All dimensions are in "mm" unless noted otherwise.
Dimensions of Class 150 RF Weld Neck Flanges as per ASME B16.5.
| NPS (in) | Outside Dia of Flange (O) |
Thick of Flange (C) |
Dia of Raised Face (R) |
Dia of Hub at Base (X) |
Dia of Hub at End (A) |
Length thru Hub (V) |
No of Holes |
Dia of Holes (H) |
Dia of Bolts |
Dia of Bolt Circle (B) |
Approx weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 88.9 | 11.2 | 35.1 | 30.2 | 21.3 | 47.8 | 4 | 15.7 | 1/2 | 60.5 | 1 |
| 3/4 | 98.6 | 12.7 | 42.9 | 38.1 | 26.7 | 52.3 | 4 | 15.7 | 1/2 | 69.9 | 1 |
| 1 | 108 | 14.2 | 50.8 | 49.3 | 33.5 | 55.6 | 4 | 15.7 | 1/2 | 79.2 | 1 |
| 1-1/4 | 117.3 | 15.7 | 63.5 | 58.7 | 42.2 | 57.2 | 4 | 15.7 | 1/2 | 88.9 | 1 |
| 1-1/2 | 127 | 17.5 | 73.2 | 65 | 48.3 | 62 | 4 | 15.7 | 1/2 | 98.6 | 2 |
| 2 | 152.4 | 19.1 | 91.9 | 77.7 | 60.5 | 63.5 | 4 | 19.1 | 5/8 | 120.7 | 3 |
| 2-1/2 | 177.8 | 22.4 | 104.6 | 90.4 | 73.2 | 69.9 | 4 | 19.1 | 5/8 | 139.7 | 4 |
| 3 | 190.5 | 23.9 | 127 | 108 | 88.9 | 69.9 | 4 | 19.1 | 5/8 | 152.4 | 5 |
| 3-1/2 | 215.9 | 23.9 | 139.7 | 122.2 | 101.6 | 71.4 | 8 | 19.1 | 5/8 | 177.8 | 5 |
| 4 | 228.6 | 23.9 | 157.2 | 134.9 | 114.3 | 76.2 | 8 | 19.1 | 5/8 | 190.5 | 7 |
| 5 | 254 | 23.9 | 185.7 | 163.6 | 141.2 | 88.9 | 8 | 22.4 | 3/4 | 215.9 | 9 |
| 6 | 279.4 | 25.4 | 215.9 | 192 | 168.4 | 88.9 | 8 | 22.4 | 3/4 | 241.3 | 11 |
| 8 | 342.9 | 28.4 | 269.7 | 246.1 | 219.2 | 101.6 | 8 | 22.4 | 3/4 | 298.5 | 18 |
| 10 | 406.4 | 30.2 | 323.9 | 304.8 | 273.1 | 101.6 | 12 | 25.4 | 7/8 | 362 | 24 |
| 12 | 482.6 | 31.8 | 381 | 365.3 | 323.9 | 114.3 | 12 | 25.4 | 7/8 | 431.8 | 36 |
| 14 | 533.4 | 35.1 | 421.8 | 400.1 | 355.6 | 127 | 12 | 28.4 | 1 | 476.3 | 50 |
| 16 | 596.6 | 36.6 | 469.9 | 457.2 | 406.4 | 127 | 16 | 28.4 | 1 | 539.8 | 64 |
| 18 | 635 | 39.6 | 533.4 | 505 | 457.2 | 139.7 | 16 | 31.8 | 1-1/8 | 577.9 | 68 |
| 20 | 698.5 | 42.9 | 584.2 | 558.8 | 508 | 144.5 | 20 | 31.8 | 1-1/8 | 635 | 82 |
| 24 | 812.8 | 47.8 | 692.2 | 663.4 | 609.6 | 152.4 | 20 | 35.1 | 1-1/4 | 749.3 | 118 |