| NPS | OD | Sch 5S | Sch 10S | Sch 40S | Sch 80S | Sch 40 | Sch 80 | Sch 160 | XXS |
|---|---|---|---|---|---|---|---|---|---|
| 1/2" | 21.30 | 1.65 | 2.11 | 2.77 | 3.73 | 2.77 | 3.73 | 4.78 | 7.47 |
| 3/4" | 26.70 | 1.65 | 2.11 | 2.87 | 3.91 | 2.87 | 3.91 | 5.56 | 7.82 |
| 1" | 33.40 | 1.65 | 2.77 | 3.38 | 4.55 | 3.38 | 4.55 | 6.35 | 9.09 |
| 1-1/4" | 42.20 | 1.65 | 2.77 | 3.56 | 4.85 | 3.56 | 4.85 | 6.35 | 9.70 |
| 1-1/2" | 48.30 | 1.65 | 2.77 | 3.68 | 5.08 | 3.68 | 5.08 | 7.14 | 10.15 |
| 2" | 60.30 | 1.65 | 2.77 | 3.91 | 5.54 | 3.91 | 5.54 | 8.74 | 11.07 |
| 2-1/2" | 73.00 | 2.11 | 3.05 | 5.16 | 7.01 | 5.16 | 7.01 | 9.53 | 14.02 |
| 3" | 88.90 | 2.11 | 3.05 | 5.49 | 7.62 | 5.49 | 7.62 | 11.13 | 15.24 |
| 3-1/2" | 101.60 | 2.11 | 3.05 | 5.74 | 8.08 | 5.74 | 8.08 | — | — |
| 4" | 114.30 | 2.11 | 3.05 | 6.02 | 8.56 | 6.02 | 8.56 | 13.49 | 17.12 |
| 5" | 141.30 | 2.77 | 3.40 | 6.55 | 9.53 | 6.55 | 9.53 | 15.88 | 19.05 |
| 6" | 168.30 | 2.77 | 3.40 | 7.11 | 10.97 | 7.11 | 10.97 | 18.26 | 21.95 |
| 8" | 219.10 | 2.77 | 3.76 | 8.18 | 12.70 | 8.18 | 12.70 | 23.01 | 22.23 |
| 10" | 273.00 | 3.40 | 4.19 | 9.27 | 12.70 | 9.27 | 15.09 | 28.58 | 25.40 |
| 12" | 323.80 | 3.96 | 4.57 | 9.53 | 12.70 | 10.31 | 17.48 | 33.32 | 25.40 |
| 14" | 355.60 | 3.96 | 4.78 | 9.53 | 12.70 | 11.13 | 19.05 | 35.71 | — |
| 16" | 406.40 | 4.19 | 4.78 | 9.53 | 12.70 | 12.70 | 21.44 | 40.49 | — |
| 18" | 457.20 | 4.19 | 4.78 | 9.53 | 12.70 | 14.27 | 23.83 | 45.24 | — |
| 20" | 508.00 | 4.78 | 5.54 | 9.53 | 12.70 | 15.09 | 26.19 | 50.01 | — |
| 22" | 558.80 | 4.78 | 5.54 | 9.53 | 12.70 | — | — | 53.98 | — |
| 24" | 609.60 | 5.54 | 6.35 | 9.53 | 12.70 | 17.48 | 30.96 | 59.54 | — |
Indicative values for guidance only. Always confirm against the governing standard and the Material Test Certificate before ordering or designing.
Reading the chart
Outside diameter is fixed by NPS. A 4" pipe is 114.3 mm OD in every schedule. The schedule sets the wall thickness, which grows inwards and reduces the bore. That is what lets fittings, flanges and supports built for a given NPS fit any schedule of that size.
S schedules are not the same as plain schedules above the mid sizes. 40S matches Sch 40 up to NPS 10 and then holds at 9.53 mm; 80S matches Sch 80 up to NPS 8 and then holds at 12.70 mm. If a drawing says only “Sch 40” on a large stainless line, confirm which standard governs before ordering.
STD, XS and XXS are the older designations. STD matches Sch 40 up to NPS 10; XS matches Sch 80 up to NPS 8; above those they hold constant at 9.53 mm and 12.70 mm respectively.
A dash means that combination is not a standard listed size. We have left it blank rather than interpolating a number.
Need the weight? Put the OD and wall into the weight calculator.
