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The table below shows the outside (O.D) and inside (I.D) diameters, as well as the wall thicknesses for various pipe sizes. The dimensions vary according to the schedule thickness (40, 10, or 5). The most common is 40; the rarest is 5.
For example, a 1-1/4 inch schedule 40 pipe size has a 1.660 inch O.D., a 1.380 inch I.D., and a 0.140 inch wall thickness. The wall thickness is the difference between the O.D. and I.D. divided by two {(1.66-1.38) / 2 = 0.140}.
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| O.D.,
I.D., & Wall Thickness Dimensions For Given Pipe Sizes |
| Pipe
Size |
Schedule
40 Thickness |
Schedule
10 Thickness |
Schedule
5 Thickness |
| O.D. |
I.D.
|
Wall
Thickness |
O.D. |
I.D.
|
Wall
Thickness |
O.D. |
I.D.
|
Wall
Thickness |
| 3/4 |
1.050 |
0.824 |
0.113 |
1.050 |
0.884 |
0.083 |
1.050 |
0.920 |
0.065 |
| 1 |
1.315 |
1.049 |
0.133 |
1.315 |
1.097 |
0.109 |
1.315 |
1.185 |
0.065 |
| 1-1/4 |
1.660 |
1.380 |
0.140 |
1.660 |
1.442 |
0.109 |
1.660 |
1.530 |
0.065 |
| 1-1/2 |
1.900 |
1.610 |
0.145 |
1.900 |
1.682 |
0.109 |
1.900 |
1.770 |
0.065 |
| 2 |
2.375 |
2.067 |
0.154 |
2.375 |
2.157 |
0.109 |
2.375 |
2.245 |
0.065 |
| 2-1/2 |
2.875 |
2.469 |
0.203 |
2.875 |
2.635 |
0.120 |
2.875 |
2.709 |
0.083 |
| 3 |
3.500 |
3.068 |
0.216 |
3.500 |
3.260 |
0.120 |
3.500 |
3.334 |
0.083 |
| 3-1/2 |
4.000 |
3.548 |
0.226 |
4.000 |
3.760 |
0.120 |
4.000 |
3.834 |
0.083 |
| 4 |
4.500 |
4.026 |
0.237 |
4.500 |
4.260 |
0.120 |
4.500 |
4.334 |
0.083 |
| 6 |
6.625 |
6.065 |
0.280 |
6.625 |
6.357 |
0.134 |
6.625 |
6.407 |
0.109 |
| 8 |
8.625 |
7.981 |
0.322 |
8.625 |
8.329 |
0.148 |
8.625 |
8.407 |
0.109 |
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