Outer dimensions of ASME B16.5 flanges by size and class (150 to 2500): outside diameter, thickness, bolt circle, number and diameter of holes and raised face.
| NPS (in) | Class (lb) | Outside dia. D (mm) | Thickness B (mm) | Bolt circle K (mm) | Holes (n × Ø) (mm) | Raised face G (mm) |
|---|---|---|---|---|---|---|
| 1/2 | 150 | 88.9 ✓ | 11.2 | 60.3 ✓ | 4 × 15.9 ✓ | 34.9 |
| 1/2 | 300 | 95.2 ✓ | 14.2 | 66.5 ✓ | 4 × 15.9 ✓ | 34.9 |
| 1/2 | 600 | 95.2 ✓ | 14.2 | 66.5 ✓ | 4 × 15.9 ✓ | 34.9 |
| 1/2 | 900 | 120.6 ✓ | 22.4 | 82.5 ✓ | 4 × 22.2 ✓ | 34.9 |
| 1/2 | 1500 | 120.6 ✓ | 22.4 | 82.5 ✓ | 4 × 22.2 ✓ | 34.9 |
| 1/2 | 2500 | 133.3 ✓ | 30.2 | 88.9 ✓ | 4 × 22.2 ✓ | 34.9 |
| 3/4 | 150 | 98.6 ✓ | 12.7 | 69.9 ✓ | 4 × 15.9 ✓ | 42.9 |
| 3/4 | 300 | 117.3 ✓ | 15.7 | 82.6 ✓ | 4 × 19 ✓ | 42.9 |
| 3/4 | 600 | 117.3 ✓ | 15.7 | 82.6 ✓ | 4 × 19 ✓ | 42.9 |
| 3/4 | 900 | 130 ✓ | 25.4 | 88.9 ✓ | 4 × 22.2 ✓ | 42.9 |
| 3/4 | 1500 | 130 ✓ | 25.4 | 88.9 ✓ | 4 × 22.2 ✓ | 42.9 |
| 1 | 150 | 108 ✓ | 14.2 | 79.4 ✓ | 4 × 15.9 ✓ | 50.8 |
| 1 | 300 | 123.9 ✓ | 17.5 | 88.9 ✓ | 4 × 19 ✓ | 50.8 |
| 1 | 600 | 123.9 ✓ | 17.5 | 88.9 ✓ | 4 × 19 ✓ | 50.8 |
| 1 | 900 | 149.3 ✓ | 28.6 | 101.6 ✓ | 4 × 25.4 ✓ | 50.8 |
| 1 | 1500 | 149.3 ✓ | 28.6 | 101.6 ✓ | 4 × 25.4 ✓ | 50.8 |
| 1 | 2500 | 158.7 ✓ | 35.1 | 107.9 ✓ | 4 × 25.4 ✓ | 50.8 |
| 1-1/4 | 150 | 117.3 ✓ | 15.7 | 88.9 ✓ | 4 × 15.9 ✓ | 63.5 |
| 1-1/4 | 300 | 133.4 ✓ | 19.1 | 98.6 ✓ | 4 × 19 ✓ | 63.5 |
| 1-1/4 | 600 | 133.4 ✓ | 20.6 | 98.6 ✓ | 4 × 19 ✓ | 63.5 |
| 1-1/2 | 150 | 127 ✓ | 17.5 | 98.4 ✓ | 4 × 15.9 ✓ | 73 |
| 1-1/2 | 300 | 155.4 ✓ | 20.6 | 114.3 ✓ | 4 × 22.2 ✓ | 73 |
| 1-1/2 | 600 | 155.4 ✓ | 22.4 | 114.3 ✓ | 4 × 22.2 ✓ | 73 |
| 1-1/2 | 900 | 177.8 ✓ | 31.8 | 123.8 ✓ | 4 × 28.6 ✓ | 73 |
| 1-1/2 | 1500 | 177.8 ✓ | 31.8 | 123.8 ✓ | 4 × 28.6 ✓ | 73 |
| 1-1/2 | 2500 | 203.2 ✓ | 44.4 | 146 ✓ | 4 × 31.8 ✓ | 73 |
| 2 | 150 | 152.4 ✓ | 19.1 | 120.6 ✓ | 4 × 19 ✓ | 92.1 |
| 2 | 300 | 165.1 ✓ | 22.4 | 127 ✓ | 8 × 19 ✓ | 92.1 |
| 2 | 600 | 165.1 ✓ | 31.8 | 127 ✓ | 8 × 19 ✓ | 92.1 |
| 2 | 900 | 215.9 ✓ | 38.1 | 165.1 ✓ | 8 × 25.4 ✓ | 92.1 |
| 2 | 1500 | 215.9 ✓ | 38.1 | 165.1 ✓ | 8 × 25.4 ✓ | 92.1 |
| 2 | 2500 | 234.9 ✓ | 50.8 | 171.4 ✓ | 8 × 28.6 ✓ | 92.1 |
| 2-1/2 | 150 | 177.8 ✓ | 22.4 | 139.7 ✓ | 4 × 19 ✓ | 104.8 |
| 2-1/2 | 300 | 190.5 ✓ | 25.4 | 149.2 ✓ | 8 × 22.2 ✓ | 104.8 |
| 2-1/2 | 600 | 190.5 ✓ | 35.1 | 149.2 ✓ | 8 × 22.2 ✓ | 104.8 |
| 3 | 150 | 190.5 ✓ | 23.9 | 152.4 ✓ | 4 × 19 ✓ | 127 |
| 3 | 300 | 209.5 ✓ | 28.4 | 168.1 ✓ | 8 × 22.2 ✓ | 127 |
| 3 | 600 | 209.5 ✓ | 35.1 | 168.1 ✓ | 8 × 22.2 ✓ | 127 |
| 3 | 900 | 241.3 ✓ | 44.4 | 190.5 ✓ | 8 × 25.4 ✓ | 127 |
| 4 | 150 | 228.6 ✓ | 23.9 | 190.5 ✓ | 8 × 19 ✓ | 157.2 |
| 4 | 300 | 254 ✓ | 31.8 | 200 ✓ | 8 × 22.2 ✓ | 157.2 |
| 4 | 600 | 273 ✓ | 41.4 | 215.9 ✓ | 8 × 25.4 ✓ | 157.2 |
| 4 | 900 | 292.1 ✓ | 47.6 | 234.9 ✓ | 8 × 31.8 ✓ | 157.2 |
| 4 | 2500 | 355.6 ✓ | 82.5 | 273 ✓ | 8 × 41.3 ✓ | 157.2 |
| 6 | 150 | 279.4 ✓ | 25.4 | 241.3 ✓ | 8 × 22.2 ✓ | 215.9 |
| 6 | 300 | 317.5 ✓ | 36.6 | 269.7 ✓ | 12 × 22.2 ✓ | 215.9 |
| 6 | 600 | 355.6 ✓ | 47.8 | 292.1 ✓ | 12 × 28.6 ✓ | 215.9 |
| 6 | 900 | 381 ✓ | 55.5 | 317.5 ✓ | 12 × 31.8 ✓ | 215.9 |
| 8 | 150 | 342.9 ✓ | 28.6 | 298.5 ✓ | 8 × 22.2 ✓ | 269.9 |
| 8 | 300 | 381 ✓ | 41.1 | 330.2 ✓ | 12 × 25.4 ✓ | 269.9 |
| 8 | 600 | 419.1 ✓ | 55.6 | 349.2 ✓ | 12 × 31.8 ✓ | 269.9 |
| 8 | 900 | 469.9 ✓ | 63.5 | 393.7 ✓ | 12 × 38.1 ✓ | 269.9 |
| 10 | 150 | 406.4 ✓ | 30.2 | 362 ✓ | 12 × 25.4 ✓ | 323.8 |
| 10 | 300 | 444.5 ✓ | 47.8 | 387.4 ✓ | 16 × 28.6 ✓ | 323.8 |
| 12 | 150 | 482.6 ✓ | 31.8 | 431.8 ✓ | 12 × 25.4 ✓ | 381 |
| 12 | 300 | 520.7 ✓ | 50.8 | 450.9 ✓ | 16 × 31.8 ✓ | 381 |
| 16 | 150 | 596.9 ✓ | 36.6 | 539.8 ✓ | 16 × 28.6 ✓ | 469.9 |
| 16 | 300 | 647.7 ✓ | 57.2 | 571.5 ✓ | 20 × 35 ✓ | 469.9 |
| 20 | 150 | 698.5 ✓ | 42.9 | 635 ✓ | 20 × 31.8 ✓ | 584.2 |
| 24 | 150 | 812.8 ✓ | 47.8 | 749.3 ✓ | 20 × 35 ✓ | 692.2 |
| 24 | 300 | 914.4 ✓ | 70.1 | 812.8 ✓ | 24 × 41.3 ✓ | 692.2 |
Shared by the flange types of one class and size (weld neck, slip-on, blind…), as exact conversions of the standard's inches. From MyCustomPiping: only rows where its blind and weld-neck tables agree are published; the others had errors. For fabrication or purchase, use the current standard.
Source: MyCustomPiping (RamDj12049), CSV databases of the FreeCAD addon, LGPL-2.1; dimensions per ASME B16.5, B16.9 and B36.10M. ↗
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