ASME B36.19M reference
Stainless Steel Pipe Schedule Chart
Compare common stainless pipe schedules by NPS, outside diameter, nominal wall, calculated inside diameter and theoretical mass. Use the applicable purchased standard and product specification for ordering.
| NPS | OD (mm) | Wall (mm) | Calculated ID (mm) | Theoretical kg/m |
|---|---|---|---|---|
| 1/2 | 21.3 | 2.11 | 17.08 | 1.01 |
| 3/4 | 26.7 | 2.11 | 22.48 | 1.29 |
| 1 | 33.4 | 2.77 | 27.86 | 2.11 |
| 1 1/4 | 42.2 | 2.77 | 36.66 | 2.72 |
| 1 1/2 | 48.3 | 2.77 | 42.76 | 3.14 |
| 2 | 60.3 | 2.77 | 54.76 | 3.97 |
| 2 1/2 | 73.0 | 3.05 | 66.90 | 5.32 |
| 3 | 88.9 | 3.05 | 82.80 | 6.52 |
| 4 | 114.3 | 3.05 | 108.20 | 8.45 |
| 5 | 141.3 | 3.40 | 134.50 | 11.68 |
| 6 | 168.3 | 3.40 | 161.50 | 13.97 |
| 8 | 219.1 | 3.76 | 211.58 | 20.17 |
| 10 | 273.0 | 4.19 | 264.62 | 28.06 |
| 12 | 323.8 | 4.57 | 314.66 | 36.34 |
Outside diameter and nominal wall values are a working reference to ASME B36.19M common sizes. Inside diameter is calculated as OD minus twice the nominal wall. Theoretical mass uses 7.93 g/cm³ generic stainless density and does not replace certified dimensions, tolerances or weighbridge results.
Schedule is not pressure rating
Allowable pressure also depends on material, temperature, code, joint, corrosion allowance and design factors.
NPS is not outside diameter
Use the OD column for mating, fabrication and weight calculations; NPS is the nominal size designation.
Order the product standard too
Pipe dimensions and material requirements are separate. For austenitic process pipe, review the ASTM A312 guide and the 316L seamless pipe buying page.
Technical content updated: 2026-07-29
Organizational author: Tsingshan (Shandong) Iron & Steel Co., Ltd..Review method, status and limitations.
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