Technical Threading Chart

TECHNICAL THREADING CHART
UN
Minor Diameter
Thread
Series
Pitch or
in / Rev
Minor Dia
Min (2B / 3B)
Minor Dia
Max (2B)
#0-80 (.060")
UNF
0.012500
0.0465
0.0514
#1-64 (.073")
UNC
0.015625
0.0561
#1-72 (.073")
UNF
0.013889
#2-56 (.086")
UNC
#2-64 (.086")
UNF
Pre-Tap Bore Size
Cut Thread
Roll Form Thread
Pitch Diameter
Minor Dia
Max (3B)
70% Thread 75% Thread 65% Thread
Engagement Engagement Engagement
STI (EG) UN
70% Thread
Engagement
Minor Diameter
Drill Size*
Cut Thread
Pitch Diameter
STI (EG) M
Minor Diameter
Pitch Dia
Min (2B / 3B)
Pitch Dia
Max (2B)
Pitch Dia
Max (3B)
0.0514
0.0519
0.0542
0.0536
0.0486
0.0478
0.0545
0.0541
#1-64 (.073")
UNC
0.015625
0.0958
0.0764
0.0823
0.0832
0.0850
0.0843
0.0785 0.0810
M2
M
0.40
0.0622
0.0622
0.0629
0.0655
0.0648
0.0588
0.0578
0.0661
0.0656
#2-56 (.086")
UNC
0.017857
0.1117
0.0899
0.0961
0.0976
0.0996
0.0989
0.0938 0.0960
M2.2
M
0.0580
0.0634
0.0634
0.0640
0.0665
0.0659
0.0604
0.0595
0.0669
0.0664
#2-64 (.086")
UNF
0.015625
0.1088
0.0894
0.0947
0.0962
0.0981
0.0974
0.0925 0.0925
M2.5
0.017857
0.0667
0.0737
0.0737
0.0744
0.0772
0.0765
0.0698
0.0686
0.0781
0.0775
#3-48 (.099")
UNC
0.020833
0.1289
0.1036
0.1104
0.1126
0.1148
0.1140
0.1065 0.1094
0.015625
0.0691
0.0752
0.0752
0.0759
0.0786
0.0779
0.0718
0.0708
0.0791
0.0786
#3-56 (.099")
UNF
0.017857
0.1247
0.1029
0.1086
0.1106
0.1126
0.1119
0.1040 0.1065
Nominal
Thread
Series
Pitch or
in/Rev
Major
Dia Max
Minor Minor Dia Pitch Dia
Dia Min
Max
Min 2B/3B
Pitch Dia Pitch Dia Aluminum
Max 2B Max 3B
Steel
Nominal
Thread
Series Pitch or Major
mm/Rev Dia Max
Pitch Diameter
Pitch Dia
Min 4H/5H
Definitions
Drill Size*
Cut Thread
Minor
Dia Min
Minor
Dia Max
Pitch Dia Pitch Dia Aluminum
Max 4H Max 5H
2.581
2.087
2.170
2.260
2.295
2.310
2.100
2.100
0.45
2.845
2.297
2.397
2.492
2.532
2.547
2.300
2.350
M
0.45
3.145
2.597
2.697
2.792
2.832
2.847
2.550
2.650
M3
M
0.50
3.716
3.108
3.220
3.325
3.367
3.384
3.150
3.200
M3.5
M
0.60
4.354
3.630
3.755
3.890
3.940
3.959
3.700
3.700
SFM = Surface Feet per Minute
fZ = Feed per Tooth
Steel
#3-48 (.099")
UNC
0.020833
0.0764
0.0845
0.0845
0.0855
0.0885
0.0877
0.0801
0.0787
0.0898
0.0891
#4-40 (.112")
UNC
0.025000
0.1473
0.1175
0.1252
0.1283
0.1308
0.1299
0.1200 0.1200
M4
M
0.70
5.007
4.152
4.292
4.455
4.509
4.529
4.200
4.250
#3-56 (.099")
UNF
0.017857
0.0797
0.0865
0.0865
0.0874
0.0902
0.0895
0.0828
0.0816
0.0911
0.0905
#4-48 (.112")
UNF
0.020833
0.1419
0.1166
0.1229
0.1256
0.1279
0.1271
0.1181 0.1200
M5
M
0.80
6.145
5.174
5.334
5.520
5.577
5.597
5.200
5.300
#4-40 (.112")
UNC
0.025000
0.0849
0.0939
0.0939
0.0958
0.0991
0.0982
0.0893
0.0876
0.1010
0.1001
#5-40 (.125")
UNC
0.025000
0.1603
0.1305
0.1373
0.1413
0.1438
0.1430
0.1339 0.1360
M6
M
1.00
7.422
6.217
6.407
6.650
6.719
6.742
6.250
6.300
#4-48 (.112")
UNF
0.020833
0.0894
0.0968
0.0968
0.0985
0.1016
0.1008
0.0931
0.0917
0.1028
0.1021
#6-32 (.138")
UNC
0.031250
0.1817
0.1448
0.1527
0.1583
0.1611
0.1601
0.1470 0.1495
M7
M
1.00
8.422
7.217
7.407
7.650
7.719
7.742
7.250
7.300
#5-40 (.125")
UNC
0.025000
0.0979
0.1062
0.1062
0.1088
0.1121
0.1113
0.1023
0.1006
0.1140
0.1131
#6-40 (.138")
UNF
0.025000
0.1733
0.1435
0.1503
0.1543
0.1569
0.1560
0.1470 0.1495
M8
M
1.25
9.787
8.271
8.483
8.812
8.886
8.911
8.300
8.400
#5-44 (.125")
UNF
0.022727
0.1004
0.1079
0.1079
0.1102
0.1134
0.1126
0.1043
0.1029
0.1150
0.1142
#8-32 (.164")
UNC
0.031250
0.2077
0.1708
0.1781
0.1843
0.1872
0.1862
0.1730 0.1770
M8 X 1
MF
1.00
9.422
8.217
8.407
8.650
8.719
8.742
8.250
8.300
#6-32 (.138")
UNC
0.031250
0.1040
0.1140
0.1139
0.1177
0.1214
0.1204
0.1096
0.1076
0.1242
0.1231
#8-36 (.164")
UNF
0.027778
0.2032
0.1701
0.1771
0.1821
0.1849
0.1840
0.1730 0.1770
M10
M
1.50
12.131
10.324
10.560
10.974
11.061
11.089
10.500 10.500
#6-40 (.138")
UNF
0.025000
0.1110
0.1190
0.1186
0.1218
0.1252
0.1243
0.1153
0.1136
0.1270
0.1261
#10-24 (.190")
UNC
0.041667
0.2475
0.1990
0.2080
0.2170
0.2203
0.2192
0.2031 0.2055
M10 X 1
MF
1.00
11.422
10.217
10.407
10.650
10.719
10.742
10.250 10.250
SMM = Surface Meters per Minute
Z = Number of Teeth
Unit Conversions
1” = 25.4mm
SFM =
(SFM ×3.82)
RPM =
RPM =
Ø inch
(SMM ×318.31)
RPM × (Ø inch)
SMM = SFM × .3048
SFM =
Ø mm
RPM × (Ø mm)
SMM =
3.82
318.31
Feedrate Calculations
Feed per Revolution = fZ × Z
Feed per Minute = RPM × fZ × Z
#8-32 (.164")
UNC
0.031250
0.1300
0.1390
0.1388
0.1437
0.1475
0.1465
0.1356
0.1336
0.1502
0.1491
#10-32 (.190")
UNF
0.031250
0.2337
0.1968
0.2041
0.2103
0.2133
0.2123
0.2010 0.2031
M10 X 1.25 MF
1.25
11.787
10.271
10.483
10.812
10.886
10.911
10.250 10.250
#8-36 (.164")
UNF
0.027778
0.1340
0.1420
0.1416
0.1460
0.1496
0.1487
0.1387
0.1369
0.1517
0.1508
#12-24 (.216")
UNC
0.041667
0.2735
0.2250
0.2340
0.2430
0.2464
0.2453
0.2280 0.2280
M12
1.75
14.478
12.379
12.644
13.137
13.236
13.271
12.500 12.500
#10-24 (.190") UNC
0.041667
0.1450
0.1550
0.1555
0.1629
0.1672
0.1661
0.1521
0.1494
0.1716
0.1702
1/4-20
UNC
0.050000
0.3187
0.2608
0.2704
0.2825
0.2864
0.2851
0.2660 0.2660
M12 X 1.25 MF
1.25
13.787
12.271
12.483
12.812
12.898
12.926
12.250 12.250
#10-32 (.190") UNF
0.031250
0.1560
0.1640
0.1641
0.1697
0.1736
0.1726
0.1616
0.1596
0.1762
0.1751
1/4-28
UNF
0.035714
0.2995
0.2577
0.2646
0.2732
0.2765
0.2754
0.2610 0.2638
M12 X 1.5
MF
1.50
14.131
12.324
12.560
12.974
13.067
13.099
12.250 12.500
#12-24 (.216") UNC
0.041667
0.1710
0.1810
0.1807
0.1889
0.1933
0.1922
0.1781
0.1754
0.1976
0.1962
5/16-18
UNC
0.055556
0.3884
0.3245
0.3342
0.3486
0.3529
0.3515
0.3320 0.3320
M14
M
2.00
16.822
14.433
14.733
15.299
15.406
15.444
14.500 14.500
#12-28 (.216") UNF
0.035714
0.1770
0.1860
0.1857
0.1928
0.1970
0.1959
0.1835
0.1812
0.2002
0.1990
5/16-24
UNF
0.041667
0.3700
0.3215
0.3288
0.3395
0.3433
0.3421
0.3281 0.3281
M14 X 1.5
MF
1.50
16.131
14.324
14.560
14.974
15.067
15.099
14.250 14.500
#12-32 (.216") UNEF 0.031250
0.1820
0.1900
0.1895
0.1957
0.1998
0.1988
0.1876
0.1856
0.2022
0.2011
3/8-16
UNC
0.062500
0.4602
0.3885
0.3987
0.4156
0.4203
0.4189
0.3970 0.3970
M16
M
2.00
18.822
16.433
16.733
17.299
17.406
17.444
16.500 16.500
Drill Ø Cut Taps = (Nominal Major Ø) – 0.01299 × P × (% of Thread)
1/4-20
0.1960
0.2070
0.2067
0.2175
0.2224
0.2211
0.2045
0.2013
0.2279
0.2262
3/8-24
UNF
0.041667
0.4325
0.3840
0.3910
0.4020
0.4059
0.4047
0.3906 0.3906
M16 X 1.5
MF
1.50
18.131
16.324
16.560
16.974
17.067
17.099
16.250 16.500
Drill Ø Roll Form Taps = (Nominal Major Ø) – 0.0068 × P × (% of Thread)
UNC
0.050000
M
Tapping Feedrate Calculations
Feed per Revolution = P
Feed per Minute = RPM × P
Tap Drill Calculations
60 Degree UN and M Threads Only
1
TPI
P=Thread Pitch=
Minor Diameter
Thread
RPM and Surface Speed Calculations
1mm = .03937”
SMM
.3048
M
Series
Pitch Diameter
Pitch or Minor Dia Minor Dia Pitch Dia
mm / Rev Min (6H) Max (6H) Min (6H)
Pitch Dia
Max (6H)
Pre-Tap Bore Size
Cut Thread
Roll Form Thread
70% Thread
Engagement
75% Thread
Engagement
65% Thread 70% Thread
Engagement Engagement
M2
M
0.40
1.567
1.679
1.740
1.830
1.636
1.610
1.823
1.810
M2 X .25
MF
0.25
**1.729
**1.785
**1.838
**1.896
1.773
1.756
1.890
1.881
M2.2
M
0.45
1.713
1.838
1.908
2.003
1.791
1.762
2.001
1.986
M2.2 X .25 MF
0.25
**1.929
**1.985
**2.038
**2.097
1.973
1.956
2.090
2.081
M2.5
0.45
2.013
2.138
2.208
2.303
2.091
2.062
2.301
2.286
M2.5 X .35 MF
M
0.35
2.121
2.221
2.273
2.358
2.182
2.159
2.345
2.333
M3
M
0.50
2.459
2.599
2.675
2.775
2.545
2.513
2.779
2.762
M3 X .35
MF
0.35
2.621
2.721
2.773
2.863
2.682
2.659
2.845
2.833
M3.5
M
0.60
2.850
3.010
3.110
3.222
2.954
2.915
3.235
3.214
M3.5 X .35 MF
0.35
3.121
3.221
3.273
3.363
3.182
3.159
3.345
3.333
M4
M
0.70
3.242
3.422
3.545
3.663
3.363
3.318
3.691
3.667
M4 X .5
MF
0.50
3.459
3.599
3.675
3.775
3.545
3.513
3.779
3.762
M4.5
M
0.75
3.688
3.878
4.013
4.131
3.818
3.769
4.169
4.143
M5
M
0.80
4.134
4.334
4.480
4.605
4.273
4.221
4.646
4.619
M5 X .5
MF
0.50
4.459
4.599
4.675
4.775
4.545
4.513
4.779
4.762
M6
M
1.00
4.917
5.153
5.350
5.500
5.091
5.026
5.558
5.524
M6 X .5
MF
0.50
5.459
5.599
5.675
5.783
5.545
5.513
5.779
5.762
M6 X .75
MF
0.75
5.188
5.378
5.513
5.645
5.318
5.269
5.669
5.643
M7
M
1.00
5.917
6.153
6.350
6.500
6.091
6.026
6.558
6.524
M8
M
1.25
6.647
6.912
7.188
7.348
6.863
6.782
7.448
7.405
M8 X .75
MF
0.75
7.188
7.378
7.513
7.645
7.318
7.269
7.669
7.643
M8 X 1
MF
1.00
6.917
7.153
7.350
7.500
7.091
7.026
7.558
7.524
M9
M
1.25
7.647
7.912
8.188
8.348
7.863
7.782
8.448
8.405
M10
M
1.50
8.376
8.676
9.026
9.206
8.636
8.539
9.337
9.286
1/4-28
UNF
0.035714
0.2110
0.2200
0.2190
0.2268
0.2311
0.2300
0.2175
0.2152
0.2342
0.2330
7/16-14
UNC
0.071429
0.5343
0.4530
0.4639
0.4839
0.4890
0.4875
0.4531 0.4531
M18
M
2.50
21.513
18.541
18.896
19.624
19.738
19.778
18.750 18.750
1/4-32
UNEF 0.031250
0.2160
0.2240
0.2229
0.2297
0.2339
0.2328
0.2216
0.2196
0.2362
0.2351
7/16-20
UNF
0.050000
0.5062
0.4483
0.4561
0.4700
0.4744
0.4731
0.4531 0.4531
M18 X 1.5
MF
1.50
20.131
18.324
18.560
18.974
19.067
19.099
18.250 18.500
5/16-18
UNC
0.055556
0.2520
0.2650
0.2630
0.2764
0.2817
0.2803
0.2620
0.2584
0.2879
0.2861
1/2-13
UNC
0.076923
0.6042
0.5166
0.5273
0.5499
0.5554
0.5537
0.5156 0.5312
M18 X 2
MF
2.00
20.822
18.433
18.733
19.299
19.406
19.444
18.500 18.500
5/16-24
UNF
0.041667
0.2670
0.2770
0.2754
0.2854
0.2902
0.2890
0.2746
0.2719
0.2941
0.2927
1/2-20
UNF
0.050000
0.5687
0.5108
0.5186
0.5325
0.5371
0.5357
0.5156 0.5156
M20
M
2.50
23.513
20.541
20.896
21.624
21.738
21.778
20.750 20.750
M10 X .75
MF
0.75
9.188
9.378
9.513
9.645
9.318
9.269
9.669
9.643
5/16-32
UNEF 0.031250
0.2790
0.2860
0.2846
0.2922
0.2965
0.2954
0.2841
0.2821
0.2987
0.2976
9/16-12
UNC
0.083333
0.6751
0.5806
0.5918
0.6167
0.6225
0.6208
0.5781 0.5938
M20 X 1.5
MF
1.50
22.131
20.324
20.560
20.974
21.067
21.099
20.250 20.500
M10 X 1
MF
1.00
8.917
9.153
9.350
9.500
9.091
9.026
9.558
9.524
3/8-16
UNC
0.062500
0.3070
0.3210
0.3182
0.3344
0.3401
0.3387
0.3182
0.3141
0.3474
0.3453
9/16-18
UNF
0.055556
0.6384
0.5745
0.5826
0.5986
0.6035
0.6020
0.5781 0.5781
M20 X 2
MF
2.00
22.822
20.433
20.733
21.299
21.406
21.444
20.500 20.500
M10 X 1.25 MF
1.25
8.647
8.912
9.188
9.348
8.863
8.782
9.448
9.405
3/8-24
UNF
0.041667
0.3300
0.3400
0.3372
0.3479
0.3528
0.3516
0.3371
0.3344
0.3566
0.3552
5/8-11
UNC
0.090909
0.7477
0.6447
0.6564
0.6841
0.6903
0.6885
0.6562 0.6562
M22
M
2.50
25.513
22.541
22.896
23.624
23.738
23.778
22.750 22.750
M11
M
1.50
9.376
9.676
10.026
10.206
9.636
9.539
10.337
10.286
3/8-32
UNEF 0.031250
0.3410
0.3490
0.3469
0.3547
0.3591
0.3580
0.3466
0.3446
0.3612
0.3601
5/8-18
UNF
0.055556
0.7009
0.6370
0.6451
0.6611
0.6661
0.6646
0.6406 0.6406
M22 X 1.5
MF
1.50
24.131
22.324
22.560
22.974
23.067
23.099
22.250 22.500
M12
M
1.75
10.106
10.441
10.863
11.063
10.409
10.295
11.227
11.167
M12 X .75
MF
0.75
11.188
11.378
11.513
11.649
11.318
11.269
11.669
11.643
M12 X 1
MF
1.00
10.917
11.153
11.350
11.510
11.091
11.026
11.558
11.524
M12 X 1.25 MF
1.25
10.647
10.912
11.188
11.368
10.863
10.782
11.448
11.405
M12 X 1.5
MF
1.50
10.376
10.676
11.026
11.216
10.636
10.539
11.337
11.286
M14
M
2.00
11.835
12.210
12.701
12.913
12.181
12.052
13.116
13.048
M14 X 1
MF
1.00
12.917
13.153
13.350
13.510
13.091
13.026
13.558
13.524
M14 X 1.25 MF
1.25
12.647
12.912
13.188
13.368
12.863
12.782
13.448
13.405
M14 X 1.5
MF
1.50
12.376
12.676
13.026
13.216
12.636
12.539
13.337
13.286
M15 x 1
MF
1.00
13.917
14.153
14.350
14.510
14.091
14.026
14.558
14.524
0.071429
0.3600
0.3760
0.3717
0.3911
0.3972
0.3957
0.3726
0.3679
0.4059
0.4035
3/4-10
UNC
0.100000
0.8850
0.7716
0.7838
0.8149
0.8216
0.8196
0.7812 0.7812
M22 X 2
MF
2.00
24.822
22.433
22.733
23.299
23.406
23.444
22.500 22.500
7/16-20
UNF
0.050000
0.3830
0.3950
0.3916
0.4050
0.4104
0.4091
0.3920
0.3888
0.4154
0.4137
3/4-16
UNF
0.062500
0.8352
0.7635
0.7720
0.7906
0.7961
0.7945
0.7656 0.7656
M24
M
3.00
28.238
24.649
25.049
25.948
26.093
26.135
24.750 24.750
7/16-28
UNEF 0.035714
0.3990
0.4070
0.4051
0.4143
0.4190
0.4178
0.4050
0.4027
0.4217
0.4205
7/8-9
UNC
0.111111
1.0247
0.8990
0.9119
0.9471
0.9543
0.9522
0.9062 0.9062
M24 X 2
MF
2.00
26.822
24.433
24.733
25.299
25.414
25.454
24.500 24.500
1/2-13
UNC
0.076923
0.4170
0.4340
0.4284
0.4500
0.4565
0.4548
0.4301
0.4251
0.4660
0.4634
7/8-14
UNF
0.071429
0.9718
0.8905
0.8994
0.9214
0.9274
0.9257
0.8906 0.8906
M27
M
3.00
31.238
27.649
28.049
28.948
29.093
29.135
27.750 27.750
1/2-20
UNF
0.050000
0.4460
0.4570
0.4537
0.4675
0.4731
0.4717
0.4545
0.4513
0.4779
0.4762
1-8
UNC
0.125000
1.1681
1.0271
1.0421
1.0812
1.0890
1.0868
1.0312 1.0312
M27 X 2
MF
2.00
29.822
27.433
27.733
28.299
28.414
28.454
27.500 27.500
1/2-28
UNEF 0.035714
0.4610
0.4700
0.4676
0.4768
0.4816
0.4804
0.4675
0.4652
0.4842
0.4830
1-12
UNF
0.083333
1.1126
1.0181
1.0281
1.0542
1.0608
1.0589
1.0156 1.0312
M30
M
3.50
34.925
30.757
31.207
32.273
32.428
32.472
31.000 31.000
9/16-12
UNC
0.083333
0.4720
0.4900
0.4843
0.5084
0.5152
0.5135
0.4867
0.4813
0.5257
0.5228
1-14
UNS
0.071429
1.0968
1.0155
1.0243
1.0464
1.0527
1.0508
1.0156 1.0312
M30 X 2
MF
2.00
32.822
30.433
30.733
31.299
31.414
31.454
30.500 30.500
9/16-18
UNF
0.055556
0.5020
0.5150
0.5106
0.5264
0.5323
0.5308
0.5120
0.5084
0.5379
0.5361
1.1/8-7
UNC
0.142857
1.3171
1.1559
1.1730
1.2178
1.2262
1.2239
1.1719 1.1719
M33
M
3.50
37.925
33.757
34.207
35.273
35.428
35.472
34.000 34.000
9/16-24
UNEF 0.041667
0.5170
0.5270
0.5244
0.5354
0.5405
0.5393
0.5246
0.5219
0.5441
0.5427
1.1/8-12
UNF
0.083333
1.2376
1.1431
1.1531
1.1792
1.1860
1.1841
1.1406 1.1562
M33 X 2
MF
2.00
35.822
33.433
33.733
34.299
34.414
34.454
UNC
0.090909
0.5270
0.5460
0.5391
0.5660
0.5732
0.5714
0.5423
0.5364
0.5848
0.5817
1.1/4-7
UNC
0.142857
1.4421
1.2809
1.2980
1.3428
1.3514
1.3490
1.2969 1.2969
M36
M
4.00
41.615
36.866
37.341
38.598
38.763
38.809
37.000 37.000
5/8-18
UNF
0.055556
0.5650
0.5780
0.5730
0.5889
0.5949
0.5934
0.5745
0.5709
0.6004
0.5986
1.1/4-12
UNF
0.083333
1.3626
1.2681
1.2781
1.3042
1.3112
1.3092
1.2656 1.2812
M36 X 2
MF
2.00
38.822
36.433
36.733
37.299
37.414
37.454
36.500 36.500
5/8-24
UNEF 0.041667
0.5800
0.5900
0.5869
0.5979
0.6031
0.6018
0.5871
0.5844
0.6066
0.6052
1.3/8-6
UNC
0.166667
1.5982
1.4110
1.4310
1.4832
1.4926
1.4900
1.4219 1.4219
M36 X 3
MF
3.00
40.238
36.649
37.049
37.948
38.093
38.135
37.000 37.000
3/4-10
UNC
0.100000
0.6420
0.6630
0.6545
0.6850
0.6927
0.6907
0.6591
0.6526
0.7058
0.7024
1.3/8-12
UNF
0.083333
1.4876
1.3931
1.4031
1.4292
1.4364
1.4343
1.3906 1.4062
M39
M
4.00
44.615
39.866
40.341
41.598
41.763
41.809
40.000 40.000
3/4-16
UNF
0.062500
0.6820
0.6960
0.6909
0.7094
0.7159
0.7143
0.6932
0.6891
0.7224
0.7203
1.1/2-6
UNC
0.166667
1.7232
1.5360
1.5560
1.6082
1.6177
1.6151
1.5469 1.5469
M39 X 2
MF
2.00
41.822
39.433
36.733
40.299
40.414
40.454
39.500 39.500
3/4-20
UNEF 0.050000
0.6960
0.7070
0.7036
0.7175
0.7232
0.7218
0.7045
0.7013
0.7279
0.7262
1.1/2-12
UNF
0.083333
1.6126
1.5181
1.5281
1.5542
1.5615
1.5595
1.5156 1.5312
M39 X 3
MF
3.00
43.238
39.649
40.049
40.948
41.093
41.135
40.000 40.000
7/8-9
UNC
0.111111
0.7550
0.7780
0.7681
0.8028
0.8110
0.8089
0.7740
0.7668
0.8259
0.8221
7/8-14
UNF
0.071429
0.7980
0.8130
0.8067
0.8286
0.8356
0.8339
0.8101
0.8054
0.8434
0.8410
7/8-20
UNEF 0.050000
0.8210
0.8320
0.8286
0.8425
0.8483
0.8469
0.8295
0.8263
0.8529
0.8512
1-8
UNC
0.125000
0.8650
0.8900
0.8797
0.9188
0.9276
0.9254
0.8863
0.8782
0.9448
0.9405
1-12
UNF
0.083333
0.9100
0.9280
0.9198
0.9459
0.9535
0.9516
0.9242
0.9188
0.9632
0.9603
1-14
UNS
0.071429
0.9230
0.9380
0.9315
0.9536
0.9605
0.9588
0.9351
0.9304
0.9684
0.9660
1-20
UNEF 0.050000
0.9460
0.9570
0.9536
0.9675
0.9734
0.9719
0.9545
0.9513
0.9779
0.9762
1.1/16-8
UN
0.125000
0.9270
0.9520
0.9422
0.9813
0.9902
0.9880
0.9488
0.9407
1.0073
1.0030
1.1/16-12
UN
0.083333
0.9720
0.9900
0.9823
1.0084
1.0158
1.0139
0.9867
0.9813
1.0257
1.0228
UNEF 0.055556
1.0020
1.0150
1.0105
1.0264
1.0326
1.0311
1.0120
1.0084
1.0379
1.0361
1.1/8-7
UNC
0.142857
0.9700
0.9980
0.9875
1.0322
1.0416
1.0393
0.9951
0.9858
1.0619
1.0570
1.1/8-8
UN
0.125000
0.9900
1.0150
1.0047
1.0438
1.0528
1.0505
1.0113
1.0032
1.0698
1.0655
1.1/8-12
UNF
0.083333
1.0350
1.0530
1.0448
1.0709
1.0787
1.0768
1.0492
1.0438
1.0882
1.0853
1.1/8-18
UNEF 0.055556
1.0650
1.0780
1.0730
1.0889
1.0951
1.0936
1.0745
1.0709
1.1004
1.0986
1.3/16-8
UN
0.125000
1.0520
1.0770
1.0672
1.1063
1.1154
1.1131
1.0738
1.0657
1.1323
1.1280
1.3/16-12
UN
0.083333
1.0970
1.1150
1.1073
1.1334
1.1409
1.1390
1.1117
1.1063
1.1507
1.1478
1.3/16-16
UN
0.062500
1.1200
1.1340
1.1284
1.1469
1.1535
1.1518
1.1307
1.1266
1.1599
1.1578
1.3/16-18
UNEF 0.055556
1.1270
1.1400
1.1355
1.1514
1.1577
1.1561
1.1370
1.1334
1.1629
1.1611
1.1/4-7
UNC
0.142857
1.0950
1.1230
1.1125
1.1572
1.1668
1.1644
1.1201
1.1108
1.1869
1.1820
1.1/4-8
UN
0.125000
1.1150
1.1400
1.1297
1.1688
1.1780
1.1757
1.1363
1.1282
1.1948
1.1905
1.1/4-12
UNF
0.083333
1.1600
1.1780
1.1698
1.1959
1.2039
1.2019
1.1742
1.1688
1.2132
1.2103
1.1/4-18
UNEF 0.055556
1.1900
1.2030
1.1980
1.2139
1.2202
1.2186
1.1995
1.1959
1.2254
1.2236
1.5/16-8
UN
0.125000
1.1770
1.2020
1.1922
1.2313
1.2405
1.2382
1.1988
1.1907
1.2573
1.2530
1.5/16-12
UN
0.083333
1.2220
1.2400
1.2323
1.2584
1.2659
1.2641
1.2367
1.2313
1.2757
1.2728
1.5/16-18
UNEF 0.055556
1.2520
1.2650
1.2605
1.2764
1.2828
1.2812
1.2620
1.2584
1.2879
1.2861
No. of threads l4
6-8
Threading Tech Line
Expert support for your
technical threading questions.
844-4-THREAD
Use the JEL TPT online or
mobile app to select the best
thread milling tool for your
application, calculate machine
cycle time, and download the
related CNC program. Go to
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on your iOS or Android mobile device.
Apple
Android
Thread
Series
Pitch or
in/Rev
#4-40 (.112")
UNJC
#4-48 (.112")
UNJF
Pitch Diameter
Pitch Dia
Max (3B)
DD
2-3
< 1.5<1.5
1.5 1.5
-2 -2
3.53.5
- 5- 5
Blind and through
hole threads in short
chipping materials
Through hole threads
F F
E E
Blind hole
Blind hole threads with Blind hole threads
threads with
short thread run-out
with very short
very short
(bottoming tap)
thread run-out
thread run-out
Blind hole threads
with long thread
run-out (plug tap)
Drill thread milling
Helical drill thread milling
Thread milling
Thread milling
BGF
DBGF
MKG
MGF
Steel
3.0 × D
Stainless steel
2.0 × D
2.0 × D
M16
M
2.00
13.835
14.210
14.701
14.913
14.181
14.052
15.116
15.048
2.0 × D
2.0 × D
M16 X 1
MF
1.00
14.917
15.153
15.350
15.510
15.091
15.026
15.558
15.524
M16 X 1.5
MF
1.50
14.376
14.676
15.026
15.216
14.636
14.539
15.337
15.286
M18
M
2.50
15.294
15.744
16.376
16.600
15.727
15.564
16.895
16.810
M18 X 1
MF
1.00
16.917
17.153
17.350
17.510
17.091
17.026
17.558
17.524
M18 X 1.5
MF
1.50
16.376
16.676
17.026
17.216
16.636
16.539
17.337
17.286
M18 X 2
MF
2.00
15.835
16.210
16.701
16.913
16.181
16.052
17.116
17.048
M20
M
2.50
17.294
17.744
18.376
18.600
17.727
17.564
18.895
18.810
M20 X 1
MF
1.00
18.917
19.153
19.350
19.510
19.091
19.026
19.558
19.524
M20 X 1.5
MF
1.50
18.376
18.676
19.026
19.216
18.636
18.539
19.337
19.286
M20 X 2
MF
2.00
17.835
18.210
18.701
18.913
18.181
18.052
19.116
19.048
M22
M
2.50
19.294
19.744
20.376
20.600
19.727
19.564
20.895
20.810
M22 X 1
MF
1.00
20.917
21.153
21.350
21.510
21.091
21.026
21.558
21.524
20.636
20.539
21.337
21.286
Grey cast iron
2.5 × D
3.0 × D
2.0 × D
2.5 × D
Nodular grey cast iron
2.0 × D
3.0 × D
2.0 × D
2.0 × D
2.0 × D
2.0 × D
1.5 x D / 2.0 × D
1.5 x D / 2.0 × D
Titanium alloys
Nickel alloys
Copper alloys
2.5 × D
3.0 × D
2.0 × D
2.5 × D
2.5 × D / 3.0 × D
3.0 × D
2.0 × D
2.5 × D / 3.0 × D
2.5 × D
3.0 × D
2.0 × D
2.5 × D
Plastics
Minor Diameter
l4
C
3.5 - 5.5
Short through hole
threads
Aluminium
UNJ
l4
B
Material
*Based on commonly available drill diameters
Straight or helical flutes
l4
A
Application
33.500 33.500
5/8-11
1.1/16-18
Tap chamfer form
UNC
Straight flute spiral point
Straight flute
l4
Possible thread milling engagements
7/16-14
Type of flute
Pre-Tap Bore Size
Cut Thread
MJ
65% Thread 70% Thread
Engagement Engagement
Thread
Minor Dia
Min (3B)
Minor Dia
Max (3B)
Pitch Dia
Min (3B)
0.025000
0.0877
0.0942
0.0958
0.0982
0.0909
0.0893
0.020833
0.0917
0.0971
0.0985
0.1008
0.0944
0.0931
Minor Diameter
Pitch or
mm/Rev
Minor Dia
Min (4H)
Minor Dia
Max (4H)
MJ1.6 X .35
0.35
1.259
1.359
MJ2 X .4
0.40
1.610
1.722
Pre-Tap Bore Size
Cut Thread
Pitch Diameter
Pitch Dia
Min (5H)
Pitch Dia
Max (5H)
65% Thread
Engagement
70% Thread
Engagement
*1.373
*1.426
1.304
1.282
M22 X 1.5
MF
1.50
20.376
20.676
21.026
21.216
*1.740
*1.796
1.662
1.636
M22 X 2
MF
2.00
19.835
20.210
20.701
20.913
20.181
20.052
21.116
21.048
M
3.00
20.752
21.252
22.051
22.316
*21.272
21.077
22.674
22.572
#6-32 (.138")
UNJC
0.031250
0.1076
0.1157
0.1177
0.1205
0.1116
0.1096
MJ2.5 X .45
0.45
2.062
2.187
*2.208
*2.268
2.120
2.091
M24
#6-40 (.138")
UNJF
0.025000
0.1137
0.1202
0.1218
0.1243
0.1169
0.1153
MJ3 X .5
0.50
2.513
2.653
*2.675
*2.738
2.578
2.545
M24 X 1
MF
1.00
22.917
23.153
23.350
23.520
23.091
23.026
23.558
23.524
#8-32 (.164")
UNJC
0.031250
0.1336
0.1417
0.1437
0.1465
0.1376
0.1356
MJ3.5 X .6
0.60
2.915
3.075
*3.110
*3.181
2.993
2.954
M24 X 1.5
MF
1.50
22.376
22.676
23.026
23.226
22.636
22.539
23.337
23.286
#8-36 (.164")
UNJF
0.027778
0.1370
0.1442
0.1460
0.1487
0.1405
0.1387
MJ4 X .7
0.70
3.318
3.498
*3.545
*3.620
3.409
3.363
M24 X 2
MF
2.00
21.835
22.210
22.701
22.925
22.181
22.052
23.116
23.048
#10-24 (.190") UNJC
0.041667
0.1494
0.1600
0.1629
0.1661
0.1548
0.1521
MJ5 X .8
0.80
4.221
4.421
*4.480
*4.560
4.325
4.273
M26 X 1
MF
1.00
24.917
25.153
25.350
25.520
25.091
25.026
25.558
25.524
#10-32 (.190") UNJF
0.031250
0.1596
0.1675
0.1697
0.1726
0.1636
0.1616
MJ6 X 1
1.00
5.026
5.216
5.350
5.445
5.156
5.091
M26 X 1.5
MF
1.50
24.376
24.676
25.026
25.226
24.636
24.539
25.337
25.286
1/4-20
UNJC
0.050000
0.2013
0.2121
0.2175
0.2211
0.2078
0.2045
MJ7 X 1
1.00
6.026
6.216
6.350
6.445
6.156
6.091
M27
M
3.00
23.752
24.252
25.051
25.316
*24.272
24.077
25.674
25.572
1/4-28
UNJF
0.035714
0.2152
0.2229
0.2268
0.2300
0.2198
0.2175
MJ8 X 1
1.00
7.026
7.216
7.350
7.445
7.156
7.091
M27 X 1.5
MF
1.50
25.376
25.676
26.026
26.226
25.636
25.539
26.337
26.286
5/16-18
UNJC
0.055556
0.2584
0.2690
0.2764
0.2803
0.2656
0.2620
MJ8 X 1.25
1.25
6.782
6.994
7.188
7.288
6.945
6.863
M27 X 2
MF
2.00
24.835
25.210
25.701
25.925
25.181
25.052
26.116
26.048
5/16-24
UNJF
0.041667
0.2719
0.2799
0.2854
0.2890
0.2773
0.2746
MJ10 X 1.25
1.25
8.782
8.994
9.188
9.288
8.945
8.863
M28 X 1.5
MF
1.50
26.376
26.676
27.026
27.226
26.636
26.539
27.337
27.286
3/8-16
UNJC
0.062500
0.3141
0.3250
0.3344
0.3387
0.3222
0.3182
MJ10 X 1.5
1.50
8.539
8.775
9.026
9.138
8.733
8.636
M28 X 2
MF
2.00
25.835
26.210
26.701
26.925
26.181
26.052
27.116
27.048
3/8-24
UNJF
0.041667
0.3344
0.3417
0.3479
0.3516
0.3398
0.3371
MJ12 X 1.25
1.25
10.782
10.994
11.188
11.300
10.945
10.863
M30
M
3.50
26.211
26.771
27.727
28.007
*26.818
26.590
28.453
28.334
1/2-13
UNJC
0.076923
0.4251
0.4368
0.4500
0.4548
0.4351
0.4301
MJ12 X 1.75
1.75
10.295
10.560
10.863
10.988
10.522
10.409
M30 X 1.5
MF
1.50
28.376
28.676
29.026
29.226
28.636
28.539
29.337
29.286
1/2-20
UNJF
0.050000
0.4513
0.4591
0.4675
0.4717
0.4578
0.4545
MJ14 X 1.5
1.50
12.539
12.775
13.026
13.144
12.733
12.636
M30 X 2
MF
2.00
27.835
28.210
28.701
28.925
28.181
28.052
29.116
29.048
5/8-11
UNJC
0.090909
0.5365
0.5474
0.5660
0.5714
*0.5482
0.5423
MJ16 X 1.5
1.50
14.539
14.775
15.026
15.144
14.733
14.636
M30 X 3
MF
3.00
26.752
27.252
28.051
28.316
*27.272
27.077
28.674
28.572
5/8-18
UNJF
0.055556
0.5709
0.5789
0.5889
0.5934
0.5781
0.5745
MJ18 X 1.5
1.50
16.539
16.775
17.026
17.144
16.733
16.636
M33
M
3.50
29.211
29.771
30.727
31.007
*29.817
29.590
31.453
31.334
3/4-10
UNJC
0.100000
0.6526
0.6646
0.6850
0.6907
*0.6656
0.6591
MJ20 X 1.5
1.50
18.539
18.775
19.026
19.144
18.733
18.636
M33 X 1.5
MF
1.50
31.376
31.676
32.026
32.226
31.636
31.539
32.337
32.286
M33 X 2
MF
2.00
30.835
31.210
31.701
31.925
31.181
31.052
32.116
32.048
M33 X 3
MF
3.00
29.752
30.252
31.051
31.316
*30.272
30.077
31.674
31.572
M36
M
4.00
31.670
32.270
33.402
33.702
*32.363
32.103
34.232
34.096
M36 X 1.5
MF
1.50
34.376
34.676
35.026
35.226
34.636
34.539
35.337
35.286
M36 X 2
MF
2.00
33.835
34.210
34.701
34.925
34.181
34.052
35.116
35.048
M36 X 3
MF
3.00
32.752
33.252
34.051
34.316
*33.272
33.077
34.674
34.572
M39
M
4.00
34.670
35.270
36.402
36.702
*35.363
35.103
37.232
37.096
MF
2.00
36.835
37.210
37.701
37.925
37.181
37.052
38.116
38.048
1.3/8-6
UNC
0.166667
1.1950
1.2250
1.2146
1.2667
1.2771
1.2745
1.2235
1.2126
1.3013
1.2957
1.3/8-8
UN
0.125000
1.2400
1.2650
1.2547
1.2938
1.3031
1.3008
1.2613
1.2532
1.3198
1.3155
3/4-16
UNJF
0.062500
0.6891
0.6976
0.7094
0.7143
0.6972
0.6932
MJ22 X 1.5
1.50
20.539
20.775
21.026
21.144
20.733
20.636
1.3/8-12
UNF
0.083333
1.2850
1.3030
1.2948
1.3209
1.3291
1.3270
1.2992
1.2938
1.3382
1.3353
7/8-9
UNJC
0.111111
0.7668
0.7801
0.8028
0.8089
*0.7812
0.7740
MJ24 X 2
2.00
22.051
22.351
22.701
22.841
22.311
22.181
1.3/8-18
UNEF 0.055556
1.3150
1.3280
1.3230
1.3389
1.3453
1.3437
1.3245
1.3209
1.3504
1.3486
7/8-14
UNJF
0.071429
0.8054
0.8151
0.8286
0.8339
0.8147
0.8101
MJ27 X 2
2.00
25.051
25.351
25.701
25.841
25.311
25.181
1.7/16-8
UN
0.125000
1.3020
1.3270
1.3172
1.3563
1.3657
1.3634
1.3238
1.3157
1.3823
1.3780
1-8
UNJC
0.125000
0.8783
0.8933
0.9188
0.9254
*0.8945
0.8863
MJ30 X 2
2.00
28.051
28.351
28.701
28.841
28.311
28.181
1.7/16-18
UNEF 0.055556
1.3770
1.3900
1.3855
1.4014
1.4078
1.4062
1.3870
1.3834
1.4129
1.4111
1-12
UNJF
0.083333
0.9189
0.9289
0.9459
0.9516
*0.9296
0.9242
MJ33 X 2
2.00
31.051
31.351
31.701
31.841
31.311
31.181
1.1/2-6
UNC
0.166667
1.3200
1.3500
1.3396
1.3917
1.4022
1.3996
1.3485
1.3376
1.4263
1.4207
1.1/2-8
UN
0.125000
1.3650
1.3900
1.3797
1.4188
1.4283
1.4259
1.3863
1.3782
1.4448
1.4405
*May not be within 3B tolerance
*Denotes 6H pitch tolerance
1.1/2-12
UNF
0.083333
1.4100
1.4280
1.4198
1.4459
1.4542
1.4522
1.4242
1.4188
1.4632
1.4603
M39 X 2
1.1/2-18
UNEF 0.055556
1.4400
1.4530
1.4480
1.4639
1.4704
1.4687
1.4495
1.4459
1.4754
1.4736
M39 X 3
MF
3.00
35.752
36.252
37.051
37.316
*36.272
36.077
37.674
37.572
1.5/8-8
UN
0.125000
1.4900
1.5150
1.5047
1.5438
1.5535
1.5510
1.5113
1.5032
1.5698
1.5655
M42
M
4.50
37.129
37.799
39.077
39.392
*37.908
37.616
40.011
39.858
1.5/8-12
UN
0.083333
1.5350
1.5530
1.5448
1.5709
1.5786
1.5767
1.5492
1.5438
1.5882
1.5853
M42 X 3
MF
3.00
38.752
39.252
40.051
40.316
*39.272
39.077
40.674
40.572
1.3/4-5
UNC
0.200000
1.5330
1.5670
1.5575
1.6201
1.6317
1.6288
*1.5681
1.5552
1.6616
1.6548
M45
M
4.50
40.129
40.799
42.077
42.392
*40.908
40.616
43.011
42.858
1.3/4-8
UN
0.125000
1.6150
1.6400
1.6297
1.6688
1.6786
1.6762
1.6363
1.6282
1.6948
1.6905
M45 X 3
MF
3.00
41.752
42.252
43.051
43.316
*42.272
42.077
43.674
43.572
1.7/8-8
UN
0.125000
1.7400
1.7650
1.7547
1.7938
1.8038
1.8013
1.7613
1.7532
1.8198
1.8155
M48
M
5.00
42.587
43.297
44.752
45.087
*43.454
43.129
45.790
45.620
1.7/8-12
UN
0.083333
1.7850
1.8030
1.7948
1.8209
1.8287
1.8268
1.7992
1.7938
1.8382
1.8353
M48 X 3
MF
3.00
44.752
45.252
46.051
46.331
*45.272
45.077
46.674
46.572
M52
M
5.00
46.587
47.297
48.752
49.087
*47.454
47.129
49.790
49.620
M52 X 4
MF
4.00
47.670
48.270
49.402
49.717
*48.363
48.103
50.232
50.096
M56
M
5.50
50.046
50.796
52.428
52.783
*50.999
50.642
53.569
53.382
M56 X 2
MF
2.00
53.835
54.210
54.701
54.937
54.181
54.052
55.116
55.048
M56 X 3
MF
3.00
52.752
53.252
54.051
54.331
*53.272
53.077
54.674
54.572
M60
M
5.50
54.046
54.796
56.428
56.783
*54.999
54.642
57.569
57.382
M60 X 4
MF
4.00
55.670
56.270
57.402
57.717
*56.363
56.103
58.232
58.096
M64
M
6.00
57.505
58.305
60.103
60.478
*58.544
58.155
61.348
61.144
M64 X 3
MF
3.00
60.752
61.252
62.051
62.331
*61.272
61.077
62.674
62.572
M64 X 4
MF
4.00
59.670
60.270
61.402
61.717
*60.363
60.103
62.232
62.096
M68
M
6.00
61.505
62.305
64.103
64.478
*62.544
62.155
65.348
65.144
M68 X 4
MF
4.00
63.670
64.270
65.402
65.717
*64.363
64.103
66.232
66.096
2-4.5
UNC
0.222222
1.7590
1.7950
1.7861
1.8557
1.8681
1.8650
*1.7979
1.7835
1.9018
1.8942
2-8
UN
0.125000
1.8650
1.8900
1.8797
1.9188
1.9289
1.9264
1.8863
1.8782
1.9448
1.9405
2.1/4-8
UN
0.125000
2.1150
2.1400
2.1297
2.1688
2.1792
2.1766
2.1363
2.1282
2.1948
2.1905
2.1/2-4
UNC
0.250000
2.2290
2.2670
2.2594
2.3376
2.3511
2.3477
*2.2727
2.2564
2.3895
2.3810
2.1/2-8
UN
0.125000
2.3650
2.3900
2.3797
2.4188
2.4294
2.4268
2.3863
2.3782
2.4448
2.4405
2.1/2-12
UN
0.083333
2.4100
2.4280
2.4198
2.4459
2.4540
2.4519
2.4242
2.4188
2.4632
2.4603
2.3/4-8
UN
0.125000
2.6150
2.6400
2.6297
2.6688
2.6796
2.6769
2.6363
2.6282
2.6948
2.6905
3-8
UN
0.125000
2.8650
2.8900
2.8797
2.9188
2.9299
2.9271
2.8863
2.8782
2.9448
2.9405
3.5-8
UN
0.125000
3.3650
3.3900
3.3797
3.4188
3.4303
3.4274
3.3863
3.3782
3.4448
3.4405
4-8
UN
0.125000
3.8650
3.8900
3.8797
3.9188
3.9307
3.9277
3.8863
3.8782
3.9448
3.9405
4.1/2-8
UN
0.125000
4.3650
4.3900
4.3797
4.4188
4.4310
4.4280
4.3863
4.3782
4.4448
4.4405
5-8
UN
0.125000
4.8650
4.8900
4.8797
4.9188
4.9314
4.9282
4.8863
4.8782
4.9448
4.9405
* With large pitches 70% thread engagement may not be within 2B limits
$9.99 USD
Internal Taper Pipe Thread
NPT / ANPT / NPTF
PTF-SAE Short
Pitch
Diameter at E1
Hand Tight L1
Gage Length*
Hole Depth for SAE
Short Tap
Pitch
Diameter at E0
Hand Tight L1
Gage Length*
Pipe Threads
Pre-Tap Bore Size
Pitch
Diameter at E1
K0
NPT / ANPT
K0 NPTF / PTF
SAE-Short
Thread
Pitch or Feed per
Revolution
OD of Pipe
(External Thread)
NPSC
NPS / NPSM
Pitch Dia Pitch Dia Minor
Min 2B
Max 2B Dia Min
Minor
Dia Max
Pitch
Dia Min
–
–
–
–
0.27887
0.1230
0.4564
0.27118
0.1600
0.28118
0.2415
0.2443
1/16 - 27
0.037037
0.3125
–
–
0.37129
0.1244
0.4578
0.36351
0.1615
0.37360
0.3338
0.3367
1/8 - 27
0.037037
0.4050
0.358
0.364
0.3736
0.3783
0.3701
0.48815
0.1722
0.6722
0.47739
0.2278
0.49163
0.4329
0.4362
1/4 - 18
0.055556
0.5400
0.468
0.481
0.4916
0.4974
0.62354
0.1844
0.6844
0.61201
0.2400
0.62701
0.5675
0.5708
3/8 - 18
0.055556
0.6750
0.603
0.612
0.6270
0.77397
0.2486
0.8915
0.75843
0.3200
0.77843
0.7014
0.7034
1/2 - 14
0.071429
0.8400
0.747
0.759
0.98441
0.2676
0.9105
0.96768
0.3390
0.98887
0.9106
0.9127
3/4 - 14
0.071429
1.0500
0.958
1.23320
0.3130
1.0956
1.21363
0.4000
1.23863
1.1441
1.1470
1 - 11.5
0.086957
1.3150
1.57795
0.3330
1.1156
1.55713
0.4200
1.58338
1.4876
1.4905 1.1/4 - 11.5
0.086957
1.81691
0.3330
1.1156
1.79609
0.4200
1.82234
1.7266
1.7295 1.1/2 - 11.5
2.29084
0.3490
1.1316
2.26902
0.4360
2.29627
2.1995
2.2024
2.75435
0.5570
1.6820
2.71953
0.6820
2.76216
2.6195
3.38069
0.6410
1.7660
3.34063
0.7660
3.38850
3.2406
Internal Straight Pipe Thread
NPSF
Pitch Minimum Pitch
Dia Max Minor Dia Dia Min
NPSL
Pitch
Minimum
Pitch
Dia Max Minor Dia Dia Min
NPSI
Pitch
Minimum
Pitch
Dia Max Minor Dia Dia Min
–
0.2768
0.2803
0.2482
–
–
0.3771
0.340
0.3692
0.3727
0.3406
0.3863
0.4864
0.4968
0.442
0.4852
0.4904
0.4422
0.6329
0.6218
0.6322
0.577
0.6205
0.6257
0.7784
0.7851
0.7717
0.7851
0.715
0.7700
0.970
0.9889
0.9958
0.9822
0.9956
0.925
1.201
1.211
1.2386
1.2462
1.2305
1.2468
1.6600
1.546
1.555
1.5834
1.5912
1.5752
0.086957
1.9000
1.785
1.794
1.8223
1.8302
2 - 11.5
0.086957
2.3750
2.259
2.268
2.2963
2.6234
2.1/2 - 8
0.125000
2.8750
2.708
2.727
3.2445
3-8
0.125000
3.5000
3.334
Pitch Dia
Max
Minimum
Minor Dia
–
0.2791
0.2826
0.2505
0.3898
0.362
0.3715
0.3750
0.3429
0.5073
0.5125
0.470
0.4886
0.4938
0.4457
0.5776
0.6444
0.6496
0.607
0.6240
0.6292
0.5811
0.7767
0.7133
0.8008
0.8075
0.753
0.7745
0.7812
0.7180
0.9805
0.9872
0.9238
1.0112
1.0179
0.964
0.9850
0.9917
0.9283
1.161
1.2284
1.2365
1.1600
1.2658
1.2739
1.208
1.2338
1.2420
1.1655
1.5915
1.506
–
–
–
1.6106
1.6187
1.553
–
–
–
1.8142
1.8305
1.745
–
–
–
1.8495
1.8576
1.792
–
–
–
2.3044
2.2881
2.3044
2.219
–
–
–
2.3234
2.3315
2.265
–
–
–
2.7622
2.7720
2.7504
2.7739
2.650
–
–
–
2.8012
2.8129
2.718
–
–
–
3.353
3.3885
3.3984
3.3768
3.4002
3.277
–
–
–
3.4276
3.4393
3.344
–
–
–
–
–
–
3.83750
0.8210
3.88881
3.7374
–
3.1/2 - 8
0.125000
4.0000
3.835
3.848
3.8888
3.8988
3.8771
3.9005
3.777
–
–
–
3.9279
3.9396
3.845
–
–
–
–
–
–
4.33438
0.8440
4.38713
4.2343
–
4-8
0.125000
4.5000
4.333
4.346
4.3871
4.3971
4.3754
4.3988
4.275
–
–
–
4.4262
4.4379
4.343
–
–
–
–
–
–
5.39073
0.9370
5.44929
5.2907
–
5-8
0.125000
5.5630
5.395
5.408
5.4493
5.4598
–
–
–
–
–
–
5.4884
5.5001
5.405
–
–
–
6-8
0.125000
6.6250
6.452
6.464
6.5060
6.5165
–
–
–
–
–
–
6.5450
6.5567
6.462
–
–
–
–
–
–
6.44609
0.9580
6.50597
6.3460
–
*For NPT/NPTF threads 11.5 TPI or finer, the effective internal thread depth is equal to minimum 4 pitches more than L1 and for 8 TPI it is equal to minimum 3 pitches more.
* With large pitches 70% thread engagement may not be within 6H limits
** Small pitches use 5H tolerance
The information on this chart is based on current thread standards at time of printing and is subject to change without notice. Values are listed in the same unit as the thread type. KOMET® GROUP shall have no liability or responsibility from any use of this information. For additional threading information, download our JEL TPT app or call our Threading Tech Line at 1-844-4-THREAD.