STEEL PIPE SIZE CHART
| DN | NPS | OD mm | Sch 10 | Sch 20 | Sch 30 | Sch 40 | STD |
| 6 | ⅛ | 10.3 | 1.24 | 1.45 | 1.73 | 1.73 | |
| 8 | ¼ | 13.7 | 1.65 | 1.85 | 2.24 | 2.24 | |
| 10 | ⅜ | 17.1 | 1.65 | 1.85 | 2.31 | 2.31 | |
| 15 | ½ | 21.3 | 2.11 | 2.41 | 2.77 | 2.77 | |
| 20 | ¾ | 26.7 | 2.11 | 2.41 | 2.87 | 2.87 | |
| 25 | 1 | 33.4 | 2.77 | 2.90 | 3.38 | 3.38 | |
| 32 | 1¼ | 42.2 | 2.77 | 2.97 | 3.56 | 3.56 | |
| 40 | 1½ | 48.3 | 2.77 | 3.18 | 3.68 | 3.68 | |
| 50 | 2 | 60.3 | 2.77 | 3.18 | 3.91 | 3.91 | |
| 65 | 2½ | 73.0 | 3.05 | 4.78 | 5.16 | 5.16 | |
| 80 | 3 | 88.9 | 3.05 | 4.78 | 5.49 | 5.49 | |
| 90 | 3½ | 101.6 | 3.05 | 4.78 | 5.74 | 5.74 | |
| 100 | 4 | 114.3 | 3.05 | 4.78 | 6.02 | 6.02 | |
| 125 | 5 | 141.3 | 3.40 | 6.55 | 6.55 | ||
| 150 | 6 | 168.3 | 3.40 | 7.11 | 7.11 | ||
| 200 | 8 | 219.1 | 3.76 | 6.35 | 7.04 | 8.18 | 8.18 |
| 250 | 10 | 273.1 | 4.19 | 6.35 | 7.80 | 9.27 | 9.27 |
| 300 | 12 | 323.9 | 4.57 | 6.35 | 8.38 | 10.31 | 9.53 |
| 350 | 14 | 355.6 | 6.35 | 7.92 | 9.53 | 11.13 | 9.53 |
| 400 | 16 | 406.4 | 6.35 | 7.92 | 9.53 | 12.70 | 9.53 |
| 450 | 18 | 457 | 6.35 | 7.92 | 11.13 | 14.27 | 9.53 |
| 500 | 20 | 508 | 6.35 | 9.53 | 12.70 | 15.09 | 9.53 |
| 550 | 22 | 559 | 6.35 | 9.53 | 12.70 | 9.53 | |
| 600 | 24 | 610 | 6.35 | 9.53 | 14.27 | 17.48 | 9.53 |
| 650 | 26 | 660 | 7.92 | 12.70 | 9.53 | ||
| 700 | 28 | 711 | 7.92 | 12.70 | 15.88 | 9.53 | |
| 750 | 30 | 762 | 7.92 | 12.70 | 15.88 | 9.53 |