Swagelok® Medium-Pressure, Gaugeable Tube Fittings

Swagelok® Medium-Pressure, Gaugeable Tube Fittings

www.swagelok.com
Swage lok ® Medium-Pre ssure, Gauge able
Tube Fit tings and Adapte r Fit tings
For Pre s sure s up to 15 0 0 0 psig (1034 ba r)
■ Easy installation, no special tools required
■ Assembly by one full turn
■ Can also be assembled by torque
■ Leak-tight gas seal with initial installation and with each reassembly
■ Consistent gaugeability upon initial installation
■ Simple two-piece construction, body and cartridge
■ Leak-tight performance on heavy-wall annealed or cold-drawn
1/8-hard stainless steel tubing
Medium-Pressure Gaugeable Tube Fittings and Adapter Fittings
2
Features
The simple two-piece design of the Swagelok® mediumpressure tube fittings and adapters consists of a female
fitting body and preassembled cartridge containing the
male nut and color-coded front and back ferrules on a
disposable plastic arbor. The preassembled cartridge
ensures installers correct ferrule orientation, visual
confirmation of ferrule presence, and proper installation
into the female body. Components are released only
after the nut is threaded finger-tight on the fitting body.
Preassembled
cartridge
Arbor
Female body
Male nut
The Swagelok medium-pressure tube fitting offers a leaktight gas seal and vibration resistance in applications up to
15 000 psig (1034 bar).
Front and back
ferrules
Additional features of this novel tube fitting technology
include:
■ Patented low-temperature case hardening processing
of the ferrules and nut, plus the specially designed
ferrule geometry, promotes a patent-pending hinging
colleting action
■ Robust tube grip for a variety of installation practices
■ Enhanced vibration protection
■ Strain-hardened stainless steel bodies offer lightweight,
space-saving designs
■ Extensive Swagelok product test reports and third-
party test reports
■ 4:1 design factor.
Male nut
Back ferrule
Gaugeable upon
initial installation
by torque or one
full turn
Robust tube grip for a variety
of installation practices and
enhanced vibration protection
Dynamic wedge allows
remakeable pullups
by torque
Female body
Front ferrule
Leak-tight gas seal upon
initial installation and
each remake
3
Medium-Pressure Gaugeable Tube Fittings and Adapter Fittings
Contents
Features ..................................................................................2
Pressure Ratings and Tubing Information .........................4
Materials of Construction.....................................................4
Cleaning and Packaging .......................................................4
Ordering Information and Dimensions
Straight Fittings
90° Elbows
Union, 5
Union, 6
Reducing Union, 6
Reducing Union, 5
Tees
Bulkhead Union, 5
Union, 7
Male Branch, NPT, 7
Male Connector—
Male NPT Thread, 5
Male Connector—Heavy-Duty
Male SAE/MS Straight Thread, 5
Union Cross, 7
Cone and Thread Adapter, 6
Caps and Plugs, 6
All medium-pressure fittings are provided
with a preassembled cartridge containing
the male nut and front and back ferrules
on a disposable plastic arbor, one cartridge
per medium-pressure end connection.
Installation Instructions........................................................8
Replacement Parts .............................................................. 10
Nut and Ferrules Cartridge
Tools and Accessories ........................................................ 10
Gap Inspection Gauge
Pipe Thread Sealants
Preswaging Tool
Tube Benders
Tubing Products
Warranty Information .......................................................... 10
4
Medium-Pressure Gaugeable Tube Fittings and Adapter Fittings
Pressure Ratings and Tubing Information
Pressure ratings are dependent on the end connection
or system component with the lowest pressure rating.
Ratings for the end connections used in this catalog are
identified below.
Swagelok medium-pressure tube fittings listed in this catalog are
rated to the pressure rating of the tubing for typical applications
(see tubing tables below). All pressures are calculated from
equations in ASME B31.3, Process Piping.
Calculations are based on maximum OD and minimum wall
thickness. Pressure rating calculations for cold-drawn 1/8-hard
316 stainless steel tubing are based on an allowable stress
of 35 000 psi (241 MPa).
Pressure Ratings for Swagelok Medium-Pressure Tube Fittings Used
with Heavy-Wall Annealed and Cold-Drawn 1/8-Hard Stainless Steel Tubing
Swagelok medium-pressure ends are rated to the working pressure of the tubing as listed below
and in Swagelok Tubing Data, MS-01-107.
Heavy-Wall Annealed
316 Stainless Steel Tubing➀
Tube
OD
in.
Wall
Thickness
in.
Working
Pressure
psig (bar)
1/4
0.095
15 000 (1034)
3/8
0.134
15 000 (1034)➁
1/2
0.188
15 000 (1034)
➀ No allowance is made for corrosion, erosion, or elevated temperatures.
➁ Pressure rating based on special wall thickness tolerance ± 10 % for
heavy-wall annealed 316 stainless steel tubing.
Suggested Ordering Information
Fully annealed, high-quality type 316 stainless steel tubing
ASTM A269 or A213, or equivalent. Hardness 90 HRB or less.
Tubing to be free of scratches, suitable for bending and flaring.
Heavy-Duty SAE/MS Pressure Ratings
Heavy-duty SAE/MS end connections listed in this catalog
(1/4 and 3/8 in.) are rated to 63 MPa (9137 psi) according to
SAE J1926/2.
Male NPT Pipe End Pressure Ratings➀
Tube
OD
in.
1/4
NPT Male
Pipe Size
in.
1/8
3/8
1/4
1/2
3/8
1/2
Ordering
Number
SS-4FK0-3TTM
SS-4FK0-1-4
SS-6FK0-3TTM
SS-6FK0-1-4
SS-8FK0-1-4
SS-8FK0-3TTM
SS-8FK0-1-8
Pressure
Rating
psig (bar)
10 000 (689)
8 000 (551)
10 000 (689)
➀ No allowance is made for corrosion, erosion, or elevated temperatures.
Cold-Drawn 1/8-Hard
316 Stainless Steel Tubing➀
Tube
OD
in.
Wall
Thickness
in.
1/4
0.065
3/8
0.083
1/2
0.109
Working
Pressure
psig (bar)
15 000 (1034)
➀ No allowance is made for corrosion or erosion.
Suggested Ordering Information
Cold-drawn 1/8-hard high-quality type 316 stainless steel
tubing. OD tolerance ± 0.005 in. and wall thickness tolerance
of ± 10 %. Minimum tensile strength 105 000 psi (723 MPa),
yield strength 75 000 psi (517 MPa), minimum elongation 20 %,
hardness 26 HRC or less. Tubing to be free of scratches,
suitable for bending and flaring.
Swagelok Tubing
For Swagelok heavy-wall annealed and cold-drawn 1/8-hard
tubing products, see the Swagelok Medium-Pressure Tubing
catalog, MS-02-334.
Elevated Temperature Factors
Temperature
°F
300
400
600
800
1000
°C
148
204
315
426
537
Material
316 SS
1.00
0.96
0.85
0.79
0.76
Materials of Construction
Component
Material
Body
Nut➀
Back Ferrule
Front Ferrule
ASTM A276
316 stainless steel
Wetted components listed in italics.
➀ 316 stainless steel with molybdenum disulfide-based lubricant
Cleaning and Packaging
All medium-pressure fittings are cleaned in accordance with
Swagelok standard cleaning and packaging specification
(SC-10), MS-06-62.
All medium-pressure fittings are provided with a preassembled
cartridge containing the male nut and front and back ferrules
on a disposable plastic arbor, one cartridge per mediumpressure end connection.
Medium-Pressure Gaugeable Tube Fittings and Adapter Fittings
5
Ordering Information and Dimensions
All fitting bodies are provided with a preassembled cartridge
containing the male nut and front and back ferrules on a
disposable plastic arbor, one cartridge per medium-pressure
and connection.
Dimensions, in inches (millimeters), are for reference only and
are subject to change. Dimensions are shown with finger-tight
Swagelok nuts.
Straight Fittings
Union
A
D
Fx Flat
D
Tube
OD
in.
Ordering
Number
1/4
SS-4FK0-6
A
2.25 (57.2)
D
1.08 (27.4)
E
0.13 (3.2)
F
5/8
Fx
9/16
3/8
SS-6FK0-6
2.81 (71.5)
1.34 (34.0)
0.21 (5.3)
3/4
11/16
1/2
SS-8FK0-6
3.36 (85.3)
1.59 (40.4)
0.28 (7.1)
1
7/8
F Flat
E
Dimensions, in. (mm)
Reducing Union
A
Tube OD, in.
D
Dx
T
Tx
T
3/8
1/2
G
Flat
F Flat
E
Ordering
Number
Tx
1/4
3/8
Dimensions, in. (mm)
SS-6FK0-6-4
A
D
Dx
2.64 (67.0) 1.34 (34.0) 1.08 (27.4)
SS-8FK0-6-4
2.90 (73.8)
SS-8FK0-6-6
3.19 (81.0)
E
0.13 (3.2)
1.59 (40.4) 1.34 (34.0)
0.21 (5.3)
F
3/4
Fx
11/16
1
7/8
G
9/16
11/16
Fx Flat
Bulkhead Union
A
Dimensions, in. (mm)
D
Fx
Flat
F Flat
E
G Flat
Tube
OD
in.
Ordering
Number
1/4
SS-4FK0-61
A
D
2.25 (57.2) 1.08 (27.4)
E
F
0.13 (3.2) 15/16
3/8
SS-6FK0-61
2.81 (71.5) 1.34 (34.0)
0.21 (5.3) 1 1/16 11/16 1 1/16 57/64
0.66 (16.7)
1/2
SS-8FK0-61
3.38 (85.8) 1.59 (40.4)
0.28 (7.1) 1 5/16
0.75 (19.0)
Fx
9/16
7/8
G
15/16
Panel Maximum
Hole
Panel
Size Thickness
49/64 0.50 (12.7)
1 5/16 1 9/64
Male Connector—Male NPT Thread
A
D
NPT
Tube Male Pipe
OD
Size
in.
in.
E
F Flat
Fx Flat
1/4
3/8
1/2
1/4
1/2
NPT
Maximum
Pressure
Rating
psig (bar)
Dimensions, in. (mm)
Ordering
Number
SS-4FK0-1-4
A
D
1.74 (44.1) 1.08 (27.4)
E
0.13 (3.2)
F
5/8
Fx
9/16
SS-6FK0-1-4
2.03 (51.6) 1.34 (34.0)
0.21 (5.3)
3/4
11/16
SS-8FK0-1-4
2.33 (59.1)
SS-8FK0-1-8
2.52 (64.0)
0.28 (7.1)
1
7/8
1.59 (40.4)
10 000 (689)
8 000 (551)
10 000 (689)
Male Connector—Heavy-Duty Male SAE/MS Straight Thread
A
Dimensions, in. (mm)
D
Tube
OD
in.
E
F Flat
Fx Flat
1/4
3/8
SAE/MS
Thread
Size
Ordering
Number
7/16-20
SS-4FK0-1-4STH
A
1.61 (40.8)
9/16-20
SS-4FK0-1-6STH
1.65 (41.8)
7/16-20
SS-6FK0-1-4STH
1.91 (48.6)
9/16-18
SS-6FK0-1-6STH
1.95 (49.6)
D
E
1.08 (27.4)
0.13 (3.2)
1.34 (34.0)
0.20 (5.2)
0.21 (5.3)
F
5/8
3/4
Fx
SAE/MS
Maximum
Pressure
Rating
psig (bar)
9/16
9137 (629)
11/16
6
Medium-Pressure Gaugeable Tube Fittings and Adapter Fittings
Cone and Thread Adapter
A
D
B
S
E
F Flat
Fx Flat
Tube
OD
in.
Cone and Thread
Tube Size
in.
Ordering
Number
S
Thread
Size
Maximum
Pressure Rating
psig (bar)
1/4
1/4
SS-4FK0-1-4CW
1/4-28 LH
A
2.70 (68.5)
B
0.31 (7.9)
D
E
1.08 (27.4) 0.11 (2.7)
F
5/8
9/16
3/8
3/8
SS-6FK0-1-6CW
3/8-24 LH
3.22 (81.8)
0.39 (9.9)
1.34 (34.0) 0.21 (5.3)
3/4
11/16
1/2
9/16
SS-8FK0-1-9CW
9/16-18 LH
4.04 (102.6) 0.47 (11.9) 1.59 (40.4) 0.28 (7.1)
1
7/8
Dimensions, in. (mm)
Fx
15 000 (1034)
Caps and Plugs
Plugs
Caps
A
A
D
F Flat
Fx Flat
Fx Flat
Tube
OD
in.
Ordering
Number
1/4
SS-4FK0-C
A
1.33 (33.7)
D
1.08 (27.4)
F
5/8
Fx
9/16
3/8
SS-6FK0-C
1.74 (44.2)
1.34 (34.0)
3/4
1/2
SS-8FK0-C
2.05 (52.0)
1.59 (40.4)
1
Dimensions, in. (mm)
Dimensions
in. (mm)
Tube
OD
in.
Ordering
Number
A
Fx
1/4
SS-4FK0-P
1.03 (26.2)
9/16
11/16
3/8
SS-6FK0-P
1.26 (32.0)
11/16
7/8
1/2
SS-8FK0-P
1.45 (36.7)
7/8
90° Elbows
Union
Tube
OD
in.
Ordering
Number
1/4
SS-4FK0-9
A
1.26 (31.9)
D
1.08 (27.4)
E
0.13 (3.2)
F
5/8
Fx
9/16
E
3/8
SS-6FK0-9
1.58 (40.2)
1.34 (34.0)
0.21 (5.3)
3/4
11/16
F Flat
1/2
SS-8FK0-9
1.87 (47.5)
1.59 (40.4)
0.28 (7.1)
1
7/8
A
D
Dimensions, in. (mm)
Fx Flat
Reducing Union
Tube OD, in.
Ax
Tx
T
Fx Flat
1/4
Dx
A
G
Ex
F
Flat
T
E
D
1/2
Tx
3/8
1/2
Dimensions, in. (mm)
Ordering
Number
A
Ax
SS-6FK0-9-4 1.61 (40.9) 1.48 (37.5)
SS-8FK0-9-4
SS-8FK0-9-6
1.91 (48.5)
1.69 (42.8)
D
1.08 (27.4)
1.82 (46.3) 1.34 (34.0)
Dx
1.34 (34.0)
1.59 (40.4)
E
0.13 (3.2)
0.21 (5.3)
Ex
0.21 (5.3)
F
3/4
Fx
11/16
0.28 (7.1)
1
7/8
G
9/16
11/16
Medium-Pressure Gaugeable Tube Fittings and Adapter Fittings
Tees
Union
A
F Flat
D
E
Ax
Tube
OD
in.
Ordering
Number
1/4
SS-4FK0-3
A
2.51 (63.8)
Ax
1.26 (31.9)
D
1.08 (27.4)
E
0.13 (3.2)
F
5/8
Fx
9/16
3/8
SS-6FK0-3
3.17 (80.4)
1.58 (40.2)
1.34 (34.0)
0.21 (5.3)
3/4
11/16
1/2
SS-8FK0-3
3.74 (94.9)
1.87 (47.5)
1.59 (40.4)
0.28 (7.1)
1
7/8
Dimensions, in. (mm)
Fx Flat
Male Branch, NPT
A
Ax
D
H
Fx Flat
F Flat
E
Tube
OD
in.
NPT Male
Pipe Size
in.
Ordering
Number
Dimensions, in. (mm)
1/4
1/8
SS-4FK0-3TTM
A
2.51 (63.8)
Ax
1.26 (31.9)
D
E
H
1.08 (27.4) 0.13 (3.2) 0.78 (19.8)
F
5/8
Fx
9/16
3/8
1/4
SS-6FK0-3TTM
3.17 (80.4)
1.58 (40.2)
1.34 (34.0) 0.21 (5.3) 0.97 (24.6)
3/4
11/16
1/2
3/8
SS-8FK0-3TTM
3.74 (94.9)
1.87 (47.5)
1.59 (40.5) 0.28 (7.1) 1.18 (30.0)
1
7/8
NPT Maximum
Pressure Rating
psig (bar)
10 000 (689)
Union Cross
D
A
F Flat
E
Fx Flat
Tube
OD
in.
Ordering
Number
Dimensions, in. (mm)
1/4
SS-4FK0-4
A
2.51 (63.8)
D
1.08 (27.4)
E
0.13 (3.2)
F
5/8
Fx
9/16
3/8
SS-6FK0-4
3.17 (80.4)
1.34 (34.0)
0.21 (5.3)
3/4
11/16
1/2
SS-8FK0-4
3.74 (94.9)
1.59 (40.5)
0.28 (7.1)
1
7/8
7
8
Medium-Pressure Gaugeable Tube Fittings and Adapter Fittings
Swagelok Instructions for Medium-Pressure Tube Fittings
Installation Instructions
Fig. 1
preassembled
cartridge
1. Thread the preassembled cartridge (nut, ferrules, and
plastic arbor) into the fitting body until finger-tight (Fig. 1).
For temperatures above 400°F (204°C), Silver Goop hightemperature thread lubricant is recommended for use on
fitting nut threads.
body
2. Remove the plastic arbor (Fig. 2).
3. Insert tubing into the fitting (Fig. 3).
Fig. 2
4. Make sure that the tubing rests firmly on the shoulder of
the fitting body (Fig. 4).
plastic
arbor
Fig. 3
fitting
tubing
shoulder
5. Hold the body steady and tighten the nut to the specified
torque (Fig. 5).
Tube Size
in.
1/4
3/8
1/2
Required Torque
ft·lb
25
45
110
N·m
35
60
150
Alternatively, mark the nut, then
tighten the nut one full turn.
Fig. 4
Gaugeability
tubing
On initial installation, the Swagelok medium-pressure gap
inspection gauge assures the installer or inspector that
a fitting has been sufficiently tightened.
Position the Swagelok medium-pressure gap inspection
gauge next to the gap between the nut and body.
Fig. 5
body
■ If the gauge will not enter the gap, the fitting is sufficiently
nut
tightened (Fig. 6).
■ If the gauge will enter the gap, additional tightening is
required.
Fig. 6
body
nut
Swagelok
medium-pressure
gap inspection
gauge
Medium-Pressure Gaugeable Tube Fittings and Adapter Fittings
9
Reassembly Instructions
Fig. 7
tubing with
preswaged
ferrules
body
Fig. 8
nut
Fig. 14
You may disassemble and reassemble the tube fitting
many times.
1. Insert tubing with preswaged ferrules into the
fitting body until the front ferrule seats (Fig. 7, 8).
2. Rotate the nut with a wrench and tighten to the
specified torque in the torque table (Fig. 9).
Alternatively, rotate the nut with a wrench to the
previously pulled-up position; at this point a significant
increase in resistance will be encountered, then
tighten slightly with a wrench.
preswaging
tool
nut
NOTE: Do not use a gap inspection gauge with
reassembled fittings.
Fig. 15
Cap
Fig. 9
Installation Instructions
See medium-pressure tube fitting instructions
(see page 8).
nut
tubing with
preswaged
ferrules
Plug
Installation Instructions
Hold the body steady and tighten the plug to the
specified torque. Alternatively, tighten the plug 1/4
turn from the finger-tight position.
Fig. 10
nut
Fig. 16
Preswaging Tool
preswaging
tool
preassembled
cartridge
Installation Instructions
1. Thread the preassembled cartridge (nut, ferrules,
and plastic arbor) into the preswaging tool until
finger-tight (Fig. 10).
2. Remove the plastic arbor (Fig. 11).
tubing with
preswaged
ferrules
body
3. Insert the tubing into the preswaging tool (Fig. 12).
Fig. 11
plastic
arbor
Fig. 12
preswaging
tool
tubing
Fig. 13
shoulder
tubing
4. Make sure that the tubing rests firmly on the shoulder
of the preswaging tool body (Fig. 13).
5. Hold the preswaging tool steady and tighten the
nut to the specified torque (Fig. 14). Alternatively,
mark the nut and tighten the nut 3/4 turn.
6. Loosen the nut.
7. Remove the tubing with preswaged ferrules from
the preswaging tool (Fig. 15). NOTE: If the tubing
sticks in the preswaging tool, remove the tubing
by gently rocking it back and forth. Do not turn
the tubing.
8. Insert tubing with preswaged ferrules into the
fitting body until the front ferrule seats (Fig. 16).
9. Rotate the nut with a wrench and tighten to the
specified torque (Fig. 17).
NOTE: Do not use a gap inspection gauge with fittings
that were assembled using the preswaging tool.
Fig. 17
nut
Replacement Parts
Nut and Ferrules Cartridge
To order replacement ferrules and nut, see ordering
information below. Each cartridge contains a front ferrule,
back ferrule, and male nut.

Do not use medium-pressure nut and ferrules with
any other Swagelok tube fittings.
H
D
Tube
OD
in.
Ordering
Number
1/4
SS-4FK-NFSET
D
0.69 (17.5)
H
1.43 (36.4)
3/8
SS-6FK-NFSET
0.81 (20.6)
1.72 (43.6)
1/2
SS-8FK-NFSET
1.00 (25.4)
1.97 (49.9)
Dimensions, in. (mm)
Tools and Accessories
Medium-Pressure
Gap Inspection Gauge
The Swagelok medium-pressure gap
inspection gauge assures the installer
or inspector that the fitting has been
sufficiently pulled up on initial installation,
whether using torque wrench or standard
wrench tightening.
Preswaging Tool
For Swagelok tube fitting installations in close quarters,
the Swagelok preswaging tool is a convenient accessory.
Ordering Number: MS-IG-FK0

The medium-pressure gap inspection gauge is
different than the gap gauge for all other Swagelok
tube fittings.
Pipe Thread Sealants
A thread sealant should always be used
when assembling tapered threads.
SWAK® anaerobic pipe thread
sealant and Swagelok PTFE
tape are available. See the
Swagelok Tools and Accessories
catalog, MS-01-169.
Safe Product Selection
When selecting a product, the total system design must
be considered to ensure safe, trouble-free performance.
Function, material compatibility, adequate ratings,
proper installation, operation, and maintenance are the
responsibilities of the system designer and user.
Caution: Do not mix or interchange parts with those of
other manufacturers.
Size
in.
Ordering
Number
1/4
MS-ST-4FK0
3/8
MS-ST-6FK0
1/2
MS-ST-8FK0
Tube Benders
For tube benders, see the
Swagelok Tools and Accessories
catalog, MS-01-169.
Tubing Products
Swagelok offers mediumpressure tubing. For more
information about heavy-wall
annealed and cold-drawn 1/8hard stainless steel tubing, see
the Swagelok Medium-Pressure Tubing
catalog, MS-02-334.
Warranty Information
Swagelok products are backed by The Swagelok Limited
Lifetime Warranty. For a copy, visit swagelok.com or contact
your authorized Swagelok representative.
Swagelok—TM Swagelok Company
© 2006 Swagelok Company
Printed in U.S.A., GLI
April 2006, R0
MS-02-335