Stainless seamless steel pipe are made of steel ingots or solid tube billets through perforation to make capillaries, and then hot rolled, cold rolled, or cold drew which with excellent corrosion and high temperature resistance. This article will introduce stainless steel seamless tube tolerances in detail. Read on to learn more.
Stainless Steel Seamless Pipe OD 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) |
Stainless Steel Seamless Pipe Nominal WT Tolerances
Nominal Wall Tolerance Plus 12.5%, Minus 12.5%
|
NPS Designator |
Outside Diameter in. |
Schedule 10S in. |
Schedule 40S in. |
Schedule 80S in. |
Schedule 160 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 |
.188 |
.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 |
|
.636 |
|
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 |
.719 |
.864 |
|
8 |
8.625 |
0.148 |
0.322 |
0.500 |
.906 |
.875 |
|
10 |
10.750 |
0.165 |
0.365 |
0.500 |
1.125 |
|
|
12 |
12.750 |
0.180 |
0.375 |
0.500 |
1.312 |
|
|
14 |
14.000 |
0.188 |
0.375 |
0.500 |
1.406 |
|
|
16 |
16.000 |
0.188 |
0.375 |
0.500 |
1.594 |
|
Minimum Wall Thickness on Inspection:
The following equation on which this table is based can be used to calculate the minimum wall thickness based on the nominal wall thickness:
tn * 0.875 = tm
Where:
tn = nominal wall thickness, in. [mm], and tm= minimum wall thicknesses, in. [mm]
Wall thickness is given in inch-pounds, rounded to three decimal places in accordance with the rounding method of Practice E29. Wall thicknesses expressed in SI units are rounded to one decimal place in accordance with the rounding method of Practice E29.
This table is a master table covering the wall thicknesses available when purchasing different classes of pipe, but it does not mean that all wall thicknesses listed here must be obtained for the applicable product specification.
|
Nominal Thickness |
Minimum Thickness on Inspection |
Nominal Thickness |
Minimum Thickness on Inspection |
Nominal Thickness |
Minimum Thickness on Inspection |
||||||
|
in. |
mm |
in |
mm |
in |
mm |
in |
mm |
in |
mm |
in |
mm |
|
0.068 |
1.7 |
0.060 |
1.5 |
0.294 |
7.5 |
0.257 |
6.5 |
0.750 |
19.0 |
0.658 |
16.6 |
|
0.068 |
2.2 |
0.077 |
2.0 |
0.300 |
7.6 |
0.262 |
6.7 |
0.812 |
20.6 |
0.710 |
18.0 |
|
0.091 |
2.3 |
0.080 |
2.0 |
0.307 |
7.8 |
0.269 |
6.8 |
0.843 |
21.4 |
0.736 |
18.7 |
|
0.095 |
2.4 |
0.083 |
2.1 |
0.308 |
7.8 |
0.270 |
6.9 |
0.854 |
21.7 |
0.756 |
19.2 |
|
0.113 |
2.9 |
0.099 |
2.5 |
0.312 |
7.9 |
0.273 |
6.9 |
0.875 |
22.2 |
0.766 |
19.5 |
|
0.119 |
3.0 |
0.104 |
2.6 |
0.318 |
8.1 |
0.278 |
7.1 |
0.906 |
23.0 |
0.783 |
20.1 |
|
0.125 |
3.2 |
0.109 |
2.8 |
0.322 |
8.2 |
0.282 |
7.2 |
0.937 |
23.8 |
0.820 |
20.8 |
|
0.126 |
3.2 |
0.110 |
2.8 |
0.330 |
8.4 |
0.289 |
7.3 |
0.968 |
24.6 |
0.847 |
21.5 |
|
0.133 |
3.4 |
0.116 |
2.9 |
0.337 |
8.6 |
0.295 |
7.5 |
1.000 |
25.4 |
0.875 |
22.2 |
|
0.140 |
3.6 |
0.122 |
3.1 |
0.343 |
8.7 |
0.300 |
7.6 |
1.031 |
26.2 |
0.902 |
22.9 |
|
0.145 |
3.7 |
0.127 |
3.2 |
0.344 |
8.7 |
0.301 |
7.6 |
1.062 |
27.0 |
0.929 |
23.6 |
|
0.147 |
3.7 |
0.129 |
3.3 |
0.358 |
9.1 |
0.313 |
8.0 |
1.083 |
27.8 |
0.956 |
24.3 |
|
0.154 |
3.9 |
0.135 |
3.4 |
0.365 |
9.3 |
0.319 |
8.1 |
1.125 |
28.6 |
0.984 |
25.0 |
|
0.156 |
4.0 |
0.136 |
3.5 |
0.375 |
9.5 |
0.328 |
8.3 |
1.156 |
29.4 |
1.012 |
25.7 |
|
0.179 |
4.5 |
0.157 |
4.0 |
0.382 |
9.7 |
0.334 |
8.5 |
1.218 |
30.9 |
1.066 |
27.1 |
|
0.187 |
43.7 |
0.164 |
4.2 |
0.400 |
10.2 |
0.350 |
8.9 |
1.250 |
31.8 |
1.094 |
27.8 |
|
0.188 |
4.8 |
0.164 |
4.2 |
0.406 |
10.3 |
0.355 |
9.0 |
1.281 |
32.5 |
1.121 |
28.5 |
|
0.191 |
4.9 |
0.167 |
4.2 |
0.432 |
10.4 |
0.378 |
9.6 |
1.312 |
33.3 |
1.148 |
29.2 |
|
0.200 |
5.1 |
0.175 |
4.4 |
0.436 |
11.1 |
0.382 |
9.7 |
1.343 |
34.1 |
1.175 |
29.8 |
|
0.203 |
5.2 |
0.178 |
4.5 |
0.437 |
11.1 |
0.382 |
9.7 |
1.375 |
34.9 |
1.203 |
30.6 |
|
0.216 |
5.5 |
0.189 |
4.8 |
0.438 |
11.1 |
0.383 |
9.7 |
1.406 |
35.7 |
1.230 |
31.2 |
|
0.218 |
5.5 |
0.191 |
4.9 |
0.500 |
12.7 |
0.438 |
11.1 |
1.436 |
36.5 |
1.258 |
32.0 |
|
0.219 |
5.6 |
0.192 |
4.9 |
0.531 |
13.5 |
0.465 |
11.8 |
1.500 |
36.1 |
1.312 |
33.3 |
|
0.226 |
5.7 |
0.196 |
5.0 |
0.552 |
14.0 |
0.483 |
12.3 |
1.531 |
38.9 |
1.340 |
34.0 |
|
0.237 |
6.0 |
0.207 |
5.2 |
0.562 |
14.3 |
0.492 |
12.5 |
1.562 |
39.7 |
1.367 |
34.7 |
|
0.250 |
6.4 |
0.219 |
5.6 |
0.593 |
15.1 |
0.519 |
13.2 |
1.593 |
40.5 |
1.394 |
35.4 |
|
0.258 |
6.6 |
0.226 |
5.7 |
0.600 |
15.2 |
0.525 |
13.3 |
1.750 |
44.5 |
1.531 |
38.9 |
|
0.276 |
7.0 |
0.242 |
6.1 |
0.625 |
15.9 |
0.547 |
13.9 |
1.781 |
45.2 |
1.558 |
39.6 |
|
0.277 |
7.0 |
0.242 |
6.1 |
0.656 |
16.6 |
0.573 |
14.6 |
1.812 |
46.0 |
1.586 |
49.3 |
|
0.279 |
7.1 |
0.244 |
6.2 |
0.674 |
17.1 |
0.590 |
15.0 |
1.968 |
50.0 |
1.772 |
43.7 |
|
0.280 |
7.1 |
0.245 |
6.2 |
0.687 |
17.4 |
0.601 |
15.3 |
2.062 |
52.4 |
1.804 |
45.8 |
|
0.281 |
7.1 |
0.246 |
6.2 |
0.719 |
18.3 |
0.629 |
16.0 |
2.343 |
59.5 |
2.050 |
52.1 |
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