Metric Swagelok Tube Fittings
Metric tube fittings have a stepped shoulder on the body hex. Shaped fittings, such as elbows, crosses, and tees, are stamped MM for metric tubing and have no step on the forging.
Swagelok metric
tube end
Gaugeable Tube Fittings and Adapter Fittings 9 Swagelok
Swagelok fractional tube stub
metric tube ends
Stepped identification shoulders
Pressure Ratings
Swagelok Tube Fitting Pressure Ratings Swagelok tube fitting ends are rated to the working pressure of tubing as listed in Swagelok Tubing Data, MS-01-107. Careful selection of high-quality tubing is important when installing safe, leak-tight systems.
Pipe End (NPT and ISO 7) Pressure Ratings Basis
Pressure ratings for fittings with both tube fitting and pipe thread ends are determined by the end connection with the lower pressure rating. The table lists pressure ratings for male and female tapered pipe thread ends. For female and male pipe threads to have the same pressure rating in the same nominal pipe size, the female thread would require a heavier wall, resulting in a fitting too large and bulky to be practical.
Allowable Stress
Stress values are based on ASME Code for Pressure Piping B31.3, Process Piping, at ambient temperature. Material
Allowable Stress psi
316 SS Brass Steel
20 000 10 000 20 000
Pressure Ratings
Ratings are based on ASME Code for Pressure Piping B31.3, Process Piping, at ambient temperature.
NPT/ ISO Pipe Size in.
316 SS and Carbon Steel Male
Female psig bar psig bar Brass Male psig bar Female psig bar
1/16 11 000 760 6700 460 5500 380 3300 230 1/8 10 000 690 6500 440 5000 340 3200 220 1/4 8 000 550 6600 450 4000 270 3300 220 3/8 7 800 540 5300 360 3900 270 2600 180 1/2 7 700 530 4900 330 3800 260 2400 160 3/4 7 300 500 4600 320 3600 250 2300 160 1
bar
1378 689
1378 SAE/MS Fittings Pressure Ratings Basis
Pressure ratings are based on SAE J1926/3 at ambient temperature.
316 SS and Carbon Steel SAE/MS
Thread Size Designator 5/16-24 7/16-20 1/2-20
9/16-18 3/4-16 7/8-14
1 1/16-12 1 3/16-12 1 5/16-12 1 5/8-12 1 7/8-12 2 1/2-12
2ST 4ST 5ST 6ST 8ST
10ST 12ST 14ST 16ST 20ST 24ST 32ST
Nonpositionable psig
bar 4568 315 3626 3626 2900
2320 1813
250 200
160 125
2900 2320
1813 1450
250 200 160
125 100
Some fittings with AN, O-seal, and SAE/MS ends may have lower ratings. For more information, contact your authorized Swagelok representative.
O-Seal Pressure Ratings
Stainless steel and carbon steel O-seal fittings up to 1 in. and 25 mm are rated to 3000 psig (206 bar).
Positionable, ISO/BSP Parallel Thread (PR) Pressure Ratings
Pressure ratings are at ambient temperature. 5 300 370 4400 300 2600 180 2200 150
1 1/4 6 000 410 5000 350 3000 200 2500 170 1 1/2 5 000 340 4600 310 2500 170 2300 150 2
■ To determine pressure ratings in accordance with ASME B31.1, Power Piping:
■ carbon steel material—multiply by 0.85. Stainless steel and brass material ratings remain the same. ■ To determine MPa, multiply bar by 0.10.
3 900 270 3900 270 1900 130 1900 130
ISO/BSP Male Pipe Size in.
1/8
1/4 3/8 1/2
3/4 1
4568 2320 315 160
316 SS and Carbon Steel
psig bar
Positionable psig
4568 bar 315
No shoulder
Stepped identification shoulders
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