ANSI Pipe Schedule SI-Units (metric) ASTM B337
| Nominal Pipe Size (NPS) | Outside Diameter (mm) | Schedule 5 (mm) | Schedule 10 (mm) | Schedule 20 (mm) | Schedule 30 (mm) | Standard Thickness (mm) | Schedule 40 (mm) | Extra Strong (mm) | Schedule 60 (mm) | Schedule 80 (mm) | Schedule 100 (mm) | Schedule 120 (mm) | Schedule 140 (mm) | Schedule 160 (mm) | Double Extra Strong (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 | 33.4 | 1.65 | 2.00 | 2.77 | 3.18 | 2.11 | 3.38 | 3.68 | 4.78 | 5.54 | 6.10 | 7.11 | 7.92 | 8.51 | 9.53 |
| 25 | 42.2 | 1.65 | 2.00 | 2.77 | 3.18 | 2.11 | 3.56 | 3.91 | 5.05 | 5.85 | 6.35 | 7.62 | 8.56 | 9.27 | 10.31 |
| 40 | 53.4 | 2.11 | 2.41 | 3.40 | 4.06 | 3.18 | 4.47 | 5.08 | 6.35 | 7.01 | 7.87 | 9.09 | 10.16 | 10.92 | 12.07 |
| 50 | 60.3 | 2.77 | 3.40 | 4.10 | 4.57 | 4.06 | 5.16 | 5.74 | 7.62 | 8.18 | 9.53 | 10.92 | 11.91 | 12.70 | 13.97 |
| 80 | 88.9 | 3.18 | 4.06 | 5.54 | 6.35 | 5.16 | 6.35 | 7.01 | 9.19 | 9.53 | 10.92 | 12.16 | 13.97 | 15.09 | 16.92 |
| 100 | 114.3 | 4.06 | 4.57 | 6.35 | 7.62 | 6.35 | 7.87 | 8.56 | 11.11 | 12.19 | 13.46 | 15.24 | 17.48 | 18.42 | 19.81 |