The steel pipe data chart below can be used to find pipe sizes, diameters, wall thickness, working pressures and more The chart is based on ASME/ANSI B 36.10 Welded and Seamless Wrought Steel Pipe and ASME/ANSI B36.19 Stainless Steel Pipe.
Regardless of schedule number, pipes of a particular size all have the same outside diameter (not withstanding manufacturing tolerances). As the schedule number increases, the wall thickness increases, and the actual bore is reduced. For example:
| Pipe Size (inches) |
Outside Diameter (inches) |
Identification | Wall Thickness - t - (inches) |
Inside Diameter - d - (inches) |
||
| Steel | Stainless Steel Schedule No. | |||||
| Iron Pipe Size | Schedule No. | |||||
| 1/8 | 0.405 | . STD XS |
. 40 80 |
10S 40S 80S |
.049 .068 .095 |
.307 .269 .215 |
| � | 0.540 | . STD XS |
. 40 80 |
10S 40S 80S |
.065 .088 .119 |
.410 .364 .302 |
| 3/8 | 0.675 | . STD XS |
. 40 80 |
10S 40S 80S |
.065 .091 .126 |
.545 .493 .423 |
| � | 0.840 | . . STD XS . XXS |
. . 40 80 160 . |
5S 10S 40S 80S . . |
.065 .083 .109 .147 .187 .294 |
.710 .674 .622 .546 .466 .252 |
| � | 1.050 |
. . STD XS . XXS |
. . 40 80 160 . |
5S 10S 40S 80S . . |
.065 .083 .113 .154 .219 .308 |
.920 .884 .824 .742 .612 .434 |
| 1 | 1.315 | . . STD XS . XXS |
. . 40 80 160 . |
5S 10S 40S 80S . . |
.065 .109 .133 .179 .250 .358 |
1.185 1.097 1.049 .957 .815 .599 |
| 1 � | 1.660 | . . STD XS . XXS |
. . 40 80 160 . |
5S 10S 40S 80S . . |
.065 .109 .140 .191 .250 .382 |
1.530 1.442 1.380 1.278 1.160 .896 |
| 1 � | 1.900 | . . STD XS . XXS |
. . 40 80 160 . |
5S 10S 40S 80S . . |
.065 .109 .145 .200 .281 .400 |
1.770 1.682 1.610 1.500 1.338 1.100 |
| 2 | 2.375 | . . STD XS . XXS |
. . 40 80 160 . |
5S 10S 40S 80S . . |
.065 .109 .154 .218 .344 .436 |
2.245 2.157 2.067 1.939 1.687 1.503 |
| 2 � | 2.875 | . . STD XS . XXS |
. . 40 80 160 . |
5S 10S 40S 80S . . |
.083 .120 .203 .276 .375 .552 |
2.709 2.635 2.469 2.323 2.125 1.771 |
| 3 | 3.500 | . . STD XS . XXS |
. . 40 80 160 . |
5S 10S 40S 80S . . |
.083 .120 .216 .300 .438 .600 |
3.334 3.260 3.068 2.900 2.624 2.300 |
| 3 � | 4.000 | . . STD XS |
. . 40 80 |
5S 10S 40S 80S |
.083 .120 .226 .318 |
3.834 3.760 3.548 3.364 |
| 4 | 4.500 | . . STD XS . . XXS |
. . 40 80 120 160 . |
5S 10S 40S 80S . . . |
.083 .120 .237 .337 .438 .531 .674 |
4.334 4.260 4.026 3.826 3.624 3.438 3.152 |
| 5 | 5.563 | . . STD XS . . XXS |
. . 40 80 120 160 . |
5S 10S 40S 80S . . . |
.109 .134 .258 .375 .500 .625 .750 |
5.345 5.295 5.047 4.813 4.563 4.313 4.063 |
| 6 | 6.625 | . . STD XS . . XXS |
. . 40 80 120 160 . |
5S 10S 40S 80S . . . |
.109 .134 .280 .432 .562 .718 .864 |
6.407 6.357 6.065 5.761 5.501 5.187 4.897 |
| 8 | 8.625 | . . . . STD . XS . . . XXS . |
. . 20 30 40 60 80 100 120 140 . 160 |
5S 10S . . 40S . 80S . . . . . |
.109 .148 .250 .277 .322 .406 .500 .594 .719 .812 .875 .906 |
8.407 8.329 8.125 8.071 7.981 7.813 7.625 7.437 7.187 7.001 6.875 6.813 |
| 10 | 10.750 | . . . . STD XS . . . . . |
. . 20 30 40 60 80 100 120 140 160 |
5S 10S . . 40S 80S . . . . . |
.134 .165 .250 .307 .365 .500 .594 .719 .844 1.000 1.125 |
10.482 10.420 10.250 10.136 10.020 9.750 9.562 9.312 9.062 8.750 8.500 |
| 12 | 12.75 | . . . . STD . XS . . . . . . |
. . 20 30 . 40 . 60 80 100 120 140 160 |
5S 10S . . 40S . 80S . . . . . . |
.156 .180 .250 .330 .375 .406 .500 .562 .688 .844 1.000 1.125 1.312 |
12.438 12.390 12.250 12.090 12.000 11.938 11.750 11.626 11.374 11.062 10.750 10.500 10.126 |
| 14 | 14.00 | . . . . STD . XS . . . . . .. |
. . 10 20 30 40 . 60 80 100 120 140 160 |
5S 10S . . . . . . . . . . . |
156 .188 .250 .312 .375 .438 .500 .594 .750 .938 1.094 1.250 1.406 |
13.688 13.624 13.500 13.376 13.250 13.124 13.000 12.812 12.500 12.124 11.812 11.500 11.188 |
| 16 | 16.00 | . . . . STD XS . . . . . . |
. . 10 20 30 40 60 80 100 120 140 160 |
5S 10S . . . . . . . . . . |
.165 .188 .250 .312 .375 .500 .656 .844 1.031 1.219 1.438 1.594 |
15.670 15.624 15.500 15.376 15.250 15.000 14.688 14.312 13.938 13.562 13.124 12.812 |
| 18 | 18.00 | . . . . STD . XS . . . . . . . |
. . 10 20 . 30 . 40 60 80 100 120 140 160 |
5S 10S . . . . . . . . . . . . |
.165 .188 .250 .312 .375 .438 .500 .562 .750 .938 1.156 1.375 1.562 1.781 |
17.670 17.624 17.500 17.376 17.250 17.124 17.000 16.876 16.500 16.124 15.688 15.250 14.876 14.438 |
| 20 | 20.00 | . . . STD XS . . . . . . . |
. . 10 20 30 40 60 80 100 120 140 160 |
5S 10S . . . . . . . . . . |
.188 .218 .250 .375 .500 .594 .812 1.031 1.281 1.500 1.750 1.969 |
19.624 19.564 19.500 19.250 19.000 18.812 18.376 17.938 17.438 17.000 16.500 16.062 |
| 22 | 22.00 | . . . STD XS . . . . . . |
. . 10 20 30 60 80 100 120 140 160 |
5S 10S . . . . . . . . . |
.188 .218 .250 .375 .500 .875 1.125 1.375 1.625 1.875 2.125 |
21.624 21.564 21.500 21.250 21.000 20.250 19.75 19.25 18.75 18.25 17.75 |
| 24 | 24.00 | . . STD XS . . . . . . . . |
. 10 20 . 30 40 60 80 100 120 140 160 |
5S 10S . . . . . . . . . . |
.218 .250 .375 .500 .562 .688 .969 1.219 1.531 1.812 2.062 2.344 |
23.564 23.500 23.250 23.000 22.876 22.624 22.062 21.562 20.938 20.376 19.876 19.312 |
| 26 | 26.00 | . STD XS |
10 . 20 |
. . . |
.312 .375 .500 |
25.376 25.250 25.000 |
| 28 | 28.00 | . STD XS . |
10 . 20 30 |
. . . . |
.312 .375 .500 .625 |
27.376 27.250 27.000 26.750 |
| 30 | 30.00 | . . STD XS . |
. 10 . 20 30 |
5S 10S . . . |
.250 .312 .375 .500 .625 |
29.500 29.376 29.250 29.000 28.750 |
| 32 | 32.00 | . STD XS . . |
10 . 20 30 40 |
. . . . . |
.312 .375 .500 .625 .688 |
31.376 31.250 31.000 30.750 30.624 |
| 34 | 34.00 | . STD XS . . |
10 . 20 30 40 |
. . . . . |
.344 .375 .500 .625 .688 |
33.312 33.250 33.000 32.750 32.624 |
| 36 | 36.00 | . STD XS . . |
10 . 20 30 40 |
. . . . . |
.312 .375 .500 .625 .750 |
35.376 35.250 35.000 34.750 34.500 |
| 42 | 42.00 | STD XS . . |
. 20 30 40 |
. . . . |
.375 .500 .625 .750 |
41.250 41.000 40.720 40.500 |
To distinguish different weights of pipe, three long standing traditional designations are used: standard wall (Std.), extra strong wall (XS), and double extra strong wall (XXS). These last two designations are sometimes referred to as extra heavy wall (XH), and double extra heavy wall (XXH).