
204-551
204-552
204-553
204-554
204-555
204-556
204-557
204-558
204-559
204-560
204-561
204-562
204-563
204-564
204-565
204-566
204-567
204-568
204-569
204-570
204-571
204-572
204-573
204-574
204-575
204-576
204-577
204-578
204-579
204-580
204-581
-----------------------------------------------
Page 28
Internal
Diameter
(inches)
17.165
17.205
17.244
17.283
17.323
17.362
17.402
17.441
17.480
17.520
17.559
17.598
17.638
17.677
17.717
17.756
17.795
17.835
17.874
17.913
17.953
17.992
18.031
18.071
18.110
18.150
18.189
18.228
18.268
18.307
18.346
18.386
18.425
18.465
18.504
18.543
18.583
18.622
18.661
18.701
18.740
18.780
18.819
18.858
18.898
18.937
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.157
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
482.00
483.00
484.00
485.00
486.00
487.00
488.00
489.00
490.00
491.00
492.00
493.00
494.00
495.00
496.00
497.00
498.00
499.00
500.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
16.00
17.00
18.00
19.00
20.00
21.00
22.00
23.00
24.00
25.00
26.00
27.00
28.00
29.00
30.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
4.00
5.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-582
204-583
204-584
204-585
204-586
204-587
204-588
204-589
204-590
204-591
204-592
204-593
204-594
204-595
204-596
204-597
204-598
204-599
204-600
204-604
204-605
204-606
204-607
204-608
204-609
204-610
204-611
204-612
204-613
204-614
204-615
204-616
204-617
204-618
204-619
204-620
204-621
204-622
204-623
204-624
204-625
204-626
204-627
204-628
204-629
204-630
-----------------------------------------------
Page 29
Internal
Diameter
(inches)
18.976
19.016
19.055
19.094
19.134
19.173
19.213
19.252
19.291
19.331
19.370
19.409
19.449
19.488
19.528
19.567
19.606
19.646
19.685
0.157
0.197
0.236
0.276
0.315
0.354
0.394
0.433
0.472
0.512
0.551
0.591
0.630
0.669
0.709
0.748
0.787
0.827
0.866
0.906
0.945
0.984
1.024
1.063
1.102
1.142
1.181
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
Cross
Section
Tolerance
+/-
0.157
0.005
0.197
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
31.00
32.00
33.00
34.00
35.00
36.00
37.00
38.00
39.00
40.00
41.00
42.00
43.00
44.00
45.00
46.00
47.00
48.00
49.00
50.00
51.00
52.00
53.00
54.00
55.00
56.00
57.00
58.00
59.00
60.00
61.00
62.00
63.00
64.00
65.00
66.00
67.00
68.00
69.00
70.00
71.00
72.00
73.00
74.00
75.00
76.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
5.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-631
204-632
204-633
204-634
204-635
204-636
204-637
204-638
204-639
204-640
204-641
204-642
204-643
204-644
204-645
204-646
204-647
204-648
204-649
204-650
204-651
204-652
204-653
204-654
204-655
204-656
204-657
204-658
204-659
204-660
204-661
204-662
204-663
204-664
204-665
204-666
204-667
204-668
204-669
204-670
204-671
204-672
204-673
204-674
204-675
204-676
-----------------------------------------------
Page 30
Internal
Diameter
(inches)
1.220
1.260
1.299
1.339
1.378
1.417
1.457
1.496
1.535
1.575
1.614
1.654
1.693
1.732
1.772
1.811
1.850
1.890
1.929
1.969
2.008
2.047
2.087
2.126
2.165
2.205
2.244
2.283
2.323
2.362
2.402
2.441
2.480
2.520
2.559
2.598
2.638
2.677
2.717
2.756
2.795
2.835
2.874
2.913
2.953
2.992
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.197
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
77.00
78.00
79.00
80.00
81.00
82.00
83.00
84.00
85.00
86.00
87.00
88.00
89.00
90.00
91.00
92.00
93.00
94.00
95.00
96.00
97.00
98.00
99.00
100.00
101.00
102.00
103.00
104.00
105.00
106.00
107.00
108.00
109.00
110.00
111.00
112.00
113.00
114.00
115.00
116.00
117.00
118.00
119.00
120.00
121.00
122.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.40
0.40
0.40
0.40
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.60
0.60
5.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-677
204-678
204-679
204-680
204-681
204-682
204-683
204-684
204-685
204-686
204-687
204-688
204-689
204-690
204-691
204-692
204-693
204-694
204-695
204-696
204-697
204-698
204-699
204-700
204-701
204-702
204-703
204-704
204-705
204-706
204-707
204-708
204-709
204-710
204-711
204-712
204-713
204-714
204-715
204-716
204-717
204-718
204-719
204-720
204-721
204-722
-----------------------------------------------
Page 31
Internal
Diameter
(inches)
3.031
3.071
3.110
3.150
3.189
3.228
3.268
3.307
3.346
3.386
3.425
3.465
3.504
3.543
3.583
3.622
3.661
3.701
3.740
3.780
3.819
3.858
3.898
3.937
3.976
4.016
4.055
4.094
4.134
4.173
4.213
4.252
4.291
4.331
4.370
4.409
4.449
4.488
4.528
4.567
4.606
4.646
4.685
4.724
4.764
4.803
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.016
0.016
0.016
0.016
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.024
0.024
0.197
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
123.00
124.00
125.00
126.00
127.00
128.00
129.00
130.00
131.00
132.00
133.00
134.00
135.00
136.00
137.00
138.00
139.00
140.00
141.00
142.00
143.00
144.00
145.00
146.00
147.00
148.00
149.00
150.00
151.00
152.00
153.00
154.00
155.00
156.00
157.00
158.00
159.00
160.00
161.00
162.00
163.00
164.00
165.00
166.00
167.00
168.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
5.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-723
204-724
204-725
204-726
204-727
204-728
204-729
204-730
204-731
204-732
204-733
204-734
204-735
204-736
204-737
204-738
204-739
204-740
204-741
204-742
204-743
204-744
204-745
204-746
204-747
204-748
204-749
204-750
204-751
204-752
204-753
204-754
204-755
204-756
204-757
204-758
204-759
204-760
204-761
204-762
204-763
204-764
204-765
204-766
204-767
204-768
-----------------------------------------------
Page 32
Internal
Diameter
(inches)
4.843
4.882
4.921
4.961
5.000
5.039
5.079
5.118
5.157
5.197
5.236
5.276
5.315
5.354
5.394
5.433
5.472
5.512
5.551
5.591
5.630
5.669
5.709
5.748
5.787
5.827
5.866
5.906
5.945
5.984
6.024
6.063
6.102
6.142
6.181
6.220
6.260
6.299
6.339
6.378
6.417
6.457
6.496
6.535
6.575
6.614
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
Cross
Section
Tolerance
+/0.005
0.197
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
169.00
170.00
171.00
172.00
173.00
174.00
175.00
176.00
177.00
178.00
179.00
180.00
181.00
182.00
183.00
184.00
185.00
186.00
187.00
188.00
189.00
190.00
191.00
192.00
193.00
194.00
195.00
196.00
197.00
198.00
199.00
200.00
201.00
202.00
203.00
204.00
205.00
206.00
207.00
208.00
209.00
210.00
211.00
212.00
213.00
214.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
5.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-769
204-770
204-771
204-772
204-773
204-774
204-775
204-776
204-777
204-778
204-779
204-780
204-781
204-782
204-783
204-784
204-785
204-786
204-787
204-788
204-789
204-790
204-791
204-792
204-793
204-794
204-795
204-796
204-797
204-798
204-799
204-800
204-801
204-802
204-803
204-804
204-805
204-806
204-807
204-808
204-809
204-810
204-811
204-812
204-813
204-814
-----------------------------------------------
Page 33
Internal
Diameter
(inches)
6.654
6.693
6.732
6.772
6.811
6.850
6.890
6.929
6.969
7.008
7.047
7.087
7.126
7.165
7.205
7.244
7.283
7.323
7.362
7.402
7.441
7.480
7.520
7.559
7.598
7.638
7.677
7.717
7.756
7.795
7.835
7.874
7.913
7.953
7.992
8.031
8.071
8.110
8.150
8.189
8.228
8.268
8.307
8.346
8.386
8.425
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.197
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
215.00
216.00
217.00
218.00
219.00
220.00
221.00
222.00
223.00
224.00
225.00
226.00
227.00
228.00
229.00
230.00
231.00
232.00
233.00
234.00
235.00
236.00
237.00
238.00
239.00
240.00
241.00
242.00
243.00
244.00
245.00
246.00
247.00
248.00
249.00
250.00
251.00
252.00
253.00
254.00
255.00
256.00
257.00
258.00
259.00
260.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
5.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-815
204-816
204-817
204-818
204-819
204-820
204-821
204-822
204-823
204-824
204-825
204-826
204-827
204-828
204-829
204-830
204-831
204-832
204-833
204-834
204-835
204-836
204-837
204-838
204-839
204-840
204-841
204-842
204-843
204-844
204-845
204-846
204-847
204-848
204-849
204-850
204-851
204-852
204-853
204-854
204-855
204-856
204-857
204-858
204-859
204-860
-----------------------------------------------
Page 34
Internal
Diameter
(inches)
8.465
8.504
8.543
8.583
8.622
8.661
8.701
8.740
8.780
8.819
8.858
8.898
8.937
8.976
9.016
9.055
9.094
9.134
9.173
9.213
9.252
9.291
9.331
9.370
9.409
9.449
9.488
9.528
9.567
9.606
9.646
9.685
9.724
9.764
9.803
9.843
9.882
9.921
9.961
10.000
10.039
10.079
10.118
10.157
10.197
10.236
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.197
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
261.00
262.00
263.00
264.00
265.00
266.00
267.00
268.00
269.00
270.00
271.00
272.00
273.00
274.00
275.00
276.00
277.00
278.00
279.00
280.00
281.00
282.00
283.00
284.00
285.00
286.00
287.00
288.00
289.00
290.00
291.00
292.00
293.00
294.00
295.00
296.00
297.00
298.00
299.00
300.00
301.00
302.00
303.00
304.00
305.00
306.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.50
1.50
1.50
1.50
1.50
1.50
5.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-861
204-862
204-863
204-864
204-865
204-866
204-867
204-868
204-869
204-870
204-871
204-872
204-873
204-874
204-875
204-876
204-877
204-878
204-879
204-880
204-881
204-882
204-883
204-884
204-885
204-886
204-887
204-888
204-889
204-890
204-891
204-892
204-893
204-894
204-895
204-896
204-897
204-898
204-899
204-900
204-901
204-902
204-903
204-904
204-905
204-906
-----------------------------------------------
Page 35
Internal
Diameter
(inches)
10.276
10.315
10.354
10.394
10.433
10.472
10.512
10.551
10.591
10.630
10.669
10.709
10.748
10.787
10.827
10.866
10.906
10.945
10.984
11.024
11.063
11.102
11.142
11.181
11.220
11.260
11.299
11.339
11.378
11.417
11.457
11.496
11.535
11.575
11.614
11.654
11.693
11.732
11.772
11.811
11.850
11.890
11.929
11.969
12.008
12.047
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.059
0.059
0.059
0.059
0.059
0.059
0.197
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
307.00
308.00
309.00
310.00
311.00
312.00
313.00
314.00
315.00
316.00
317.00
318.00
319.00
320.00
321.00
322.00
323.00
324.00
325.00
326.00
327.00
328.00
329.00
330.00
331.00
332.00
333.00
334.00
335.00
336.00
337.00
338.00
339.00
340.00
341.00
342.00
343.00
344.00
345.00
346.00
347.00
348.00
349.00
350.00
351.00
352.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
5.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-907
204-908
204-909
204-910
204-911
204-912
204-913
204-914
204-915
204-916
204-917
204-918
204-919
204-920
204-921
204-922
204-923
204-924
204-925
204-926
204-927
204-928
204-929
204-930
204-931
204-932
204-933
204-934
204-935
204-936
204-937
204-938
204-939
204-940
204-941
204-942
204-943
204-944
204-945
204-946
204-947
204-948
204-949
204-950
204-951
204-952
-----------------------------------------------
Page 36
Internal
Diameter
(inches)
12.087
12.126
12.165
12.205
12.244
12.283
12.323
12.362
12.402
12.441
12.480
12.520
12.559
12.598
12.638
12.677
12.717
12.756
12.795
12.835
12.874
12.913
12.953
12.992
13.031
13.071
13.110
13.150
13.189
13.228
13.268
13.307
13.346
13.386
13.425
13.465
13.504
13.543
13.583
13.622
13.661
13.701
13.740
13.780
13.819
13.858
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.197
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
353.00
354.00
355.00
356.00
357.00
358.00
359.00
360.00
361.00
362.00
363.00
364.00
365.00
366.00
367.00
368.00
369.00
370.00
371.00
372.00
373.00
374.00
375.00
376.00
377.00
378.00
379.00
380.00
381.00
382.00
383.00
384.00
385.00
386.00
387.00
388.00
389.00
390.00
391.00
392.00
393.00
394.00
395.00
396.00
397.00
398.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
5.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.12
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-953
204-954
204-955
204-956
204-957
204-958
204-959
204-960
204-961
204-962
204-963
204-964
204-965
204-966
204-967
204-968
204-969
204-970
204-971
204-972
204-973
204-974
204-975
204-976
204-977
204-978
204-979
204-980
204-981
204-982
204-983
204-984
204-985
204-986
204-987
204-988
204-989
204-990
204-991
204-992
204-993
204-994
204-995
204-996
204-997
204-998
-----------------------------------------------
Page 37
Internal
Diameter
(inches)
13.898
13.937
13.976
14.016
14.055
14.094
14.134
14.173
14.213
14.252
14.291
14.331
14.370
14.409
14.449
14.488
14.528
14.567
14.606
14.646
14.685
14.724
14.764
14.803
14.843
14.882
14.921
14.961
15.000
15.039
15.079
15.118
15.157
15.197
15.236
15.276
15.315
15.354
15.394
15.433
15.472
15.512
15.551
15.591
15.630
15.669
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.197
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
399.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
16.00
17.00
18.00
19.00
20.00
21.00
22.00
23.00
24.00
25.00
26.00
27.00
28.00
29.00
30.00
31.00
32.00
33.00
34.00
35.00
36.00
37.00
38.00
39.00
40.00
41.00
42.00
43.00
44.00
45.00
46.00
47.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.50
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
5.00
1.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/0.12
0.08
Precision Polymer Engineering Ltd
Alternative
Size Reference
204-999
206-003
206-004
206-005
206-006
206-007
206-008
206-009
206-010
206-011
206-012
206-013
206-014
206-015
206-016
206-017
206-018
206-019
206-020
206-021
206-022
206-023
206-024
206-025
206-026
206-027
206-028
206-029
206-030
206-031
206-032
206-033
206-034
206-035
206-036
206-037
206-038
206-039
206-040
206-041
206-042
206-043
206-044
206-045
206-046
206-047
-----------------------------------------------
Page 38
Internal
Diameter
(inches)
15.709
0.118
0.157
0.197
0.236
0.276
0.315
0.354
0.394
0.433
0.472
0.512
0.551
0.591
0.630
0.669
0.709
0.748
0.787
0.827
0.866
0.906
0.945
0.984
1.024
1.063
1.102
1.142
1.181
1.220
1.260
1.299
1.339
1.378
1.417
1.457
1.496
1.535
1.575
1.614
1.654
1.693
1.732
1.772
1.811
1.850
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.059
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
Cross
Section
Tolerance
+/-
0.197
0.005
0.059
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
48.00
49.00
50.00
51.00
52.00
53.00
54.00
55.00
56.00
57.00
58.00
59.00
60.00
61.00
62.00
63.00
64.00
65.00
66.00
67.00
68.00
69.00
70.00
71.00
72.00
73.00
74.00
75.00
76.00
77.00
78.00
79.0
80.00
81.00
82.00
83.00
84.00
85.00
86.00
87.00
88.00
89.00
90.00
91.00
92.00
93.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.30
0.30
0.30
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
1.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-048
206-049
206-050
206-051
206-052
206-053
206-054
206-055
206-056
206-057
206-058
206-059
206-060
206-061
206-062
206-063
206-064
206-065
206-066
206-067
206-068
206-069
206-070
206-071
206-072
206-073
206-074
206-075
206-076
206-077
206-078
206-079
206-080
206-081
206-082
206-083
206-084
206-085
206-086
206-087
206-088
206-089
206-090
206-091
206-092
206-093
-----------------------------------------------
Page 39
Internal
Diameter
(inches)
1.890
1.929
1.969
2.008
2.047
2.087
2.126
2.165
2.205
2.244
2.283
2.323
2.362
2.402
2.441
2.480
2.520
2.559
2.598
2.638
2.677
2.717
2.756
2.795
2.835
2.874
2.913
2.953
2.992
3.031
3.071
3.110
3.150
3.189
3.228
3.268
3.307
3.346
3.386
3.425
3.465
3.504
3.543
3.583
3.622
3.661
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.012
0.012
0.012
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
Cross
Section
Tolerance
+/0.003
0.059
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
94.00
95.00
96.00
97.00
98.00
99.00
100.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
16.00
17.00
18.00
19.00
20.00
21.00
22.00
23.00
24.00
25.00
26.00
27.00
28.00
29.00
30.00
31.00
32.00
33.00
34.00
35.00
36.00
37.00
38.00
39.00
40.00
41.00
42.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.15
0.15
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
1.50
2.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
0.08
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-094
206-095
206-096
206-097
206-098
206-099
206-100
206-104
206-105
206-106
206-107
206-108
206-109
206-110
206-111
206-112
206-113
206-114
206-115
206-116
206-117
206-118
206-119
206-120
206-121
206-122
206-123
206-124
206-125
206-126
206-127
206-128
206-129
206-130
206-131
206-132
206-133
206-134
206-135
206-136
206-137
206-138
206-139
206-140
206-141
206-142
-----------------------------------------------
Page 40
Internal
Diameter
(inches)
3.701
3.740
3.780
3.819
3.858
3.898
3.937
0.157
0.197
0.236
0.276
0.315
0.354
0.394
0.433
0.472
0.512
0.551
0.591
0.630
0.669
0.709
0.748
0.787
0.827
0.866
0.906
0.945
0.984
1.024
1.063
1.102
1.142
1.181
1.220
1.260
1.299
1.339
1.378
1.417
1.457
1.496
1.535
1.575
1.614
1.654
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.006
0.006
0.006
0.006
0.006
0.006
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
Cross
Section
Tolerance
+/-
0.059
0.003
0.098
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
43.00
44.00
45.00
46.00
47.00
48.00
49.00
50.00
51.00
52.00
53.00
54.00
55.00
56.00
57.00
58.00
59.00
60.00
61.00
62.00
63.00
64.00
65.00
66.00
67.00
68.00
69.00
70.00
71.00
72.00
73.00
74.00
75.00
76.00
77.00
78.00
79.00
80.00
81.00
82.00
83.00
84.00
85.00
86.00
87.00
88.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
2.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-143
206-144
206-145
206-146
206-147
206-148
206-149
206-150
206-151
206-152
206-153
206-154
206-155
206-156
206-157
206-158
206-159
206-160
206-161
206-162
206-163
206-164
206-165
206-166
206-167
206-168
206-169
206-170
206-171
206-172
206-173
206-174
206-175
206-176
206-177
206-178
206-179
206-180
206-181
206-182
206-183
206-184
206-185
206-186
206-187
206-188
-----------------------------------------------
Page 41
Internal
Diameter
(inches)
1.693
1.732
1.772
1.811
1.850
1.890
1.929
1.969
2.008
2.047
2.087
2.126
2.165
2.205
2.244
2.283
2.323
2.362
2.402
2.441
2.480
2.520
2.559
2.598
2.638
2.677
2.717
2.756
2.795
2.835
2.874
2.913
2.953
2.992
3.031
3.071
3.110
3.150
3.189
3.228
3.268
3.307
3.346
3.386
3.425
3.465
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.098
Cross
Section
Tolerance
+/-
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
89.00
90.00
91.00
92.00
93.00
94.00
95.00
96.00
97.00
98.00
99.00
100.00
101.00
102.00
103.00
104.00
105.00
106.00
107.00
108.00
109.00
110.00
111.00
112.00
113.00
114.00
115.00
116.00
117.00
118.00
119.00
120.00
121.00
122.00
123.00
124.00
125.00
126.00
127.00
128.00
129.00
130.00
131.00
132.00
133.00
134.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
2.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-189
206-190
206-191
206-192
206-193
206-194
206-195
206-196
206-197
206-198
206-199
206-200
206-201
206-202
206-203
206-204
206-205
206-206
206-207
206-208
206-209
206-210
206-211
206-212
206-213
206-214
206-215
206-216
206-217
206-218
206-219
206-220
206-221
206-222
206-223
206-224
206-225
206-226
206-227
206-228
206-229
206-230
206-231
206-232
206-233
206-234
-----------------------------------------------
Page 42
Internal
Diameter
(inches)
3.504
3.543
3.583
3.622
3.661
3.701
3.740
3.780
3.819
3.858
3.898
3.937
3.976
4.016
4.055
4.094
4.134
4.173
4.213
4.252
4.291
4.331
4.370
4.409
4.449
4.488
4.528
4.567
4.606
4.646
4.685
4.724
4.764
4.803
4.843
4.882
4.921
4.961
5.000
5.039
5.079
5.118
5.157
5.197
5.236
5.276
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.098
Cross
Section
Tolerance
+/-
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
135.00
136.00
137.00
138.00
139.00
140.00
141.00
142.00
143.00
144.00
145.00
146.00
147.00
148.00
149.00
150.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
16.00
17.00
18.00
19.00
20.00
21.00
22.00
23.00
24.00
25.00
26.00
27.00
28.00
29.00
30.00
31.00
32.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.30
0.30
2.50
3.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-235
206-236
206-237
206-238
206-239
206-240
206-241
206-242
206-243
206-244
206-245
206-246
206-247
206-248
206-249
206-250
206-303
206-304
206-305
206-306
206-307
206-308
206-309
206-310
206-311
206-312
206-313
206-314
206-315
206-316
206-317
206-318
206-319
206-320
206-321
206-322
206-323
206-324
206-325
206-326
206-327
206-328
206-329
206-330
206-331
206-332
-----------------------------------------------
Page 43
Internal
Diameter
(inches)
5.315
5.354
5.394
5.433
5.472
5.512
5.551
5.591
5.630
5.669
5.709
5.748
5.787
5.827
5.866
5.906
0.118
0.157
0.197
0.236
0.276
0.315
0.354
0.394
0.433
0.472
0.512
0.551
0.591
0.630
0.669
0.709
0.748
0.787
0.827
0.866
0.906
0.945
0.984
1.024
1.063
1.102
1.142
1.181
1.220
1.260
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.010
0.010
0.010
0.010
0.010
0.012
0.012
Cross
Section
Tolerance
+/-
0.098
0.003
0.118
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
33.00
34.00
35.00
36.00
37.00
38.00
39.00
40.00
41.00
42.00
43.00
44.00
45.00
46.00
47.00
48.00
49.00
50.00
51.00
52.00
53.00
54.00
55.00
56.00
57.00
58.00
59.00
60.00
61.00
62.00
63.00
64.00
65.00
66.00
67.00
68.00
69.00
70.00
71.00
72.00
73.00
74.00
75.00
76.00
77.00
78.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
3.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-333
206-334
206-335
206-336
206-337
206-338
206-339
206-340
206-341
206-342
206-343
206-344
206-345
206-346
206-347
206-348
206-349
206-350
206-351
206-352
206-353
206-354
206-355
206-356
206-357
206-358
206-359
206-360
206-361
206-362
206-363
206-364
206-365
206-366
206-367
206-368
206-369
206-370
206-371
206-372
206-373
206-374
206-375
206-376
206-377
206-378
-----------------------------------------------
Page 44
Internal
Diameter
(inches)
1.299
1.339
1.378
1.417
1.457
1.496
1.535
1.575
1.614
1.654
1.693
1.732
1.772
1.811
1.850
1.890
1.929
1.969
2.008
2.047
2.087
2.126
2.165
2.205
2.244
2.283
2.323
2.362
2.402
2.441
2.480
2.520
2.559
2.598
2.638
2.677
2.717
2.756
2.795
2.835
2.874
2.913
2.953
2.992
3.031
3.071
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.118
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
79.00
80.00
81.00
82.00
83.00
84.00
85.00
86.00
87.00
88.00
89.00
90.00
91.00
92.00
93.00
94.00
95.00
96.00
97.00
98.00
99.00
100.00
101.00
102.00
103.00
104.00
105.00
106.00
107.00
108.00
109.00
110.00
111.00
112.00
113.00
114.00
115.00
116.00
117.00
118.00
119.00
120.00
121.00
122.00
123.00
124.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.40
0.40
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
3.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-379
206-380
206-381
206-382
206-383
206-384
206-385
206-386
206-387
206-388
206-389
206-390
206-391
206-392
206-393
206-394
206-395
206-396
206-397
206-398
206-399
206-400
206-401
206-402
206-403
206-404
206-405
206-406
206-407
206-408
206-409
206-410
206-411
206-412
206-413
206-414
206-415
206-416
206-417
206-418
206-419
206-420
206-421
206-422
206-423
206-424
-----------------------------------------------
Page 45
Internal
Diameter
(inches)
3.110
3.150
3.189
3.228
3.268
3.307
3.346
3.386
3.425
3.465
3.504
3.543
3.583
3.622
3.661
3.701
3.740
3.780
3.819
3.858
3.898
3.937
3.976
4.016
4.055
4.094
4.134
4.173
4.213
4.252
4.291
4.331
4.370
4.409
4.449
4.488
4.528
4.567
4.606
4.646
4.685
4.724
4.764
4.803
4.843
4.882
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.016
0.016
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.024
0.024
0.024
0.024
0.118
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
125.00
126.00
127.00
128.00
129.00
130.00
131.00
132.00
133.00
134.00
135.00
136.00
137.00
138.00
139.00
140.00
141.00
142.00
143.00
144.00
145.00
146.00
147.00
148.00
149.00
150.00
151.00
152.00
153.00
154.00
155.00
156.00
157.00
158.00
159.00
160.00
161.00
162.00
163.00
164.00
165.00
166.00
167.00
168.00
169.00
170.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.50
0.50
0.50
0.50
0.50
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
3.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-425
206-426
206-427
206-428
206-429
206-430
206-431
206-432
206-433
206-434
206-435
206-436
206-437
206-438
206-439
206-440
206-441
206-442
206-443
206-444
206-445
206-446
206-447
206-448
206-449
206-450
206-451
206-452
206-453
206-454
206-455
206-456
206-457
206-458
206-459
206-460
206-461
206-462
206-463
206-464
206-465
206-466
206-467
206-468
206-469
206-470
-----------------------------------------------
Page 46
Internal
Diameter
(inches)
4.921
4.961
5.000
5.039
5.079
5.118
5.157
5.197
5.236
5.276
5.315
5.354
5.394
5.433
5.472
5.512
5.551
5.591
5.630
5.669
5.709
5.748
5.787
5.827
5.866
5.906
5.945
5.984
6.024
6.063
6.102
6.142
6.181
6.220
6.260
6.299
6.339
6.378
6.417
6.457
6.496
6.535
6.575
6.614
6.654
6.693
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.118
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
171.00
172.00
173.00
174.00
175.00
176.00
177.00
178.00
179.00
180.00
181.00
182.00
183.00
184.00
185.00
186.00
187.00
188.00
189.00
190.00
191.00
192.00
193.00
194.00
195.00
196.00
197.00
198.00
199.00
200.00
201.00
202.00
203.00
204.00
205.00
206.00
207.00
208.00
209.00
210.00
211.00
212.00
213.00
214.00
215.00
216.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
3.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-471
206-472
206-473
206-474
206-475
206-476
206-477
206-478
206-479
206-480
206-481
206-482
206-483
206-484
206-485
206-486
206-487
206-488
206-489
206-490
206-491
206-492
206-493
206-494
206-495
206-496
206-497
206-498
206-499
206-500
206-501
206-502
206-503
206-504
206-505
206-506
206-507
206-508
206-509
206-510
206-511
206-512
206-513
206-514
206-515
206-516
-----------------------------------------------
Page 47
Internal
Diameter
(inches)
6.732
6.772
6.811
6.850
6.890
6.929
6.969
7.008
7.047
7.087
7.126
7.165
7.205
7.244
7.283
7.323
7.362
7.402
7.441
7.480
7.520
7.559
7.598
7.638
7.677
7.717
7.756
7.795
7.835
7.874
7.913
7.953
7.992
8.031
8.071
8.110
8.150
8.189
8.228
8.268
8.307
8.346
8.386
8.425
8.465
8.504
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.118
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
217.00
218.00
219.00
220.00
221.00
222.00
223.00
224.00
225.00
226.00
227.00
228.00
229.00
230.00
231.00
232.00
233.00
234.00
235.00
236.00
237.00
238.00
239.00
240.00
241.00
242.00
243.00
244.00
245.00
246.00
247.00
248.00
249.00
250.00
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
16.00
17.00
18.00
19.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.15
0.15
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.25
3.00
3.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-517
206-518
206-519
206-520
206-521
206-522
206-523
206-524
206-525
206-526
206-527
206-528
206-529
206-530
206-531
206-532
206-533
206-534
206-535
206-536
206-537
206-538
206-539
206-540
206-541
206-542
206-543
206-544
206-545
206-546
206-547
206-548
206-549
206-550
206-558
206-559
206-560
206-561
206-562
206-563
206-564
206-565
206-566
206-567
206-568
206-569
-----------------------------------------------
Page 48
Internal
Diameter
(inches)
8.543
8.583
8.622
8.661
8.701
8.740
8.780
8.819
8.858
8.898
8.937
8.976
9.016
9.055
9.094
9.134
9.173
9.213
9.252
9.291
9.331
9.370
9.409
9.449
9.488
9.528
9.567
9.606
9.646
9.685
9.724
9.764
9.803
9.843
0.315
0.354
0.394
0.433
0.472
0.512
0.551
0.591
0.630
0.669
0.709
0.748
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.006
0.006
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.010
Cross
Section
Tolerance
+/-
0.118
0.004
0.138
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
20.00
21.00
22.00
23.00
24.00
25.00
26.00
27.00
28.00
29.00
30.00
31.00
32.00
33.00
34.00
35.00
36.00
37.00
38.00
39.00
40.00
41.00
42.00
43.00
44.00
45.00
46.00
47.00
48.00
49.00
50.00
51.00
52.00
53.00
54.00
55.00
56.00
57.00
58.00
59.00
60.00
61.00
62.00
63.00
64.00
65.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
3.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-570
206-571
206-572
206-573
206-574
206-575
206-576
206-577
206-578
206-579
206-580
206-581
206-582
206-583
206-584
206-585
206-586
206-587
206-588
206-589
206-590
206-591
206-592
206-593
206-594
206-595
206-596
206-597
206-598
206-599
206-600
206-601
206-602
206-603
206-604
206-605
206-606
206-607
206-608
206-609
206-610
206-611
206-612
206-613
206-614
206-615
-----------------------------------------------
Page 49
Internal
Diameter
(inches)
0.787
0.827
0.866
0.906
0.945
0.984
1.024
1.063
1.102
1.142
1.181
1.220
1.260
1.299
1.339
1.378
1.417
1.457
1.496
1.535
1.575
1.614
1.654
1.693
1.732
1.772
1.811
1.850
1.890
1.929
1.969
2.008
2.047
2.087
2.126
2.165
2.205
2.244
2.283
2.323
2.362
2.402
2.441
2.480
2.520
2.559
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.138
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
66.00
67.00
68.00
69.00
70.00
71.00
72.00
73.00
74.00
75.00
76.00
77.00
78.00
79.00
80.00
81.00
82.00
83.00
84.00
85.00
86.00
87.00
88.00
89.00
90.00
91.00
92.00
93.00
94.00
95.00
96.00
97.00
98.00
99.00
100.00
101.00
102.00
103.00
104.00
105.00
106.00
107.00
108.00
109.00
110.00
111.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.40
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
3.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-616
206-617
206-618
206-619
206-620
206-621
206-622
206-623
206-624
206-625
206-626
206-627
206-628
206-629
206-630
206-631
206-632
206-633
206-634
206-635
206-636
206-637
206-638
206-639
206-640
206-641
206-642
206-643
206-644
206-645
206-646
206-647
206-648
206-649
206-650
206-651
206-652
206-653
206-654
206-655
206-656
206-657
206-658
206-659
206-660
206-661
-----------------------------------------------
Page 50
Internal
Diameter
(inches)
2.598
2.638
2.677
2.717
2.756
2.795
2.835
2.874
2.913
2.953
2.992
3.031
3.071
3.110
3.150
3.189
3.228
3.268
3.307
3.346
3.386
3.425
3.465
3.504
3.543
3.583
3.622
3.661
3.701
3.740
3.780
3.819
3.858
3.898
3.937
3.976
4.016
4.055
4.094
4.134
4.173
4.213
4.252
4.291
4.331
4.370
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.016
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.138
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
112.00
113.00
114.00
115.00
116.00
117.00
118.00
119.00
120.00
121.00
122.00
123.00
124.00
125.00
126.00
127.00
128.00
129.00
130.00
131.00
132.00
133.00
134.00
135.00
136.00
137.00
138.00
139.00
140.00
141.00
142.00
143.00
144.00
145.00
146.00
147.00
148.00
149.00
150.00
151.00
152.00
153.00
154.00
155.00
156.00
157.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
3.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-662
206-663
206-664
206-665
206-666
206-667
206-668
206-669
206-670
206-671
206-672
206-673
206-674
206-675
206-676
206-677
206-678
206-679
206-680
206-681
206-682
206-683
206-684
206-685
206-686
206-687
206-688
206-689
206-690
206-691
206-692
206-693
206-694
206-695
206-696
206-697
206-698
206-699
206-700
206-701
206-702
206-703
206-704
206-705
206-706
206-707
-----------------------------------------------
Page 51
Internal
Diameter
(inches)
4.409
4.449
4.488
4.528
4.567
4.606
4.646
4.685
4.724
4.764
4.803
4.843
4.882
4.921
4.961
5.000
5.039
5.079
5.118
5.157
5.197
5.236
5.276
5.315
5.354
5.394
5.433
5.472
5.512
5.551
5.591
5.630
5.669
5.709
5.748
5.787
5.827
5.866
5.906
5.945
5.984
6.024
6.063
6.102
6.142
6.181
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.138
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
158.00
159.00
160.00
161.00
162.00
163.00
164.00
165.00
166.00
167.00
168.00
169.00
170.00
171.00
172.00
173.00
174.00
175.00
176.00
177.00
178.00
179.00
180.00
181.00
182.00
183.00
184.00
185.00
186.00
187.00
188.00
189.00
190.00
191.00
192.00
193.00
194.00
195.00
196.00
197.00
198.00
199.00
200.00
201.00
202.00
203.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
3.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-708
206-709
206-710
206-711
206-712
206-713
206-714
206-715
206-716
206-717
206-718
206-719
206-720
206-721
206-722
206-723
206-724
206-725
206-726
206-727
206-728
206-729
206-730
206-731
206-732
206-733
206-734
206-735
206-736
206-737
206-738
206-739
206-740
206-741
206-742
206-743
206-744
206-745
206-746
206-747
206-748
206-749
206-750
206-751
206-752
206-753
-----------------------------------------------
Page 52
Internal
Diameter
(inches)
6.220
6.260
6.299
6.339
6.378
6.417
6.457
6.496
6.535
6.575
6.614
6.654
6.693
6.732
6.772
6.811
6.850
6.890
6.929
6.969
7.008
7.047
7.087
7.126
7.165
7.205
7.244
7.283
7.323
7.362
7.402
7.441
7.480
7.520
7.559
7.598
7.638
7.677
7.717
7.756
7.795
7.835
7.874
7.913
7.953
7.992
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.024
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.138
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
204.00
205.00
206.00
207.00
208.00
209.00
210.00
211.00
212.00
213.00
214.00
215.00
216.00
217.00
218.00
219.00
220.00
221.00
222.00
223.00
224.00
225.00
226.00
227.00
228.00
229.00
230.00
231.00
232.00
233.00
234.00
235.00
236.00
237.00
238.00
239.00
240.00
241.00
242.00
243.00
244.00
245.00
246.00
247.00
248.00
249.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
3.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-754
206-755
206-756
206-757
206-758
206-759
206-760
206-761
206-762
206-763
206-764
206-765
206-766
206-767
206-768
206-769
206-770
206-771
206-772
206-773
206-774
206-775
206-776
206-777
206-778
206-779
206-780
206-781
206-782
206-783
206-784
206-785
206-786
206-787
206-788
206-789
206-790
206-791
206-792
206-793
206-794
206-795
206-796
206-797
206-798
206-799
-----------------------------------------------
Page 53
Internal
Diameter
(inches)
8.031
8.071
8.110
8.150
8.189
8.228
8.268
8.307
8.346
8.386
8.425
8.465
8.504
8.543
8.583
8.622
8.661
8.701
8.740
8.780
8.819
8.858
8.898
8.937
8.976
9.016
9.055
9.094
9.134
9.173
9.213
9.252
9.291
9.331
9.370
9.409
9.449
9.488
9.528
9.567
9.606
9.646
9.685
9.724
9.764
9.803
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.138
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
250.00
251.00
252.00
253.00
254.00
255.00
256.00
257.00
258.00
259.00
260.00
261.00
262.00
263.00
264.00
265.00
266.00
267.00
268.00
269.00
270.00
271.00
272.00
273.00
274.00
275.00
276.00
277.00
278.00
279.00
280.00
281.00
282.00
283.00
284.00
285.00
286.00
287.00
288.00
289.00
290.00
291.00
292.00
293.00
294.00
295.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.80
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
3.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-800
206-801
206-802
206-803
206-804
206-805
206-806
206-807
206-808
206-809
206-810
206-811
206-812
206-813
206-814
206-815
206-816
206-817
206-818
206-819
206-820
206-821
206-822
206-823
206-824
206-825
206-826
206-827
206-828
206-829
206-830
206-831
206-832
206-833
206-834
206-835
206-836
206-837
206-838
206-839
206-840
206-841
206-842
206-843
206-844
206-845
-----------------------------------------------
Page 54
Internal
Diameter
(inches)
9.843
9.882
9.921
9.961
10.000
10.039
10.079
10.118
10.157
10.197
10.236
10.276
10.315
10.354
10.394
10.433
10.472
10.512
10.551
10.591
10.630
10.669
10.709
10.748
10.787
10.827
10.866
10.906
10.945
10.984
11.024
11.063
11.102
11.142
11.181
11.220
11.260
11.299
11.339
11.378
11.417
11.457
11.496
11.535
11.575
11.614
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.031
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.039
0.138
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
296.00
297.00
298.00
299.00
300.00
301.00
302.00
303.00
304.00
305.00
306.00
307.00
308.00
309.00
310.00
311.00
312.00
313.00
314.00
315.00
316.00
317.00
318.00
319.00
320.00
321.00
322.00
323.00
324.00
325.00
326.00
327.00
328.00
329.00
330.00
331.00
332.00
333.00
334.00
335.00
336.00
337.00
338.00
339.00
340.00
341.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.00
1.00
1.00
1.00
1.00
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
3.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-846
206-847
206-848
206-849
206-850
206-851
206-852
206-853
206-854
206-855
206-856
206-857
206-858
206-859
206-860
206-861
206-862
206-863
206-864
206-865
206-866
206-867
206-868
206-869
206-870
206-871
206-872
206-873
206-874
206-875
206-876
206-877
206-878
206-879
206-880
206-881
206-882
206-883
206-884
206-885
206-886
206-887
206-888
206-889
206-890
206-891
-----------------------------------------------
Page 55
Internal
Diameter
(inches)
11.654
11.693
11.732
11.772
11.811
11.850
11.890
11.929
11.969
12.008
12.047
12.087
12.126
12.165
12.205
12.244
12.283
12.323
12.362
12.402
12.441
12.480
12.520
12.559
12.598
12.638
12.677
12.717
12.756
12.795
12.835
12.874
12.913
12.953
12.992
13.031
13.071
13.110
13.150
13.189
13.228
13.268
13.307
13.346
13.386
13.425
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.039
0.039
0.039
0.039
0.039
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.138
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
342.00
343.00
344.00
345.00
346.00
347.00
348.00
349.00
350.00
351.00
352.00
353.00
354.00
355.00
356.00
357.00
358.00
359.00
360.00
361.00
362.00
363.00.
364.00
365.00
366.00
367.00
368.00
369.00
370.00
371.00
372.00
373.00
374.00
375.00
376.00
377.00
378.00
379.00
380.00
381.00
382.00
383.00
384.00
385.00
386.00
387.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
3.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-892
206-893
206-894
206-895
206-896
206-897
206-898
206-899
206-900
206-901
206-902
206-903
206-904
206-905
206-906
206-907
206-908
206-909
206-910
206-911
206-912
206-913
206-914
206-915
206-916
206-917
206-918
206-919
206-920
206-921
206-922
206-923
206-924
206-925
206-926
206-927
206-928
206-929
206-930
206-931
206-932
206-933
206-934
206-935
206-936
206-937
-----------------------------------------------
Page 56
Internal
Diameter
(inches)
13.465
13.504
13.543
13.583
13.622
13.661
13.701
13.740
13.780
13.819
13.858
13.898
13.937
13.976
14.016
14.055
14.094
14.134
14.173
14.213
14.252
14.291
14.331
14.370
14.409
14.449
14.488
14.528
14.567
14.606
14.646
14.685
14.724
14.764
14.803
14.843
14.882
14.921
14.961
15.000
15.039
15.079
15.118
15.157
15.197
15.236
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.138
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
388.00
389.00
390.00
391.00
392.00
393.00
394.00
395.00
396.00
397.00
398.00
399.00
400.00
401.00
402.00
403.00
404.00
405.00
406.00
407.00
408.00
409.00
410.00
411.00
412.00
413.00
414.00
415.00
416.00
417.00
418.00
419.00
420.00
421.00
422.00
423.00
424.00
425.00
426.00
427.00
428.00
429.00
430.00
431.00
432.00
433.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
3.50
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
Alternative
Size Reference
206-938
206-939
206-940
206-941
206-942
206-943
206-944
206-945
206-946
206-947
206-948
206-949
206-950
206-951
206-952
206-953
206-954
206-955
206-956
206-957
206-958
206-959
206-960
206-961
206-962
206-963
206-964
206-965
206-966
206-967
206-968
206-969
206-970
206-971
206-972
206-973
206-974
206-975
206-976
206-977
206-978
206-979
206-980
206-981
206-982
206-983
-----------------------------------------------
Page 57
Internal
Diameter
(inches)
15.276
15.315
15.354
15.394
15.433
15.472
15.512
15.551
15.591
15.630
15.669
15.709
15.748
15.787
15.827
15.866
15.906
15.945
15.984
16.024
16.063
16.102
16.142
16.181
16.220
16.260
16.299
16.339
16.378
16.417
16.457
16.496
16.535
16.575
16.614
16.654
16.693
16.732
16.772
16.811
16.850
16.890
16.929
16.969
17.008
17.047
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.138
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
434.00
435.00
436.00
437.00
438.00
439.00
440.00
1.80
2.00
2.24
2.50
2.80
3.15
3.55
3.75
4.00
4.50
4.87
5.00
5.15
5.30
5.60
6.00
6.30
6.70
6.90
7.10
7.50
8.00
8.50
8.75
9.00
9.50
10.00
10.60
11.20
11.80
12.50
13.20
14.00
15.00
16.00
17.00
18.00
19.00
20.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/2.00
2.00
2.00
2.00
2.00
2.00
2.00
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.14
0.14
0.14
0.14
0.15
0.15
0.15
0.15
0.15
0.16
0.16
0.17
0.17
0.17
0.18
0.18
0.19
0.20
0.20
0.21
0.21
3.50
1.80
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
0.08
Precision Polymer Engineering Ltd
206-984
206-985
206-986
206-987
206-988
206-989
206-990
208-501
208-502
208-503
208-504
208-505
208-506
208-507
208-508
208-509
208-510
208-511
208-512
208-513
208-514
208-515
208-516
208-517
208-518
208-519
208-520
208-521
208-522
208-523
208-524
208-525
208-526
208-527
208-528
208-529
208-530
208-531
208-532
208-533
208-534
208-535
208-536
208-537
208-538
208-539
Alternative
Size Reference
-------ISO 3601 -A0018
ISO 3601 -A0020
ISO 3601 -A0024
ISO 3601 -A0025
ISO 3601 -A0028
ISO 3601 -A0032
ISO 3601 -A0036
ISO 3601 -A0038
ISO 3601 -A0040
ISO 3601 -A0045
ISO 3601 -A0049
ISO 3601 -A0050
ISO 3601 -A0052
ISO 3601 -A0053
ISO 3601 -A0056
ISO 3601 -A0060
ISO 3601 -A0063
ISO 3601 -A0067
ISO 3601 -A0069
ISO 3601 -A0071
ISO 3601 -A0075
ISO 3601 -A0080
ISO 3601 -A0085
ISO 3601 -A0088
ISO 3601 -A0090
ISO 3601 -A0095
ISO 3601 -A0100
ISO 3601 -A0106
ISO 3601 -A0112
ISO 3601 -A0118
ISO 3601 -A0250
ISO 3601 -A0132
ISO 3601 -A0140
ISO 3601 -A0150
ISO 3601 -A0160
ISO 3601 -A0170
ISO 3601 -A0180
ISO 3601 -A0190
ISO 3601 -A0200
Page 58
Internal
Diameter
(inches)
17.087
17.126
17.165
17.205
17.244
17.283
17.323
0.071
0.079
0.088
0.098
0.110
0.124
0.140
0.140
0.157
0.177
0.192
0.197
0.205
0.209
0.220
0.236
0.248
0.264
0.272
0.280
0.295
0.315
0.335
0.344
0.354
0.374
0.394
0.441
0.471
0.465
0.492
0.520
0.551
0.591
0.630
0.669
0.709
0.748
0.787
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.079
0.079
0.079
0.079
0.079
0.079
0.079
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.007
0.007
0.007
0.007
0.007
0.007
0.008
0.008
0.008
0.008
Cross
Section
Tolerance
+/-
0.138
0.004
0.071
0.003
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
21.20
22.40
23.60
25.00
25.80
26.50
28.00
30.00
31.50
32.50
33.50
34.50
35.50
36.50
37.50
38.70
40.00
41.20
42.50
43.70
45.00
47.50
50.00
53.00
56.00
60.00
63.00
67.00
71.00
75.00
80.00
85.00
90.00
95.00
100.00
106.00
112.00
118.00
125.00
4.50
5.30
6.00
6.90
8.00
9.00
9.50
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.22
0.23
0.24
0.24
0.25
0.25
0.26
0.26
0.28
0.29
0.29
0.30
0.31
0.31
0.32
0.32
0.33
0.34
0.35
0.35
0.36
0.38
0.39
0.41
0.42
0.45
0.46
0.49
0.51
0.53
0.56
0.59
0.62
0.64
0.67
0.71
0.74
0.77
0.81
0.13
0.13
0.13
0.14
0.14
0.15
0.15
1.80
2.65
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.08
0.09
Precision Polymer Engineering Ltd
208-540
208-541
208-542
208-543
208-544
208-545
208-546
208-547
208-548
208-549
208-550
208-551
208-552
208-553
208-554
208-555
208-556
208-557
208-558
208-559
208-560
208-561
208-562
208-563
208-564
208-565
208-566
208-567
208-568
208-569
208-570
208-571
208-572
208-573
208-574
208-575
208-576
208-577
208-578
208-601
208-602
208-603
208-604
208-605
208-606
208-607
Alternative
Size Reference
ISO 3601 -A0212
ISO 3601 -A0224
ISO 3601 -A0236
ISO 3601 -A0250
ISO 3601 -A0258
ISO 3601 -A0265
ISO 3601 -A0280
ISO 3601 -A0300
ISO 3601 -A0315
ISO 3601 -A0325
ISO 3601 -A0335
ISO 3601 -A0345
ISO 3601 -A0355
ISO 3601 -A0365
ISO 3601 -A0375
ISO 3601 -A0380
ISO 3601 -A0400
ISO 3601 -A0412
ISO 3601 -A0425
ISO 3601 -A0437
ISO 3601 -A0450
ISO 3601 -A0475
ISO 3601 -A0500
ISO 3601 -A0530
ISO 3601 -A0560
ISO 3601 -A0600
ISO 3601 -A0630
ISO 3601 -A0670
ISO 3601 -A0710
ISO 3601 -A0750
ISO 3601 -A0800
ISO 3601 -A0850
ISO 3601 -A0900
ISO 3601 -A0950
ISO 3601 -A1000
ISO 3601 -A1060
ISO 3601 -A1120
ISO 3601 -A1180
ISO 3601 -A1250
ISO 3601 -B0045
ISO 3601 -B0053
ISO 3601 -B0060
ISO 3601 -B0069
ISO 3601 -B0080
ISO 3601 -B0090
ISO 3601 -B0095
Page 59
Internal
Diameter
(inches)
0.835
0.882
0.929
0.984
1.016
1.043
1.102
1.181
1.240
1.280
1.319
1.358
1.398
1.437
1.476
1.524
1.575
1.622
1.673
1.720
1.772
1.870
1.969
2.087
2.205
2.362
2.480
2.638
2.795
2.953
3.150
3.460
3.543
3.740
3.937
4.173
4.409
4.646
4.921
0.177
0.209
0.236
0.272
0.315
0.354
0.374
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.009
0.009
0.009
0.009
0.010
0.010
0.010
0.010
0.011
0.011
0.011
0.012
0.012
0.012
0.013
0.013
0.013
0.013
0.014
0.014
0.014
0.015
0.015
0.016
0.017
0.018
0.018
0.019
0.020
0.021
0.022
0.023
0.024
0.025
0.026
0.028
0.029
0.030
0.032
0.005
0.005
0.005
0.006
0.006
0.006
0.006
Cross
Section
Tolerance
+/-
0.071
0.003
0.104
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
10.00
10.60
11.20
11.80
12.50
13.20
14.00
15.00
16.00
17.00
18.00
19.00
20.00
21.20
22.40
23.60
25.00
25.80
26.50
28.00
30.00
31.50
32.50
33.50
34.50
35.50
36.50
37.50
38.70
40.00
41.20
42.50
43.70
45.00
46.20
47.50
48.70
50.00
51.50
53.00
54.50
56.00
58.00
60.00
61.50
63.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.15
0.16
0.16
0.17
0.17
0.17
0.18
0.18
0.19
0.20
0.20
0.21
0.21
0.22
0.23
0.24
0.24
0.25
0.25
0.26
0.27
0.28
0.29
0.29
0.30
0.31
0.31
0.32
0.32
0.33
0.34
0.35
0.35
0.36
0.37
0.38
0.38
0.39
0.40
0.41
0.42
0.42
0.44
0.45
0.45
0.46
2.65
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.09
Precision Polymer Engineering Ltd
208-608
208-609
208-610
208-611
208-612
208-613
208-614
208-615
208-616
208-617
208-618
208-619
208-620
208-621
208-622
208-623
208-624
208-625
208-626
208-627
208-628
208-629
208-630
208-631
208-632
208-633
208-634
208-635
208-636
208-637
208-638
208-639
208-640
208-641
208-642
208-643
208-644
208-645
208-646
208-647
208-648
208-649
208-650
208-651
208-652
208-653
Alternative
Size Reference
ISO 3601 -B0100
ISO 3601 -B0106
ISO 3601 -B0112
ISO 3601 -B0118
ISO 3601 -B0125
ISO 3601 -B0132
ISO 3601 -B0140
ISO 3601 -B0150
ISO 3601 -B0160
ISO 3601 -B0170
ISO 3601 -B0180
ISO 3601 -B0190
ISO 3601 -B0200
ISO 3601 -B0212
ISO 3601 -B0224
ISO 3601 -B0236
ISO 3601 -B0250
ISO 3601 -B0258
ISO 3601 -B0265
ISO 3601 -B0280
ISO 3601 -B0300
ISO 3601 -B0315
ISO 3601 -B0325
ISO 3601 -B0335
ISO 3601 -B0345
ISO 3601 -B0355
ISO 3601 -B0365
ISO 3601 -B0375
ISO 3601 -B0387
ISO 3601 -B0400
ISO 3601 -B0412
ISO 3601 -B0425
ISO 3601 -B0437
ISO 3601 -B0450
ISO 3601 -B0462
ISO 3601 -B0475
ISO 3601 -B0487
ISO 3601 -B0500
ISO 3601 -B0515
ISO 3601 -B0530
ISO 3601 -B0545
ISO 3601 -B0560
ISO 3601 -B0580
ISO 3601 -B0600
ISO 3601 -B0615
ISO 3601 -B0630
Page 60
Internal
Diameter
(inches)
0.394
0.417
0.441
0.465
0.492
0.520
0.551
0.591
0.630
0.669
0.709
0.748
0.787
0.835
0.882
0.929
0.984
1.016
1.043
1.102
1.181
1.240
1.280
1.319
1.358
1.398
1.437
1.476
1.524
1.575
1.622
1.673
1.720
1.772
1.819
1.870
1.917
1.969
2.028
2.087
2.146
2.205
2.283
2.362
2.421
2.480
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.006
0.006
0.006
0.007
0.007
0.007
0.007
0.007
0.007
0.008
0.008
0.008
0.008
0.009
0.009
0.009
0.009
0.010
0.010
0.010
0.011
0.011
0.011
0.011
0.012
0.012
0.012
0.013
0.013
0.013
0.013
0.014
0.014
0.014
0.015
0.015
0.015
0.015
0.016
0.016
0.017
0.017
0.017
0.018
0.018
0.018
0.104
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
65.00
67.00
69.00
71.00
73.00
75.00
80.00
85.00
90.00
95.00
100.00
106.00
112.00
118.00
125.00
132.00
140.00
150.00
160.00
170.00
180.00
190.00
200.00
212.00
224.00
236.00
250.00
14.00
15.00
16.00
17.00
18.00
19.00
20.00
21.20
22.40
23.60
25.00
25.80
26.50
28.00
30.00
31.50
32.50
33.50
34.50
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.48
0.49
0.50
0.51
0.52
0.53
0.56
0.59
0.62
0.64
0.67
0.71
0.74
0.77
0.81
0.85
0.89
0.95
1.00
1.06
1.11
1.17
1.22
1.29
1.35
1.42
1.49
0.18
0.18
0.19
0.20
0.20
0.21
0.21
0.22
0.23
0.24
0.24
0.25
0.25
0.26
0.27
0.28
0.29
0.29
0.30
2.65
3.55
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.09
0.10
Precision Polymer Engineering Ltd
208-654
208-655
208-656
208-657
208-658
208-659
208-660
208-661
208-662
208-663
208-664
208-665
208-666
208-667
208-668
208-669
208-670
208-671
208-672
208-673
208-674
208-675
208-676
208-677
208-678
208-679
208-680
208-701
208-702
208-703
208-704
208-705
208-706
208-707
208-708
208-709
208-710
208-711
208-712
208-713
208-714
208-715
208-716
208-717
208-718
208-719
Alternative
Size Reference
ISO 3601 -B0650
ISO 3601 -B0670
ISO 3601 -B0690
ISO 3601 -B0710
ISO 3601 -B0730
ISO 3601 -B0750
ISO 3601 -B0800
ISO 3601 -B0850
ISO 3601 -B0900
ISO 3601 -B0950
ISO 3601 -B1000
ISO 3601 -B1060
ISO 3601 -B1120
ISO 3601 -B1180
ISO 3601 -B1250
ISO 3601 -B1320
ISO 3601 -B1400
ISO 3601 -B1500
ISO 3601 -B1600
ISO 3601 -B1700
ISO 3601 -B1800
ISO 3601 -B1900
ISO 3601 -B2000
ISO 3601 -B2120
ISO 3601 -B2240
ISO 3601 -B2360
ISO 3601 -B2500
ISO 3601 -C0140
ISO 3601 -C0150
ISO 3601 -C0160
ISO 3601 -C0170
ISO 3601 -C0180
ISO 3601 -C0190
ISO 3601 -C0200
ISO 3601 -C0212
ISO 3601 -C0224
ISO 3601 -C0236
ISO 3601 -C0250
ISO 3601 -C0258
ISO 3601 -C0265
ISO 3601 -C0280
ISO 3601 -C0300
ISO 3601 -C0315
ISO 3601 -C0325
ISO 3601 -C0335
ISO 3601 -C0345
Page 61
Internal
Diameter
(inches)
2.559
2.638
2.717
2.795
2.874
2.953
3.150
3.346
3.543
3.740
3.937
4.173
4.409
4.646
4.921
5.197
5.512
5.906
6.299
6.930
7.087
7.480
7.874
8.346
8.819
9.291
9.843
0.551
0.591
0.630
0.669
0.709
0.748
0.787
0.835
0.882
0.929
0.984
1.016
1.043
1.102
1.181
1.240
1.280
1.319
1.358
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.019
0.019
0.020
0.020
0.020
0.021
0.022
0.023
0.024
0.025
0.026
0.028
0.029
0.030
0.032
0.033
0.035
0.037
0.039
0.042
0.044
0.046
0.048
0.051
0.053
0.056
0.059
0.007
0.007
0.007
0.008
0.008
0.008
0.008
0.009
0.009
0.009
0.009
0.010
0.010
0.010
0.011
0.011
0.011
0.011
0.012
Cross
Section
Tolerance
+/-
0.104
0.004
0.14
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
35.50
36.50
37.50
38.70
40.00
41.20
42.50
43.70
45.00
46.20
47.50
48.70
50.00
51.50
53.00
54.50
56.00
58.00
60.00
61.50
63.00
65.00
67.00
69.00
71.00
73.00
75.00
77.50
80.00
82.50
85.00
87.50
90.00
92.50
95.00
97.50
100.00
103.00
106.00
109.00
112.00
115.00
118.00
122.00
125.00
128.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.31
0.31
0.32
0.32
0.33
0.34
0.35
0.35
0.36
0.37
0.38
0.38
0.39
0.40
0.41
0.42
0.42
0.44
0.45
0.45
0.46
0.48
0.49
0.50
0.51
0.52
0.53
0.55
0.56
0.57
0.59
0.60
0.62
0.63
0.64
0.66
0.67
0.69
0.71
0.72
0.74
0.76
0.77
0.80
0.81
0.83
3.55
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
Precision Polymer Engineering Ltd
208-720
208-721
208-722
208-723
208-724
208-725
208-726
208-727
208-728
208-729
208-730
208-731
208-732
208-733
208-734
208-735
208-736
208-737
208-738
208-739
208-740
208-741
208-742
208-743
208-744
208-745
208-746
208-747
208-748
208-749
208-750
208-751
208-752
208-753
208-754
208-755
208-756
208-757
208-758
208-759
208-760
208-761
208-762
208-763
208-764
208-765
Alternative
Size Reference
ISO 3601 -C0355
ISO 3601 -C0365
ISO 3601 -C0375
ISO 3601 -C0387
ISO 3601 -C0400
ISO 3601 -C0412
ISO 3601 -C0425
ISO 3601 -C0437
ISO 3601 -C0450
ISO 3601 -C0462
ISO 3601 -C0475
ISO 3601 -C0487
ISO 3601 -C0500
ISO 3601 -C0515
ISO 3601 -C0530
ISO 3601 -C0545
ISO 3601 -C0560
ISO 3601 -C0580
ISO 3601 -C0600
ISO 3601 -C0615
ISO 3601 -C0630
ISO 3601 -C0650
ISO 3601 -C0670
ISO 3601 -C0690
ISO 3601 -C0710
ISO 3601 -C0730
ISO 3601 -C0750
ISO 3601 -C0775
ISO 3601 -C0800
ISO 3601 -C0825
ISO 3601 -C0850
ISO 3601 -C0875
ISO 3601 -C0900
ISO 3601 -C0925
ISO 3601 -C0950
ISO 3601 -C0975
ISO 3601 -C1000
ISO 3601 -C1030
ISO 3601 -C1060
ISO 3601 -C1090
ISO 3601 -C1120
ISO 3601 -C1150
ISO 3601 -C1180
ISO 3601 -C1220
ISO 3601 -C1250
ISO 3601 -C1280
Page 62
Internal
Diameter
(inches)
1.398
1.437
1.476
1.524
1.575
1.622
1.673
1.720
1.772
1.819
1.870
1.917
1.969
2.028
2.087
2.146
2.205
2.283
2.362
2.421
2.480
2.559
2.638
2.717
2.795
2.874
2.953
3.051
3.150
3.248
3.346
3.445
3.543
3.642
3.740
3.839
3.937
4.055
4.173
4.291
4.409
4.528
4.646
4.803
4.921
5.039
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.012
0.012
0.012
0.013
0.013
0.013
0.014
0.014
0.014
0.015
0.015
0.015
0.015
0.016
0.016
0.017
0.017
0.017
0.018
0.018
0.018
0.019
0.019
0.020
0.020
0.020
0.021
0.022
0.022
0.022
0.023
0.024
0.024
0.025
0.025
0.026
0.026
0.027
0.028
0.028
0.029
0.030
0.030
0.031
0.032
0.033
0.14
Cross
Section
Tolerance
+/-
0.004
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
132.00
136.00
140.00
145.00
150.00
155.00
160.00
165.00
170.00
175.00
180.00
185.00
190.00
195.00
200.00
212.00
224.00
236.00
250.00
265.00
280.00
300.00
315.00
335.00
355.00
37.50
38.70
40.00
41.20
42.50
43.70
45.00
46.20
47.50
48.70
50.00
51.50
53.00
54.50
56.00
58.00
60.00
61.50
63.00
65.00
67.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.85
0.87
0.89
0.92
0.95
0.98
1.00
1.03
1.06
1.09
1.11
1.14
1.17
1.20
1.22
1.29
1.35
1.42
1.49
1.57
1.65
1.76
1.84
1.95
2.06
0.32
0.32
0.33
0.34
0.35
0.35
0.36
0.37
0.38
0.38
0.39
0.40
0.41
0.42
0.42
0.44
0.45
0.45
0.46
0.48
0.49
3.55
5.30
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.10
0.13
Precision Polymer Engineering Ltd
208-766
208-767
208-768
208-769
208-770
208-771
208-772
208-773
208-774
208-775
208-776
208-777
208-778
208-779
208-780
208-781
208-782
208-783
208-784
208-785
208-786
208-787
208-788
208-789
208-790
208-801
208-802
208-803
208-804
208-805
208-806
208-807
208-808
208-809
208-810
208-811
208-812
208-813
208-814
208-815
208-816
208-817
208-818
208-819
208-820
208-821
Alternative
Size Reference
ISO 3601 -C1320
ISO 3601 -C1360
ISO 3601 -C1400
ISO 3601 -C1450
ISO 3601 -C1500
ISO 3601 -C1550
ISO 3601 -C1600
ISO 3601 -C1650
ISO 3601 -C1700
ISO 3601 -C1750
ISO 3601 -C1800
ISO 3601 -C1850
ISO 3601 -C1900
ISO 3601 -C1950
ISO 3601 -C2000
ISO 3601 -C2120
ISO 3601 -C2240
ISO 3601 -C2360
ISO 3601 -C2500
ISO 3601 -C2650
ISO 3601 -C2800
ISO 3601 -C3000
ISO 3601 -C3150
ISO 3601 -C3350
ISO 3601 -C3550
ISO 3601 -D0375
ISO 3601 -D0387
ISO 3601 -D0400
ISO 3601 -D0412
ISO 3601 -D0425
ISO 3601 -D0437
ISO 3601 -D0450
ISO 3601 -D0462
ISO 3601 -D0475
ISO 3601 -D0487
ISO 3601 -D0500
ISO 3601 -D0515
ISO 3601 -D0530
ISO 3601 -D0545
ISO 3601 -D0560
ISO 3601 -D0580
ISO 3601 -D0600
ISO 3601 -D0615
ISO 3601 -D0630
ISO 3601 -D0650
ISO 3601 -D0670
Page 63
Internal
Diameter
(inches)
5.197
5.354
5.512
5.709
5.906
6.102
6.299
6.496
6.693
6.890
7.087
7.283
7.480
7.677
7.874
8.346
8.819
9.291
9.843
10.433
11.024
11.811
12.402
13.189
13.976
1.476
1.524
1.575
1.622
1.673
1.720
1.772
1.819
1.870
1.917
1.969
2.028
2.087
2.146
2.205
2.283
2.362
2.421
2.480
2.559
2.638
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.033
0.034
0.035
0.036
0.037
0.039
0.039
0.041
0.042
0.043
0.044
0.045
0.046
0.047
0.048
0.051
0.053
0.056
0.059
0.062
0.065
0.069
0.072
0.077
0.081
0.012
0.013
0.013
0.013
0.014
0.014
0.014
0.015
0.015
0.015
0.015
0.016
0.016
0.017
0.017
0.017
0.018
0.018
0.018
0.019
0.019
Cross
Section
Tolerance
+/-
0.14
0.004
0.209
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
69.00
71.00
73.00
75.00
77.50
80.00
82.50
85.00
87.50
90.00
92.50
95.00
97.50
100.00
103.00
106.00
109.00
112.00
115.00
118.00
122.00
125.00
128.00
132.00
136.00
140.00
145.00
150.00
155.00
160.00
165.00
170.00
175.00
180.00
185.00
190.00
195.00
200.00
206.00
212.00
218.00
224.00
230.00
236.00
243.00
250.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/0.50
0.51
0.52
0.53
0.55
0.56
0.57
0.59
0.60
0.62
0.63
0.64
0.66
0.67
0.69
0.71
0.72
0.74
0.76
0.77
0.80
0.81
0.83
0.85
0.87
0.89
0.92
0.95
0.98
1.00
1.03
1.06
1.09
1.11
1.14
1.17
1.20
1.22
1.59
1.63
1.67
1.71
1.75
1.79
1.83
1.88
5.30
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.13
Precision Polymer Engineering Ltd
208-822
208-823
208-824
208-825
208-826
208-827
208-828
208-829
208-830
208-831
208-832
208-833
208-834
208-835
208-836
208-837
208-838
208-839
208-840
208-841
208-842
208-843
208-844
208-845
208-846
208-847
208-848
208-849
208-850
208-851
208-852
208-853
208-854
208-855
208-856
208-857
208-858
208-859
208-860
208-861
208-862
208-863
208-864
208-865
208-866
208-867
Alternative
Size Reference
ISO 3601 -D0690
ISO 3601 -D0710
ISO 3601 -D0730
ISO 3601 -D0750
ISO 3601 -D0775
ISO 3601 -D0800
ISO 3601 -D0825
ISO 3601 -D0850
ISO 3601 -D0875
ISO 3601 -D0900
ISO 3601 -D0925
ISO 3601 -D0950
ISO 3601 -D0975
ISO 3601 -D1000
ISO 3601 -D1030
ISO 3601 -D1060
ISO 3601 -D1090
ISO 3601 -D1120
ISO 3601 -D1150
ISO 3601 -D1180
ISO 3601 -D1220
ISO 3601 -D1250
ISO 3601 -D1280
ISO 3601 -D1320
ISO 3601 -D1360
ISO 3601 -D1400
ISO 3601 -D1450
ISO 3601 -D1500
ISO 3601 -D1550
ISO 3601 -D1600
ISO 3601 -D1650
ISO 3601 -D1700
ISO 3601 -D1750
ISO 3601 -D1800
ISO 3601 -D1850
ISO 3601 -D1900
ISO 3601 -D1950
ISO 3601 -D2000
DIN3771 206,00 x 5,30
DIN3771 212,00 x 5,30
DIN3771 218,00 x 5,30
DIN3771 224,00 x 5,30
DIN3771 230,00 x 5,30
DIN3771 236,00 x 5,30
DIN3771 243,00 x 5,30
DIN3771 250,00 x 5,30
Page 64
Internal
Diameter
(inches)
2.717
2.795
2.874
2.953
3.051
3.150
3.248
3.346
3.445
3.543
3.642
3.740
3.839
3.937
4.055
4.173
4.291
4.409
4.528
4.646
4.803
4.921
5.039
5.197
5.354
5.512
5.709
5.906
6.102
6.299
6.496
6.693
6.89
7.087
7.283
7.480
7.677
7.874
8.110
8.346
8.583
8.819
9.055
9.291
9.567
9.843
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.020
0.020
0.020
0.021
0.022
0.022
0.022
0.023
0.024
0.024
0.025
0.025
0.026
0.026
0.027
0.028
0.028
0.029
0.030
0.030
0.031
0.032
0.033
0.033
0.034
0.035
0.036
0.037
0.039
0.039
0.041
0.042
0.043
0.044
0.045
0.046
0.047
0.048
0.063
0.064
0.066
0.067
0.069
0.070
0.072
0.074
0.209
Cross
Section
Tolerance
+/-
0.005
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
258.00
265.00
272.00
280.00
290.00
300.00
307.00
315.00
325.00
335.00
345.00
355.00
365.00
375.00
387.00
400.00
109.00
112.00
115.00
118.00
122.00
125.00
128.00
132.00
136.00
140.00
145.00
150.00
155.00
160.00
165.00
170.00
175.00
180.00
185.00
190.00
195.00
200.00
206.00
212.00
218.00
224.00
230.00
236.00
243.00
250.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.93
1.98
2.02
2.08
2.14
2.21
2.25
2.30
2.37
2.43
2.49
2.56
2.62
2.68
2.76
2.84
0.72
0.74
0.76
0.77
0.80
0.81
0.83
0.85
0.87
0.89
0.92
0.95
0.98
1.00
1.03
1.06
1.09
1.11
1.14
1.17
1.20
1.22
1.26
1.29
1.32
1.35
1.39
1.42
1.46
1.49
5.30
7.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.13
0.15
Precision Polymer Engineering Ltd
208-868
208-869
208-870
208-871
208-872
208-873
208-874
208-875
208-876
208-877
208-878
208-879
208-880
208-881
208-882
208-883
208-901
208-902
208-903
208-904
208-905
208-906
208-907
208-908
208-909
208-910
208-911
208-912
208-913
208-914
208-915
208-916
208-917
208-918
208-919
208-920
208-921
208-922
208-923
208-924
208-925
208-926
208-927
208-928
208-929
208-930
Alternative
Size Reference
DIN3771 258,00 x 5,30
DIN3771 265,00 x 5,30
DIN3771 272,00 x 5,30
DIN3771 280,00 x 5,30
DIN3771 290,00 x 5,30
DIN3771 300,00 x 5,30
DIN3771 307,00 x 5,30
DIN3771 315,00 x 5,30
DIN3771 325,00 x 5,30
DIN3771 335,00 x 5,30
DIN3771 345,00 x 5,30
DIN3771 355,00 x 5,30
DIN3771 365,00 x 5,30
DIN3771 375,00 x 5,30
DIN3771 387,00 x 5,30
DIN3771 400,00 x 5,30
ISO 3601 -E1090
ISO 3601 -E1120
ISO 3601 -E1150
ISO 3601 -E1180
ISO 3601 -E1220
ISO 3601 -E1250
ISO 3601 -E1280
ISO 3601 -E1320
ISO 3601 -E1360
ISO 3601 -E1400
ISO 3601 -E1450
ISO 3601 -E1500
ISO 3601 -E1550
ISO 3601 -E1600
ISO 3601 -E1650
ISO 3601 -E1700
ISO 3601 -E1750
ISO 3601 -E1800
ISO 3601 -E1850
ISO 3601 -E1900
ISO 3601 -E1950
ISO 3601 -E2000
ISO 3601 -E2060
ISO 3601 -E2120
ISO 3601 -E2180
ISO 3601 -E2240
ISO 3601 -E2300
ISO 3601 -E2360
ISO 3601 -E2430
ISO 3601 -E2500
Page 65
Internal
Diameter
(inches)
10.157
10.433
10.709
11.024
11.417
11.811
12.087
12.402
12.795
13.189
13.583
13.976
14.370
14.764
15.236
15.748
4.291
4.409
4.528
4.646
4.803
4.921
5.039
5.197
5.354
5.512
5.709
5.906
6.102
6.299
6.496
6.693
6.890
7.087
7.283
7.480
7.677
7.874
8.110
8.346
8.523
8.819
9.055
9.291
9.567
9.843
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.076
0.078
0.080
0.082
0.084
0.087
0.089
0.091
0.093
0.096
0.098
0.101
0.103
0.106
0.109
0.112
0.028
0.029
0.030
0.030
0.031
0.032
0.033
0.033
0.034
0.035
0.036
0.037
0.039
0.039
0.041
0.042
0.043
0.044
0.045
0.046
0.047
0.048
0.050
0.051
0.052
0.053
0.055
0.056
0.057
0.059
Cross
Section
Tolerance
+/-
0.209
0.005
0.276
0.006
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
258.00
265.00
272.00
280.00
290.00
300.00
307.00
315.00
325.00
335.00
345.00
355.00
365.00
375.00
387.00
400.00
412.00
425.00
437.00
450.00
462.00
475.00
487.00
500.00
515.00
530.00
545.00
560.00
580.00
600.00
615.00
630.00
650.00
670.00
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/1.54
1.57
1.61
1.65
1.71
1.76
1.80
1.84
1.90
1.95
2.00
2.06
2.11
2.16
2.23
2.29
2.91
2.99
3.07
3.15
3.22
3.30
3.37
3.45
3.54
3.63
3.06
3.13
3.24
3.34
3.42
3.50
3.60
3.71
7.00
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
0.15
208-931
208-932
208-933
208-934
208-935
208-936
208-937
208-938
208-939
208-940
208-941
208-942
208-943
208-944
208-945
208-946
208-947
208-948
208-949
208-950
208-951
208-952
208-953
208-954
208-955
208-956
208-957
208-958
208-959
208-960
208-961
208-962
208-963
208-964
Alternative
Size Reference
ISO 3601 -E2580
ISO 3601 -E2650
ISO 3601 -E2720
ISO 3601 -E2800
ISO 3601 -E2900
ISO 3601 -E3000
ISO 3601 -E3070
ISO 3601 -E3150
ISO 3601 -E3250
ISO 3601 -E3350
ISO 3601 -E3450
ISO 3601 -E3550
ISO 3601 -E3650
ISO 3601 -E3750
ISO 3601 -E3870
ISO 3601 -E4000
DIN3771 412,00 x 7,00
DIN3771 425,00 x 7,00
DIN3771 437,00 x 7,00
DIN3771 450,00 x 7,00
DIN3771 462,00 x 7,00
DIN3771 475,00 x 7,00
DIN3771 487,00 x 7,00
DIN3771 500,00 x 7,00
DIN3771 515,00 x 7,00
DIN3771 530,00 x 7,00
---------
Internal
Diameter
(inches)
10.157
10.433
10.709
11.024
11.417
11.811
12.087
12.402
12.795
13.189
13.583
13.976
14.370
14.764
15.236
15.748
16.220
16.732
17.205
17.717
18.189
18.701
19.173
19.685
20.276
20.866
21.457
22.047
22.835
23.622
24.213
24.803
25.591
26.378
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/0.061
0.062
0.063
0.065
0.067
0.069
0.071
0.072
0.075
0.077
0.079
0.081
0.083
0.085
0.088
0.090
0.115
0.118
0.121
0.124
0.127
0.130
0.133
0.136
0.139
0.143
0.120
0.123
0.128
0.131
0.135
0.138
0.142
0.146
0.276
Cross
Section
Tolerance
+/-
0.006
This table provides a cross-reference between Dowty O-ring size references and the following international standard
O-ring sizes:BS1806 British Standard O-rings (imperial)
BS4518 British Standard O-rings (metric)
DIN3771 German Standard metric O-ring sizes
ISO3601-1 International Organsiation for Standardisation O-ring sizes
Le Joint Francais ‘R’ O-ring sizes
Precision Polymer Engineering Ltd
Page 66
www.prepol.com
Dowty Standard O-ring Sizes
Internal
Diameter
(mm)
Millimetres
Internal
Cross
Diameter
Section
Tolerance
(mm)
+/-
DOWTY
Cross
Size
Section Reference
Tolerance
+/-
Alternative
Size Reference
Internal
Diameter
(inches)
Inches
Internal
Cross
Diameter
Section
Tolerance
(inch)
+/-
Cross
Section
Tolerance
+/-
The Dowty O-ring dimensions provided were taken from the following sections of the Dowty O-ring Catalogue:-.
Section 2: International inch range of O-rings
(200/100 series)
Section 3: British metric range of O-rings
(202/102 series)
Section 4: European metric range of O-rings
(201, 204 and 206 series)
Section 5: International metric range of O-rings
(208/108 series)
The 200+ series denotes O-rings for industrial only, O-rings for Aerospace use are denoted by 100, 102 and 108 series
numbers.
Dowty Part Numbers
Dowty O-rings are assigned a 10 digit part/reference number.
XXX
Inspection
Level
–
Product
reference
1 Aerospace
2 Industrial
XXX
Size
reference
–
XXXX
Material
reference
See
tables
PPE does not accept responsibility for the accuracy of the data provided in this document.
Precision Polymer Engineering Ltd
Page 67
www.prepol.com

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