Stainless Steel Seamless Pipe Specifications

T304/304H ASTM A312, ASME SA312
T304/304L ASTM A312, ASME SA312
T316/316L ASTM A312, ASME SA312

Lengths: 17' - 24' Random Lengths

Tolerances
NPS Designator Permissible Variations in Outside Diameter

Over
in.
Under
in.
1/8 to 1-1/2, incl 1/64 (0.015) 1/32 (0.031)
Over 1-1/2 to 4, incl 1/32 (0.031) 1/32 (0.031)
Over 4 to 8, incl 1/16 (0.062) 1/32 (0.031)
Over 8 to 18, incl 3/23 (0.093) 1/32 (0.031)

Nominal wall thickness
NPS
Designator
Outside
Diameter in.
Schedule 10S
in.
Schedule 40S
in.
Schedule 80S
in.
Schedule 160S
in.
Schedule XX
in.
1/4 0.540 0.065 0.088 0.119    
3/8 0.675 0.065 0.091 0.126    
1/2 0.840 0.083 0.109 0.147 .187 .294
3/4 1.050 0.083 0.113 0.154 .218 .308
1.0 1.315 0.109 0.133 0.179 .250 .358
1 1/4 1.660 0.109 0.140 0.191 .250 .382
1 1/2 1.900 0.109 0.145 0.200 .281 .400
2 2.375 0.109 0.154 0.218 .343 .436
2 1/2 2.875 0.120 0.203 0.276 .375 .552
3 3.500 0.120 0.216 0.300 .438 .600
3 1/2 4.000 0.120 0.226 0.318    
4 4.500 0.120 0.237 0.337 .534 .674
5 5.563 0.134 0.258 0.375 .625 .750
6 6.625 0.134 0.280 0.432 .718 .864
8 8.625 0.148 0.322 0.500 .906 .875
10 10.750 0.165 0.365 0.500B    
12 12.750 0.180 0.375B 0.500B    
14 14.000 0.188B        
16 16.000 0.188B        

Nominal Wall Tolerance Plus 12.5%, Minus 12.5%
B - These do not conform to the American National Standard for welded and seamless wrought steel pipe (ANSI B 36.10 - 1979)

 

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