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We ld F i tti n gs
Ultrahigh-Purity, Specially Cleaned, and Industrial

1/8 to 1 in. and 6 to 18 mm

316, 316L, 316L VAR, and 316L VIM-VAR stainless steel materials
Fittings for manual or automatic welding equipment

Weld Fittings

Cleaning and Packaging

Contents

Standard

Materials of Construction . . . . . . . . . . . . . . . . . . . . . . . 2
Cleaning and Packaging . . . . . . . . . . . . . . . . . . . . . . . . . 2
Pressure Ratings Basis . . . . . . . . . . . . . . . . . . . . . . . . . 3
Micro-Fit (Miniature Tube Butt Weld) Fittings . . . . . . . 3
Tube Butt Weld Fittings . . . . . . . . . . . . . . . . . . . . . . . . . 6
Automatic Tube Butt Weld Fittings . . . . . . . . . . . . . . . . 9
Automatic Tube Socket Weld Fittings . . . . . . . . . . . . . . 12
Tube Socket Weld Fittings . . . . . . . . . . . . . . . . . . . . . . . 13
Pipe Socket Weld Fittings . . . . . . . . . . . . . . . . . . . . . . . 15
Pipe Butt Weld Fittings . . . . . . . . . . . . . . . . . . . . . . . . . 16
Swagelok Orbital Welding System . . . . . . . . . . . . . . . 16

Specifications

Bar Stock
SS

316L stainless steel

316L

316L VIM-VAR
stainless steel

6LV

ASTM A479/ASME SA479

and ASTM A276
SEMI F200305
Ultrahigh-Purity

Forgings
316 stainless steel

SS

316L stainless steel

316L

Weld fittings are available cleaned and packaged in

accordance with Swagelok Special Cleaning and Packaging
(SC11), MS0663, to ensure compliance with product
cleanliness requirements as stated in ASTM G93 Level C. To
order, add SC11 to the ordering number.
Example: 6LV-4MW-6-2-SC11

Photovoltaic (SC06)
Select weld fittings are available cleaned and packaged
in accordance with Swagelok Photovoltaic Process
Specification (SC06), MS0664, to meet the process
requirements of solar cell production. To order, add -SC06 to
the ordering number.
Example: 6LV-4MW-6-2-SC06

Example: 6LV-4MW-6-2-P6

Designator

316 stainless steel

Special (SC11)

SC-06cleaned weld fittings are available with controlled

surface finishes and electropolishing. Wetted surfaces
are finished to 5 in. (0.13m) Ra. To order, add -P6 to the
ordering number.

Materials of Construction
Material

Weld fittings are cleaned in accordance with Swagelok

Standard Cleaning and Packaging (SC-10), MS-06-62.

ASTM A182/ASME SA182

and ASTM A314

Includes straight configurations and all Micro-Fit weld fittings.

Straight Micro-Fit configurations are 316L VAR stainless steel/SEMI
F200305 High-Purity, 20% minimum elongation allowed.
20% minimum elongation allowed.
Includes all elbows, crosses, and tees, excluding Micro-Fit weld fittings.

Additional Considerations
Consult ASME Boiler and Pressure Vessel Code, ASMEB31.1,
ASMEB31.3, or other applicable codes for information on
weld setup, technique, and additional considerations for
welded systems.
The choice of fitting, pipe, and tubing material being welded
is critical. Using the same materials will ensure the same
coefficients of expansion and will reduce the possibility of
poor welds, out-of-roundness, or dimensional changes that
are detrimental to a good weld.

Threaded End Connections

Pipe threads are based on the requirements of ASME B1.2.0.1
(NPT) and SAE AS71051 (ANPT) for tapered pipe threads.

Ultrahigh-Purity (SC01)
Select weld fittings are available with controlled surface
finishes, electropolished, and specially cleaned. Wetted
surfaces are finished to 5 in. (0.13 m) Ra. For more
information, see Swagelok Ultrahigh-Purity Process
Specification (SC-01), MS-06-61. To order, add -P to the
ordering number.
Example: 6LV-4MW-6-2-P

Cleaning Process Availability

Fitting Type
Micro-Fit (miniature
tube butt weld)

Cleaning Process (Designator)

UltrahighPhotovoltaic
Special
Purity
(-SC11 )
(-SC06)
(-P6)
(-P)

Tube butt weld

Automatic tube
butt weld

Automatic tube
socket weld

Tube socket weld

Pipe socket weld

Pipe butt weld

Oxygen Service Hazards

For more information about hazards and risks of oxygenenriched systems, see the Swagelok Oxygen System Safety
Technical Report, MS0613.

Weld Fittings

Pressure Ratings Basis

Catalog pressure ratings shown are for temperatures from
20 to 100F (28 to 37C), which are based on an allowable
stress value of 20 000 psi (1378 bar) in accordance with
ASMEB31.3 and ASMEB31.1 for 316 stainless steel. 316L
stainless steel material is controlled in accordance with
Swagelok material specifications and possesses minimum
room temperature tensile and yield strengths equivalent to
316 stainless steel.

Material Type

316 SS

Temperature, F (C)

Pressure derating factors for applications at temperatures

greater than 100F (37C) were determined from these
pressure codes and are listed in the table at right.

316L SS
Factor

20 (28) to 100 (37)

1.00

1.00

200 (93)

1.00

0.83

400 (204)

0.96

0.77

600 (315)

0.85

0.67

800 (426)

0.79

0.62

1000 (537)

0.76

0.56

Examples:

Elevated-Temperature Factors

A 1/4 in. 316L VIM-VAR reducing union has a pressure rating

of 5100 psig (351 bar), as shown in the table below. To obtain
the pressure rating at 400F (204C), multiply 5100 psig
(351bar) by 0.77:
5100 psig (351 bar) 0.77 = 3927 psig (270 bar)

To determine elevated-temperature pressure ratings in

accordance with B31.3 and B31.1, multiply the pressure
ratings provided in the ordering number tables on the pages
that follow by the factors in the table at right.

A 1/4 in. 316 SS tube socket weld union has a pressure rating
of 10 700 psig (737 bar), as shown in the table on page13.
To obtain the pressure rating at 400F (204C), multiply
10700psig (737 bar) by 0.96:
10700psig (737 bar) 0.96 = 10 272 psig (707 bar)
Alternative elevated-temperature factors may be chosen from
ASME B31.3 or B31.1 at the users discretion.

Micro-Fit (Miniature Tube Butt Weld) Fittings

Compact Design
Accommodates
Allows

Rounded body block helps prevent

damage to other components during
system fabrication or maintenance.

tubing systems requiring miniaturization

close component spacing

Provides

Marking identifies
manufacturer, material,
and, when applicable,
ultrahigh-purity
cleaning.

flow and service ratings equal to larger weld

fittings.
Material heat code
is roll stamped to
ensure raw material
traceability.

Ordering Information and Dimensions

Dimensions are for reference only and are subject to

change.
See Cleaning and Packaging, page 2, to order Micro-Fit

weld fittings cleaned in accordance with Swagelok Special

Cleaning and Packaging (SC-11), MS0663; Photovoltaic
Process Specification (SC06), MS0664; or UltrahighPurity Process Specification (SC-01), MS-06-61.

Reducing Union
B
B1

Ultrahigh-purity cleaning
with 5 in. (0.13 m) Ra surface
finish is available. Standard surface
finish is 10 in. (0.25 m) Ra.
Square, sharp, burrfree tube weld ends
enhance alignment,
maintain tube wall
uniformity, and promote
weld repeatability.

Ordering
Number

Radiused junction
allows for a smooth
flow transition and
eliminates pockets
and entrapment
zones.

Dimensions

Tube
OD

Wall
Thickness

Tube
OD

Wall
Thickness

1/4

0.035

1/8

0.028

6LV-4MW-6-2

3/8

0.035

1/4

0.035

6LV-6MW-6-4

0.75

0.42

0.25

3300 (227)

6LV-8MW-6-4

(19.0)

(10.7)

(6.4)

3700 (254)

B1

Dimensions, in. (mm)

1/2

0.049

1/4
3/8

0.035

6LV-8MW-6-6

Pressure
Rating
psig (bar)
5100 (351)

3300 (227)

Weld Fittings

Micro-Fit (Miniature Tube Butt Weld) Fittings

90 Union Elbow
L

A
F flat

Dimensions

Tube
OD

Wall
Thickness

Ordering
Number

1/8

0.028

6LV-2MW-9

1/4

0.035

6LV-4MW-9

3/8

0.035

6LV-6MW-9

0.69 (17.5)

1/2

0.049

6LV-8MW-9

0.81 (20.6)

Pressure
Rating

Dimensions, in. (mm)

psig (bar)

0.56 (14.2)
0.25 (6.4)

5/16

0.41 (10.4) 8500 (585)

5/16

0.41 (10.4) 5100 (351)

7/16

0.47 (11.9) 3300 (227)

9/16

0.53 (13.5) 3700 (254)

(5/16)

10.4 (0.41) 420 (6095)

(7/16)

11.9 (0.47) 310 (4499)

(7/16)

11.9 (0.47) 240 (3483)

(9/16)

13.5 (0.53) 200 (2902)

Dimensions, mm (in.)
6
8
10

6LV-6MMW-9
1.0

12

Reducing 90
Union Elbow

Tube
OD

Wall
Thickness

6LV-8MMW-9

17.5 (0.69)

6LV-10MMW-9

17.5 (0.69)

6LV-12MMW-9

20.6 (0.81)

Tube
OD

Wall
Thickness

6.4 (0.25)

Dimensions

Ordering
Number

3/8

0.035

1/4

0.035

0.049

0.81

10

17.5
17.5
(0.69)

1.0

Tube
OD

L1

9/16

Wall
Thickness

1/4

(7/16)

6.4

20.6

(9/16)

(0.81)

6LV-12MMW-9-8M

A1

(20.6)

0.035

0.53

(254)

3300

11.9

bar (psig)
310

(0.47)

(4499)

11.9

240

(0.47)

(3483)

13.5

200

(0.53)

(2902)

B1

L1

Pressure
Rating
psig (bar)

0.45

0.61

(11.4)

0.41

0.50

(10.4)

(12.7)

5/16

(15.5)

0.66
(16.8)

6LV-4MW-9-03444

0.76 (19.3)

0.45 (11.4)

0.61 (15.5)

6LV-4MW-9-03445

0.81 (20.6)

0.50 (12.7)

0.66 (16.8)

B1

45 Union Elbow

Dimensions

Tube
OD

Wall
Thickness

Ordering
Number

1/4

0.035

6LV-4MW-5

3/8

0.035

6LV-6MW-5

0.56 (14.2)

1/2

0.049

6LV-8MW-5

0.64 (16.3)

Dimensions, in. (mm)

0.47 (11.9)
0.25 (6.4)

(227)

(13.5)

Dimensions

Ordering
Number

Dimensions, in. (mm)

0.76
6LV-4MW-9-03442
0.56 (19.3) 0.25
(14.2)
(6.4)
0.81
6LV-4MW-9-03443
A1

(11.9)

(0.25)

6LV-12MMW-9-6M

12

F flat

psig (bar)
3300
3700

(7/16)

(0.69)

6LV-10MMW-9-6M

0.47

(227)

6LV-8MMW-9-6M

1.0

A
L

Pressure
Rating

Dimensions, mm (in.)
8

Extended Leg
90 Union Elbow

(6.4)

(20.6)

6LV-8MW-9-6

F flat

F flat

0.25

6LV-8MW-9-4

3/8

7/16

(17.5)

0.035

0.69

6LV-6MW-9-4

1/4
1/2

Dimensions, in. (mm)

bar (psig)

14.2 (0.56)

Pressure
Rating
psig (bar)

5/16

0.41 (10.4) 5100 (351)

7/16

0.47 (11.9) 3300 (227)

9/16

0.53 (13.5) 3700 (254)

5100
(351)

Weld Fittings

Micro-Fit (Miniature Tube Butt Weld) Fittings

Union Tee
A

F flat

Dimensions

Tube
OD

Wall
Thickness

Ordering
Number

1/8

0.028

6LV-2MW-3

1/4

0.035

6LV-4MW-3

3/8

0.035

6LV-6MW-3

0.94 (23.9)

1/2

0.049

6LV-8MW-3

1.06 (26.9)

Pressure
Rating

Dimensions, in. (mm)

psig (bar)

0.82 (20.8)
0.25 (6.4)

5/16

0.41 (10.4) 8500 (585)

5/16

0.41 (10.4) 5100 (351)

7/16

0.47 (11.9) 3300 (227)

9/16

0.53 (13.5) 3700 (254)

(5/16)

10.4 (0.41) 420 (6095)

(7/16)

11.9 (0.47) 310 (4499)

(7/16)

11.9 (0.47) 240 (3483)

(9/16)

13.5 (0.53) 200 (2902)

Dimensions, mm (in.)
6
8

1.0

10
12

Extended Branch Leg

Union Tee
B

Tube
OD

B1

L1

0.035

23.9 (0.94)
23.9 (0.94)

6LV-12MMW-3

26.9 (1.06)

Ordering
Number

6.4 (0.25)

Dimensions
A

A1

Dimensions, in. (mm)

0.82 0.76 0.25
6LV-4MW-3-03446
(20.8)

Tube
Wall
OD Thickness

L1

B1

F flat

6LV-8MMW-3
6LV-10MMW-3

bar (psig)

B1
0.45

(19.3)

(6.4)

(11.4)

A1

1/4

A1

0.035

Ordering
Number

F flat

Dimensions, in. (mm)

1.96 0.56 0.83
6LV-4MW-3-03921

(49.8) (14.2) (21.1)

Pressure
Rating

0.41

0.61

psig (bar)
5100

5/16

(10.4)

(15.5)

(351)

B1

L1

Pressure
Rating

0.98

0.41

psig (bar)
5100

0.25
(6.4)

5/16

(24.9) (10.4)

Ordering
Number

Dimensions
A

Pressure
Rating

0.47

psig (bar)
3300

Dimensions, in. (mm)

0.035

1/4
1/4

1/2

(351)

There may be a slight mismatch between run ends at drill intersection.

Tube
Wall
Tube
Wall
OD Thickness OD Thickness
3/8

L1

Dimensions

Reducing Tee
A

A1

Extended Run Leg Union Tee

L

20.8 (0.82)

Wall
Thickness

1/4

F flat

6LV-6MMW-3

6LV-6MW-3-6-4
0.035

6LV-8MW-3-8-4

0.049
3/8

6LV-8MW-3-8-6

0.94

7/16

(23.9)

(11.9)

0.25
1.06

(6.4)

(26.9)

9/16

0.53

(254)

(13.5)

3300

11.9

bar (psig)
240

(0.47)

(3483)

(227)

Dimensions, mm (in.)
10

6
1.0

6LV-10MMW-3-10M-6M
1.0

6LV-12MMW-3-12M-6M

12
8

6LV-12MMW-3-12M-8M

(227)

3700

23.9

(7/16)

(0.94)

6.4
26.9
(1.06)

(0.25)

(9/16)

13.5

200

(0.53)

(2902)

Weld Fittings

Micro-Fit (Miniature Tube Butt Weld) Fittings

Union Cross
A

Tube
OD

Wall
Thickness

1/8

0.028

6LV-2MW-4

1/4

0.035

6LV-4MW-4

Pressure
Rating

Dimensions, in. (mm)

F flat

Dimensions

Ordering
Number

psig (bar)
5/16

0.41 (10.4) 8500 (585)

5/16

0.41 (10.4) 5100 (351)

7/16

0.47 (11.9) 3300 (227)

9/16

0.53 (13.5) 3700 (254)

(5/16)

10.4 (0.41) 420 (6095)

(7/16)

11.9 (0.47) 310 (4499)

(7/16)

11.9 (0.47) 240 (3483)

(9/16)

13.5 (0.53) 200 (2902)

0.82 (20.8)

3/8

0.035

6LV-6MW-4

0.94 (23.9)

1/2

0.049

6LV-8MW-4

1.06 (26.9)

0.25 (6.4)

Dimensions, mm (in.)
6

6LV-6MMW-4

6LV-8MMW-4

1.0

10

Tribow

Tube
OD

6LV-12MMW-4

26.9 (1.06)

Wall
Thickness

Ordering
Number

1/4
F
flat

0.035

3/8

0.035

1/2

This unique design has weld ends in three

planes at 90 to each other. It permits greater
flexibility in designing systems, especially
where space is limited.

23.9 (0.94)

6LV-10MMW-4

12

0.049

1.0

bar (psig)

20.6 (0.81)
6.4 (0.25)

Dimensions
A

Dimensions, in. (mm)

0.56
6LV-4MW-91

5/16

(14.2)

6LV-6MW-91
6LV-8MW-91

0.69

0.25

(17.5)

(6.4)

0.81

7/16
9/16

(20.6)

Dimensions, mm (in.)
14.2
6LV-6MMW-91

6.4

(0.56)

(0.25)

(5/16)

Pressure
Rating

0.41

psig (bar)
5100

(10.4)

(351)

0.47

3300

(11.9)

(227)

0.53

3700

(13.5)

(254)

10.4

bar (psig)
420

(0.41)

(6095)

Tube ends are machined with

a square face and corners
to enhance alignment and
maintain tube wall uniformity.

Tube Butt Weld Fittings

Ordering Information and Dimensions
Dimensions are for reference only and are subject to

change.
See Cleaning and Packaging, page 2, to order tube butt

weld fittings cleaned in accordance with Swagelok Special

Cleaning and Packaging (SC-11), MS0663; Photovoltaic
Process Specification (SC06), MS0664; or UltrahighPurity Process Specification (SC-01), MS-06-61.

90 Union Elbow
B

Tube
OD

Wall
Thickness

1/4

0.035

316L-4TB7-9

3/8

0.035

316L-6TB7-9

1/2

0.049

316L-8TB7-9

3/4

0.049

316L-12TB7-9

1.0

316L-6MTB7-9

F flat

Standard surface finish is

average 10 in. (0.25m)
Ra. Controlled surface
finish is available for
ultrahigh-purity systems.

Ordering
Number

Dimensions
B

Dimensions, in. (mm)

0.75 (19.0)

1.0

316L-8MTB7-9

10

1.0

316L-10MTB7-9

12

1.0

18

1.5

Pressure
Rating
psig (bar)

7/16

1.23 (31.2) 5100 (351)

7/16

1.20 (30.5) 3300 (227)

11/16

1.34 (34.0) 3700 (254)

15/16

1.46 (37.1) 2400 (165)

(7/16)

31.2 (1.23) 420 (6095)

Dimensions, mm (in.)
6

Precisely finished diameter

matches tube diameter.

bar (psig)
(7/16)

31.2 (1.23) 310 (4499)

(11/16)

34.0 (1.34) 240 (3483)

316L-12MTB7-9

(11/16)

34.0 (1.34) 200 (2902)

316L-18MTB7-9

(15/16)

37.6 (1.48) 200 (2902)

19.0 (0.75)

Weld Fittings

Tube Butt Weld Fittings

Reducing Union

Tube
OD

Wall
Thickness

Tube
OD

Wall
Thickness

3/8

0.035

1/4

0.035

1/2

0.049

3/4

0.049

Dimensions

Ordering
Number

Dimensions, in. (mm)

0.065

1/4
3/8
1/2
1/2
3/4

0.035
0.049
0.049

psig (bar)

316L-6TB7-6-4

3300 (227)

316L-8TB7-6-4

3700 (254)

316L-8TB7-6-6

1.50

0.75

3300 (227)

316L-12TB7-6-8

(38.1)

(19.0)

2400 (165)

316L-16TB7-6-8

2400 (165)

316L-16TB7-6-12

Dimensions, mm (in.)
10

1.0

6
8

1.0

6
12

1.0

8
10

Union Tee
L
F flat

A
B

240 (3483)

316L-10MTB7-6-8M
316L-12MTB7-6-8M
316L-12MTB7-6-10M

1.5

1.5

Tube
OD

Wall
Thickness

1/4

0.035

316L-4TB7-3

2.46 (62.5)

3/8

0.035

316L-6TB7-3

2.40 (61.0)

Ordering
Number

38.1

19.0

(1.50)

(0.75)

316L-18MTB7-6-6M

18

12

bar (psig)

316L-10MTB7-6-6M
316L-12MTB7-6-6M

1.0

Dimensions
A

1/2

0.049

316L-8TB7-3

2.68 (68.1)

3/4

0.049

316L-12TB7-3

2.91 (73.9)

316L-6MTB7-3

1.0

316L-8MTB7-3

62.5 (2.46)

1.0

316L-10MTB7-3

67.8 (2.67)

12

1.0

316L-12MTB7-3

67.8 (2.67)

18

1.5

316L-18MTB7-3

74.9 (2.95)

Pressure
Rating
psig (bar)

1.23 (31.2) 5100 (351)

0.75

7/16

1.20 (30.5) 3300 (227)

(19.0)

11/16

1.34 (34.0) 3700 (254)

15/16

1.46 (37.1) 2400 (165)

(7/16)

31.2 (1.23) 420 (6095)

bar (psig)

62.5 (2.46)

10

7/16

Dimensions, mm (in.)
1.0

200 (2902)

200 (2902)

316L-18MTB7-6-12M

Dimensions, in. (mm)

Pressure
Rating

19.0
(0.75)

(7/16)

31.2 (1.23) 310 (4499)

(11/16)

34.0 (1.34) 240 (3483)

(11/16)

34.0 (1.34) 200 (2902)

(15/16)

37.6 (1.48) 200 (2902)

Weld Fittings

Tube Butt Weld Fittings

Reducing Tee
L
F flat

Tube
Wall
Tube
Wall
OD Thickness OD Thickness

Dimensions

Ordering
Number

L1

Pressure
Rating

1.20

1.23

psig (bar)
3300

Dimensions, in. (mm)

3/8

0.035

1/4

316L-6TB7-3-6-4

1/4

L1

1/2

3/8

316L-8TB7-3-8-4
0.035

3/8

2.67
(67.8)

316L-8TB7-3-8-6

0.75

11/16

(30.5) (31.2)

(227)

1.34

3700

1.34 (34.0)
1.35

3300

(34.3)

(227)

(34.0)

(19.0)

316L-12TB7-3-12-6

2.91

15/16

(73.9)

316L-12TB7-3-12-4

1.46 (34.3)
1.48

(37.1)

316L-8MTB7-3-8M-6M

316L-10MTB7-3-10M-6M

62.2

1.0

(2.67)

316L-12MTB7-3-12M-6M

316L-12MTB7-3-12M-8M

Tube
OD

Wall
Thickness

1/4

0.035

Ordering
Number

19.0

67.8

F flat

7/16

1.23 (31.2) 5100 (351)

0.035

316L-6TB7-4

2.39 (60.7) 0.75 (19.0)

7/16

1.20 (30.5) 3300 (227)

0.049

316L-8TB7-4

2.61 (66.3) 0.75 (19.0)

11/16

1.34 (34.0) 3700 (254)

(7/16)

31.3 (1.23) 420 (6095)

(7/16)

31.3 (1.23) 310 (4499)

(5/8)

34.0 (1.34) 240 (3483)

(5/8)

34.0 (1.34) 200 (2902)

1.0

ATW Weld Ring

ATW weld rings are used with tube butt
weld fittings. The ring helps align weld
joints and adds material to the weld
zone during manual or orbital welding.

62.2 (2.45)

316L-8MTB7-4

62.2 (2.45)

bar (psig)

19.0 (0.75)

316L-12MTB7-4 64.8 (2.55)

Tube
OD
1/4
3/8
1/2

316L-6MTB7-4

316L-10MTB7-4 64.8 (2.55)

12

M typical

Pressure
Rating

3/8

10

Tx

34.0 (1.34)

psig (bar)

2.45 (62.2) 0.75 (19.0)

Dimensions, mm (in.)

34.0 (1.34)

1/2
6

Ordering
Number

Dimensions
E

Dimensions, in. (mm)

0.20
316L-4-ATW-R

316L-8-ATW-R

Tx
0.28

(5.1)

316L-6-ATW-R

bar (psig)
310
(4499)

(7.1)

0.32

0.02

0.01

0.41

(8.1)

(0.51)

(0.25)

(10.4)

0.42

0.54

(10.7)

(13.7)

(3483)

200
(2902)

(11/16)

(2.67)

Dimensions, in. (mm)

316L-4TB7-4

(11/16)

Dimensions
A

31.3 (1.23)

(0.75)

12

Union Cross

(165)

240
67.8

316L-10MTB7-3-10M-8M

(7/16)

(2.45)

10
1.0

2400

(37.6)

Dimensions, mm (in.)
8

(254)

1.35

0.049
1/4

7/16

(60.7)

0.049

3/4

2.39

200
(2902)

Weld Fittings

Automatic Tube Butt Weld Fittings

Precisely finished diameter

matches tube diameter.

Ordering Information and Dimensions

Dimensions are for reference only and are subject to

change.
Standard surface finish is
average 10 in. (0.25m)
Ra. Controlled surface
finish is available for
ultrahigh-purity systems.

See Cleaning and Packaging, page 2, to order

automatic tube butt weld fittings cleaned in accordance

with Swagelok Special Cleaning and Packaging (SC11),
MS0663; Photovoltaic Process Specification (SC06),
MS0664; or Ultrahigh-Purity Process Specification
(SC01), MS-06-61.

Locator Union
A

Tube
OD
B

1/4
3/8

Union
A

Dimensions

Ordering
Number

Dimensions, in. (mm)

1.69
316L-4-ATW-6L

D
Tx

Wall
Thickness

Integral filler ring aids in alignment.

0.035

(42.9)

0.035

316L-6-ATW-6L
316L-8-ATW-6L

Tx

Pressure
Rating

0.02

0.36

0.29

psig (bar)
5100

(0.51)

(9.1)

(7.4)

(351)

1.71

0.75

0.03

0.42

0.41

3300

(43.4)

(19.0)

(0.76)

(10.7)

(10.4)

(227)

1.73

0.04

0.60

0.55

3700

(43.9)

(1.0)

(15.2)

(14.0)

(254)

1/2

0.049

Tube
OD

Wall
Thickness

1/4

0.035

316L-4-ATW-6

1.00 (25.4) 0.02 (0.51) 0.29 (7.4)

3/8

0.035

316L-6-ATW-6

1.00 (25.4) 0.03 (0.76) 0.41 (10.4) 3300 (227)

1/2

0.049

316L-8-ATW-6

1.00 (25.4) 0.04 (1.0)

0.55 (14.0) 3700 (254)

3/4

0.049

316L-12-ATW-6

1.00 (25.4) 0.04 (1.0)

0.80 (20.3) 2400 (165)

0.065

316L-16-ATW-6

1.25 (31.8) 0.04 (1.0)

1.06 (26.9) 2400 (165)

Dimensions

Ordering
Number

Pressure
Rating

Tx

Dimensions, in. (mm)

Tx

psig (bar)
5100 (351)

Dimensions, mm (in.)

Reducing Union
A

D
Tx

1.0

316L-6-MATW-6

0.51 (0.02) 6.9 (0.27)

420 (6095)

1.0

316L-8-MATW-6

0.76 (0.03) 8.9 (0.35)

310 (4499)

10

1.0

316L-10-MATW-6

0.76 (0.03) 10.9 (0.43)

240 (3483)

12

1.0

316L-12-MATW-6

1.0 (0.04) 13.2 (0.52)

200 (2902)

18

1.5

316L-18-MATW-6

1.0 (0.04) 19.3 (0.76)

200 (2902)

Tube
Wall
Tube
Wall
OD Thickness OD Thickness
D1
Tx1

bar (psig)

31.8 (1.25)

Ordering
Number

Dimensions
Tx1

Pressure
Rating

1.58 0.75 0.03 0.02 0.41 0.29

psig (bar)
3300

D1

Tx

Dimensions, in. (mm)

3/8

0.035

1/4

0.035

1/4
1/2

0.049

316L-8-ATW-6-4
0.035

3/8
3/4

0.049

316L-6-ATW-6-4

1/2

316L-8-ATW-6-6
0.049

316L-12-ATW-6-8

(40.1) (19.0) (0.76) (0.51) (10.4)

(7.4)

(227)

0.29

3700

1.58 0.75 0.04 (0.51) 0.55 (7.4)

(1.0) 0.03 (14.0) 0.41

3300

0.02
(40.1) (19.0)

(0.76)

(10.4)

(227)

1.62 0.75 0.04 0.04 0.80 0.55

2400

(41.1) (19.0)

(1.0)

(1.0)

(20.3) (14.0)

Dimensions, mm (in.)
8

6
1.0

316L-8-MATW-6-6M
1.0

316L-12-MATW-6-6M

12
8

316L-12-MATW-6-8M

(254)

39.9

0.76 0.51

(1.57)

(0.03) (0.02) (0.35) (0.27)

40.1 19.0
(1.58) (0.75)

40.4
(1.59)

0.51

8.9

6.8

(165)

bar (psig)
310
(4499)

6.8

1.0 (0.02) 13.2 (0.27)

(0.04) 0.76 (0.52) 8.9
(0.03)
(0.35)

200
(2902)

10

Weld Fittings

Automatic Tube Butt Weld Fittings

Swagelok Tube Fitting
to Automatic Tube
Weld Connector

Tube
OD

A
D

1/4

D1

3/8

Tx

1/2

90 Union Elbow
D

Tube
OD

Tube
OD

Wall
Thickness

1/4

0.035

3/8

0.035

1/2

0.049

Wall
Thickness

1/4

0.035

3/8

0.035

1/2

316L-8-ATW-6-810

316L-12-ATW-9

0.065

316L-16-ATW-9

D1

Tx

Pressure
Rating

0.60

0.02

0.29

psig (bar)
5100

(15.2)

(0.51)

(7.4)

(351)

1.84

0.75

0.66

0.03

0.41

3300

(46.7)

(19.0)

(16.8)

(0.76)

(10.4)

(227)

1.99

0.90

0.04

0.55

3700

(50.5)

(22.9)

(1.0)

(14.0)

(254)

Dimensions

Ordering
Number

316L-8-ATW-9

0.049

(44.2)

316L-6-ATW-6-600

Dimensions, in. (mm)

1.74
316L-4-ATW-6-400

316L-6-ATW-9

0.049

3/4

Dimensions, in. (mm)

0.02
0.75
316L-4-ATW-9

F flat

Tx

Dimensions

Ordering
Number

(19.0)

(0.51)

0.75

0.03

(19.0)

(0.76)

0.75

0.04

(19.0)

(1.0)

0.75

0.04

(19.0)

(1.0)

0.96

0.04

(24.4)

(1.0)

Tx

Pressure
Rating

1.25

0.29

psig (bar)
5100

F
7/16
7/16
11/16
15/16
1 1/4

(31.8)

(7.4)

(351)

1.23

0.41

3300

(31.2)

(10.4)

(227)

1.38

0.55

3700

(35.1)

(14.0)

(254)

1.50

0.80

2400

(38.1)

(20.3)

(165)

1.89

1.06

2400

(48.0)

(26.9)

(165)

Dimensions, mm (in.)
6

1.0

316L-8-MATW-9

10

1.0

316L-10-MATW-9

12

1.0

316L-12-MATW-9

18

1.5

316L-18-MATW-9

Tube
OD

Tx

Wall
Thickness

0.51

316L-6-MATW-9

Union Tee
L
F flat

1.0

(0.02)

0.76
(0.03)

19.0

0.76

(0.75)

(0.03)

Ordering
Number

1.0
(0.04)

1.0
(0.04)

(7/16)
(7/16)
(11/16)
(11/16)
(15/16)

1/4

0.035

3/8

0.035

316L-6-ATW-3

1/2

0.049

316L-8-ATW-3

3/4

0.049

316L-12-ATW-3

0.065

316L-16-ATW-3

1.0
1.0

316L-8-MATW-3

10

1.0

316L-10-MATW-3

12

1.0

316L-12-MATW-3

18

1.5

316L-18-MATW-3

(0.27)

(5100)

32.0

8.9

227

(1.26)

(0.35)

(3300)

34.8

10.9

254

(1.37)

(0.43)

(3700)

35.1

13.2

199

(1.38)

(0.52)

(2888)

38.6

19.3

206

(1.52)

(0.76)

(2989)

D
0.02

(63.5)

(19.0)

(0.51)

2.46

0.75

0.03

(62.5)

(19.0)

(0.76)

2.76

0.75

0.04

(70.1)

(19.0)

(1.0)

3.00

0.75

0.04

(76.2)

(19.0)

(1.0)

3.78

0.96

0.04

(96.0)

(24.4)

(1.0)

Dimensions, mm (in.)
63.5
316L-6-MATW-3

6.9

(1.25)

Dimensions
A

Dimensions, in. (mm)

0.75
2.50
316L-4-ATW-3

31.8

bar (psig)
351

0.51

(2.50)

(0.02)

64.0

0.76

(2.52)

(0.03)

69.6

19.0

0.76

(2.74)

(0.75)

(0.03)

70.1

1.0

(2.76)

(0.04)

77.2

1.0

(3.04)

(0.04)

F
7/16
7/16
11/16
15/16
1 1/4

(7/16)
(7/16)
(11/16)
(11/16)
(15/16)

Tx

Pressure
Rating

1.25

0.29

psig (bar)
5100

(31.8)

(7.4)

(351)

1.23

0.41

3300

(31.2)

(10.4)

(227)

1.38

0.55

3500

(35.1)

(14.0)

(241)

1.50

0.80

2400

(38.1)

(20.3)

(165)

1.89

1.06

2400

(48.0)

(26.9)

(165)

31.8

6.9

bar (psig)
454

(1.25)

(0.27)

(6589)

32.0

8.9

323

(1.26)

(0.35)

(4687)

34.8

10.9

254

(1.37)

(0.43)

(3686)

35.1

13.2

206

(1.38)

(0.52)

(2989)

38.6

19.3

206

(1.52)

(0.76)

(2989)

Weld Fittings

11

Automatic Tube Butt Weld Fittings

Reducing Tee

F flat

B
Tx

K
B

D1

Tube
OD

Wall
Tube
Wall
Thickness OD Thickness

3/8

0.035

1/4

Dimensions

Ordering
Number

(62.5)

0.035

316L-8-ATW-3-8-4

0.035

3/8
3/4

12

1.0

1/4

0.035

3/8
L

1/2

Tx1

Pressure
Rating

1.25

1.23

0.41

0.29

psig (bar)
3300

(7.4)

(227)

0.29

3700

(35.1) 1.38 0.55 (7.4)

0.04 (0.51)
11/16
(1.0) 0.03
1.37 (35.1) (14.0) 0.41

3300

(34.8)

(10.4)

(11/16)

34.5

35.1

13.2

6.9

(1.36) (1.38) (0.52) (0.27)

Dimensions
A

316L-8-ATW-3-8TB7-8A

2.43

(227)

2400
(165)

(14.0)

0.51 (0.02)

Ordering
Number

(254)

0.41

(1.0)

316L-6-ATW-3-6TB7-6A

0.049

Tx

1.38

(63.0)

0.035

(31.8) (31.2) (10.4)

Dimensions, in. (mm)

2.48
316L-4-ATW-3-4TB7-4A

7/16

0.04 (0.76)
1.50 1.50 0.80 (10.4)
15/16
(1.0) 0.04
(38.1) (38.1) (20.3) 0.55

3.00

(2.76) (0.75)

Tube
Wall
OD Thickness
F

0.02

(0.76)

Dimensions, mm (in.)
70.1 19.0
316L-12-MATW-3-12M6M

Manifold Tee
A

0.75

(76.2)

316L-12-ATW-3-12-8

1.0

0.03

316L-12-ATW-3-12-6

0.049

0.03

(19.0)

0.049
1/2

D1

(0.76) (0.51)

2.76
(70.1)

316L-8-ATW-3-8-6

0.035

0.02

0.049
3/8

Dimensions, in. (mm)

2.46
316L-6-ATW-3-6-4

0.035

1/4
1/2

Tx1

0.75

0.02
(0.51)

0.03

(61.7) (19.0) (0.76)

2.72

0.04

(69.1)

(1.0)

F
7/16
11/16
11/16

bar (psig)
200
(2902)

Tx

Pressure
Rating

1.23

1.25

0.29

psig (bar)
5100

(31.2) (31.8)

(7.4)

(351)

1.23

0.41

3300

1.20

(30.5) (31.2) (10.4)

(227)

1.38

0.55

3700

(34.0) (35.1) (14.0)

(254)

1.34

Tx

Reducing Tee

A
F flat

D
Tx

K
B

Tube
OD

Wall
Thickness

Tube
OD

3/8

0.035

1/4
1/4

1/2

Wall
Thickness

Ordering
Number

Dimensions, in. (mm)

2.46

316L-6-ATW-3-6A-4TB7
0.035

316L-8-ATW-3-8A-4TB7

0.049
3/8

Dimensions
A

316L-8-ATW-3-8A-6TB7

D
0.03

(62.5)

(0.76)

F
7/16

0.75
2.76
(70.1)

(19.0)

Tx

Pressure
Rating

1.23

1.23

0.41

psig (bar)
3300

(31.2)

(31.2)

(10.4)

0.04
(1.0)

11/16

(227)

3700

1.36
(34.5)

1.38

0.55

(254)

1.35

(35.1)

(14.0)

3300

(34.3)

(227)

12

Weld Fittings

Automatic Tube Butt Weld Fittings

Union Cross

Tube
OD

1/4
F flat

B
Tx

3/8
1/2

Wall
Thickness
0.035
0.035
0.049

6
1.0
8

Dimensions

Ordering
Number

Dimensions, in. (mm)

2.50
316L-4-ATW-4

0.02

(63.5)

316L-6-ATW-4
316L-8-ATW-4

7/16

(0.51)

2.46

0.75

0.03

(62.5)

(19.0)

(0.76)

2.70

0.04

(68.6)

(1.0)

Dimensions, mm (in.)
63.5
316L-6-MATW-4
(2.50)
19.0
(0.75)
64.0
316L-8-MATW-4

Tx

Pressure
Rating

1.25

0.29

psig (bar)
5100

7/16
5/8

(31.8)

(7.4)

(351)

1.23

0.41

3300

(31.2)

(10.4)

(227)

1.35

0.55

3700

(34.3)

(14.0)

(254)

6.9

bar (psig)
420

31.8

(0.27)

(6095)

(1.25)

8.9

310

(0.35)

(4499)

0.51
(0.02)

(7/16)

0.76

(2.52)

(0.03)

Automatic Tube Socket Weld Fittings

Thin wall reduces

weld heat input.

Ordering Information and Dimensions

Dimensions are for reference only and are subject to

change.
See Cleaning and Packaging, page 2, to order automatic

tube socket weld fittings cleaned in accordance with

Swagelok Special Cleaning and Packaging (SC-11),
MS0663.
Precise machining of socket
ensures proper tube fit.

Union

Tube
OD

1/4

Union Tee
A
B

Tx

Pressure
Rating

0.19 (4.8)

0.38 (9.7)

6800 (468)

0.50 (12.7) 4900 (337)

Dimensions, in. (mm)

Tx

Dimensions

Ordering
Number
316L-4-ASW-6

3/8

316L-6-ASW-6

1.00

0.31 (7.9)

0.28 (7.1)

1/2

316L-8-ASW-6

(25.4)

0.38 (9.7)

0.41 (10.4) 0.63 (16.0) 3800 (261)

3/4

316L-12-ASW-6

Tube
OD

Ordering
Number

L
F flat

1/4

Tx E
D
L

psig (bar)

0.28 (7.1)

3/8
1/2
3/4

316L-4-ASW-3
316L-6-ASW-3
316L-8-ASW-3
316L-12-ASW-3

0.44 (11.2) 0.63 (16.0) 0.88 (22.4) 2700 (186)

Dimensions
A

Dimensions, in. (mm)

0.28
2.46

0.19

(62.5)

(7.1)

(4.8)

2.68

0.31

0.28

(68.1)

0.75

(7.9)

(7.1)

2.68

(19.0)

0.38

0.41

(68.1)

(9.7)

(10.4)

2.94

0.44

0.63

(74.7)

(11.2)

(16.0)

F
7/16
11/16
11/16
15/16

Tx

Pressure
Rating

1.23

0.38

psig (bar)
6800

(31.2)

(9.7)

(468)

1.34

0.50

4900

(34.0)

(12.7)

(337)

1.34

0.63

3800

(34.0)

(16.0)

(261)

1.47

0.88

2700

(37.3)

(22.4)

(186)

Weld Fittings

13

Tube Socket Weld Fittings

Ordering Information and Dimensions
Dimensions are for reference only and are subject to

change.
See Cleaning and Packaging, page 2, to order automatic

tube socket weld fittings cleaned in accordance with

Swagelok Special Cleaning and Packaging (SC-11),
MS0663.

Union
D

Tube
Socket
Size

Precise machining of socket

ensures proper tube fit.

Dimensions

Ordering
Number

Tx

Dimensions, in. (mm)

Tx E
A

Male Connector
F flat

1/4

SS-4-TSW-6

0.75 (19.0)

0.28 (7.1)

3/8

SS-6-TSW-6

0.88 (22.4)

1/2

SS-8-TSW-6

1.06 (26.9)

Pressure
Rating
psig (bar)

0.19 (4.8)

0.48 (12.2) 10 700 (737)

0.31 (7.9)

0.28 (7.1)

0.60 (15.2)

8 100 (558)

0.38 (9.7)

0.41 (10.4) 0.73 (18.5)

6 600 (454)

3/4

SS-12-TSW-6

1.31 (33.3) 0.44 (11.2) 0.63 (16.0) 1.04 (26.4)

5 900 (406)

SS-16-TSW-6

1.44 (36.6) 0.62 (15.7) 0.88 (22.4) 1.36 (34.5)

5 600 (385)

Tube
Socket
Size

Male
NPT
Size

Ordering
Number

Dimensions
A

Tx

Dimensions, in. (mm)

1/4

Tx E
D

3/8

1/2

Female Connector
F flat

1/4

SS-4-TSW-1-4

1/4

SS-6-TSW-1-4

3/8

SS-6-TSW-1-6

1/2

SS-6-TSW-1-8

1/4

SS-8-TSW-1-4

3/8

SS-8-TSW-1-6

1/2

SS-8-TSW-1-8

1.15 (29.2)
1.25 (31.8)

0.28 (7.1)

psig (bar)
0.19 (4.8)
0.28 (7.1)

1.47 (37.3)
1.31 (33.3)

0.48 (12.2) 8000 (551)

11/16

8000 (551)
0.60 (15.2) 7800 (537)

7/8
0.28 (7.1)
0.38 (9.7)

1.53 (38.9)

0.38 (9.7)
0.41 (10.4)

Tube
Socket
Size

Female
NPT
Size

1/8

1/8

SS-2-TSW-7-2

0.83 (21.1)

1/8

SS-4-TSW-7-2

1.05 (26.7)

1/4

SS-4-TSW-7-4

1.18 (30.0)

1/4

SS-6-TSW-7-4

1.24 (31.5)

3/8

SS-8-TSW-7-6

1.36 (34.5)

1/2

SS-8-TSW-7-8

1.59 (40.4)

3/4

SS-12-TSW-7-12 1.73 (43.9) 0.44 (11.2) 0.63 (16.0)

Ordering
Number

9/16
5/8

0.31 (7.9)

3/4

7700 (530)
0.73 (18.5) 6600 (454)

7/8

Dimensions
A

Tx

Pressure
Rating

0.10 (2.5)

0.09 (2.3)

9/16

0.29 (7.4)

6500 (447)

0.28 (7.1)

0.19 (4.8)

0.31 (7.9)

0.28 (7.1)

Dimensions, in. (mm)

Tx E
D

1/4
A

3/8
1/2
3/4

Pressure
Rating

0.38 (9.7)

psig (bar)

0.41 (10.4)

9/16
3/4
3/4
7/8
1 1/16
1 5/16

0.48 (12.2)

6500 (447)
6600 (454)

0.60 (15.2) 6600 (454)

0.73 (18.5)

5300 (365)
4900 (337)

1.04 (26.4) 4600 (316)

14

Weld Fittings

Tube Socket Weld Fittings

90 Union Elbow
L

Tube
Socket
Size

F flat

Dimensions

Ordering
Number

Pressure
Rating

Tx

Dimensions, in. (mm)

Tx E
D

L
D

90 Male Elbow
L

SS-4-TSW-9

0.28 (7.1)

0.19 (4.8)

7/16

0.86 (21.8) 0.53 (13.5) 10 700 (737)

3/8

SS-6-TSW-9

0.31 (7.9)

0.28 (7.1)

1/2

1.04 (26.4) 0.64 (16.3)

8 100 (558)

1/2

SS-8-TSW-9

0.38 (9.7)

0.41 (10.4)

11/16

1.17 (29.7) 0.81 (20.6)

6 600 (454)

3/4

SS-12-TSW-9

0.44 (11.2) 0.63 (16.0)

1.56 (39.6) 1.12 (28.4)

5 900 (406)

SS-16-TSW-9

0.62 (15.7) 0.88 (22.4)

1 1/4

1.92 (48.8) 1.44 (36.6)

5 600 (385)

Tube
Socket
Size

F flat

Tx E

1/4
D

Male
NPT
Size
1/4
1/4

L1

3/8

3/8
1/2

90 Female Elbow
F flat

L
Tx E

1/2

1/2

Tube
Socket
Size

Female
NPT
Size

1/4
L1

1/4
1/4

Dimensions

Ordering
Number

1/2
1/2

Tube
Socket
Size

F flat

Tx E

1/8
D

1/4
3/8

1/2

(7.1)

3/4
1

1/2

(4.8)

1/2

SS-6-TSW-2-6

0.31

0.28

(7.9)

(7.1)

11/16

SS-6-TSW-2-8

13/16

SS-8-TSW-2-8

0.38

0.41

(9.7)

(10.4)

13/16

(7.1)

SS-6-TSW-8-4

SS-8-TSW-8-8

SS-6-TSW-3
SS-8-TSW-3
SS-12-TSW-3
SS-16-TSW-3

11/16

(4.8)

0.31

0.28

(7.9)

(7.1)

0.38

0.41

(9.7)

(10.4)

SS-6-TSW-8-8

SS-4-TSW-3

Tx

Pressure
Rating

0.79

1.05

0.48

psig (bar)
8000

(20.1)

(26.7)

(12.2)

(551)

1.04

1.05

0.64

8000

(26.4)

(26.7)

(16.3)

(551)

0.97

1.17

0.60

7800

(24.6)

(29.7)

(15.2)

(537)

1.02

1.45

0.60

7700

(25.9)

(36.8)

(15.2)

(530)

1.08

1.45

0.73

6600

(27.4)

(36.8)

(18.5)

(454)

L1

Tx

Pressure
Rating

0.90

1.17

0.48

psig (bar)
7400

(22.9)

(29.7)

(12.2)

0.99

1.17

(25.1)

(29.7)

0.60

(509)

1.13

1.56

(15.2)

5700

(28.7)

(39.6)

1.19

1.56

0.73

5700

(30.2)

(39.6)

(18.5)

(392)

Dimensions, in. (mm)

0.19
0.28
SS-4-TSW-8-4

SS-2-TSW-3

L1

Dimensions

Ordering
Number

Ordering
Number

SS-6-TSW-2-4

1/2

Dimensions, in. (mm)

0.19
0.28
SS-4-TSW-2-4

3/8

Union Tee

psig (bar)

1/4

11/16
1
1

Dimensions
A

Dimensions, in. (mm)

0.10
0.09
1.18
(30.0)

(2.5)

(2.3)

1.72

0.28

0.19

(43.7)

(7.1)

(4.8)

2.08

0.31

0.28

(52.8)

(7.9)

(7.1)

2.34

0.38

0.41

(59.4)

(9.7)

(10.4)

3.12

0.44

0.63

(79.2)

(11.2)

(16.0)

3.84

0.62

0.88

(97.5)

(15.7)

(22.4)

F
7/16
7/16
1/2
11/16
1
1 1/4

(509)

7400

(392)

Tx

Pressure
Rating

0.59

0.29

psig (bar)
12 600

(15.0)

(7.4)

(868)

0.86

0.53

10 700

(21.8)

(13.5)

(737)

1.04

0.64

8 100

(26.4)

(16.3)

(558)

1.17

0.81

6 600

(29.7)

(20.6)

(454)

1.56

1.04

5 900

(39.6)

(26.4)

(406)

1.92

1.45

5 600

(48.8)

(36.8)

(385)

Weld Fittings

Tube Socket Weld Fittings

Union Cross

Tube
Socket
Size

Dimensions

Ordering
Number

Tx E

3/8
D

1/2
3/4

Tube Butt Weld to

Tube Socket Weld

Tube
OD

SS-4-TSW-4
SS-6-TSW-4
SS-8-TSW-4
SS-12-TSW-4
SS-16-TSW-4

Wall
Thickness

(43.7)

(7.1)

(4.8)

2.08

0.31

0.28

(52.8)

(7.9)

(7.1)

2.34

0.38

0.41

(59.4)

(9.7)

(10.4)

3.12

0.44

0.63

(79.2)

(11.2)

(16.0)

3.84

0.62

0.88

(97.5)

(15.7)

(22.4)

Tube
Socket
Size

Tx

Pressure
Rating

0.86

0.53

psig (bar)
10 700

(21.8)

(13.5)

(737)

1.04

0.64

8 100

(26.4)

(16.3)

(558)

1.17

0.81

6 600

(29.7)

(20.6)

(454)

1.56

1.20

5 900

(39.6)

(30.5)

(406)

1.92

1.45

5 600

(48.8)

(36.8)

(385)

F
7/16
1/2
11/16
1
1 1/4

Dimensions

Ordering
Number

Tx

Pressure
Rating

0.56

0.10

0.09

0.29

psig (bar)
12 600

Dimensions, in. (mm)

1/4
E

Dimensions, in. (mm)

0.28
0.19
1.72

1/4

Tx

3/8

0.08
(2.0)

0.07
(1.8)

1/2

3/4
1

0.09
(2.2)

0.11
(2.8)

0.13
(3.2)

1/8

SS-4-MTW-A-2TSW

1/4

SS-6-MTW-A-4TSW

1/4

SS-8-MTW-A-4TSW

3/8

SS-8-MTW-A-6TSW

1/2

SS-12-MTW-A-8TSW

1/2

SS-16-MTW-A-8TSW

(14.2)

(2.5)

(2.3)

(7.4)

(868)

0.75

0.28

0.19

0.48

8 200

(7.1)

(4.8)

(12.2)

(564)

0.28

0.19

0.50

(19.0)

0.88

(7.1)

(4.8)

(12.7)

7 500

(22.4)

0.31

0.33

0.60

(516)

(7.9)

(8.3)

(15.2)

1.12

0.38

0.41

0.75

(28.4)

(9.7)

(10.4)

(19.0)

6 300
(434)

1.38

0.38

0.41

0.73

5 300

(35.1)

(9.7)

(10.4)

(18.5)

(365)

Pipe Socket Weld Fittings

Quality machining of all
surfaces ensures
consistent welding to pipe.

Ordering Information and Dimensions

Dimensions are for reference only and are subject to

change.
See Cleaning and Packaging, page 2, to order pipe

socket weld fittings cleaned in accordance with Swagelok

Special Cleaning and Packaging (SC-11), MS0663.

Union
D

P
Pipe
Size

Px P E

1/4
A

3/8
1/2
3/4
1

Ordering
Number

Heavy wall, plus strength

of material, ensures long
life in severe service
applications.

Dimensions
E

Px

Pressure
Rating

Dimensions, in. (mm)

0.39
1.06
SS-4-PSW-6

0.36

0.88

psig (bar)
8100

(26.9)

(9.9)

(9.1)

(22.4)

(558)

1.12

0.39

0.49

1.03

7100

(28.4)

(9.9)

(12.4)

(26.2)

(489)

1.12

0.39

0.62

1.25

6800

(28.4)

(9.9)

(15.7)

(31.8)

(468)

1.75

0.51

0.82

1.47

5800

(44.4)

(13.0)

(20.8)

(37.3)

(399)

1.75

0.51

1.05

1.86

6100

(44.4)

(13.0)

(26.7)

(47.2)

(420)

SS-6-PSW-6
SS-8-PSW-6
SS-12-PSW-6
SS-16-PSW-6

Socket depth equals or

exceeds requirements of
ASME B16.11 and ensures
proper pipe support.

15

Pipe Butt Weld Fittings

Ordering Information and Dimensions

37 1/2 chamfer ensures

proper weld
(not included on 1/4 in. size).

Dimensions are for reference only and are subject to

change.
See Cleaning and Packaging, page 2, to order pipe butt

Male weld end can be

butt or socket welded.

weld fittings cleaned in accordance with Swagelok Special

Cleaning and Packaging (SC-11), MS0663.

Tube Socket Weld

to Pipe Butt Weld

Tube
OD

Pipe
Size
(Sch 80)

37 1/2

Tx

Dimensions

Ordering
Number

Tx

Dimensions, in. (mm)

1/4

3/8

1/2

3/4

1/4

SS-4-MPW-A-4TSW

0.88 (22.4)

1/2

SS-8-MPW-A-4TSW

1.12 (28.4)

3/8

SS-6-MPW-A-6TSW

1.03 (26.2)

1/2

SS-8-MPW-A-6TSW

1.12 (28.4)

3/4

SS-12-MPW-A-6TSW

1.50 (38.1)

SS-16-MPW-A-6TSW

1.38 (35.1)

3/8

SS-6-MPW-A-8TSW

1/2
3/4

Pressure
Rating
psig (bar)

0.28 (7.1)

0.19 (4.8)

0.48 (12.2)

10 300 (709)
7 800 (537)
8 100 (558)

0.31 (7.9)

0.28 (7.1)

0.60 (15.2)

1.00 (25.4)

0.38 (9.7)

0.42 (10.7)

SS-8-MPW-A-8TSW

1.19 (30.2)

0.38 (9.7)

0.41 (10.4)

SS-12-MPW-A-8TSW

1.50 (38.1)

0.38 (9.7)

0.41 (10.3)

SS-16-MPW-A-8TSW

1.56 (39.6) 0.44 (11.2)

0.38 (9.7)

3/4

SS-12-MPW-A-12TSW

1.50 (38.1) 0.44 (11.2) 0.62 (15.7) 1.05 (26.7)

7 800 (537)
6 600 (454)
6 000 (413)
6 600 (454)

0.73 (18.5)

6 600 (454)
6 600 (454)
6 000 (413)
5 900 (406)

Swagelok Orbital
Welding System
See the Swagelok Welding
System M200 Power Supply
catalog, MS02342, for more
information.

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.

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, Micro-FitTM Swagelok Company

20092010 Swagelok Company
Printed in U.S.A., AGS
December 2010, R8
MS-01-149