All dimensions are in "mm" unless noted otherwise.
Dimensions of Class 900 RF Weld Neck Flanges as per ASME B16.5.
| Nominal Pipe Size |
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 | 120.7 | 22.4 | 35.1 | 38.1 | 21.3 | 60.5 | 4 | 22.4 | 3/4 | 82.6 | 2 |
| 3/4 | 130 | 25.4 | 42.9 | 44.5 | 26.7 | 69.9 | 4 | 22.4 | 3/4 | 88.9 | 3 |
| 1 | 149.4 | 28.4 | 50.8 | 52.3 | 33.5 | 73.2 | 4 | 25.4 | 7/8 | 101.6 | 4 |
| 1-1/4 | 158.8 | 28.4 | 63.5 | 63.5 | 42.2 | 73.2 | 4 | 25.4 | 7/8 | 111.3 | 5 |
| 1-1/2 | 177.8 | 31.8 | 73.2 | 69.9 | 48.3 | 82.6 | 4 | 28.4 | 1 | 124 | 6 |
| 2 | 215.9 | 38.1 | 91.9 | 104.6 | 60.5 | 101.6 | 8 | 25.4 | 7/8 | 165.1 | 11 |
| 2-1/2 | 244.3 | 41.1 | 104.6 | 124 | 73.2 | 104.6 | 8 | 28.4 | 1 | 190.5 | 16 |
| 3 | 241.3 | 38.1 | 127 | 127 | 88.9 | 101.6 | 8 | 25.4 | 7/8 | 190.5 | 14 |
| 4 | 292.1 | 44.5 | 157.2 | 158.8 | 114.3 | 114.3 | 8 | 31.8 | 1-1/8 | 235 | 24 |
| 5 | 349.3 | 50.8 | 185.7 | 190.5 | 141.2 | 127 | 8 | 35.1 | 1-1/4 | 279.4 | 39 |
| 6 | 381 | 55.6 | 215.9 | 235 | 168.4 | 139.7 | 12 | 31.8 | 1-1/8 | 317.5 | 50 |
| 8 | 469.9 | 63.5 | 269.7 | 298.5 | 219.2 | 162.1 | 12 | 38.1 | 1-3/8 | 393.7 | 79 |
| 10 | 546.1 | 69.9 | 323.9 | 368.3 | 273.1 | 184.2 | 16 | 38.1 | 1-3/8 | 469.9 | 118 |
| 12 | 689.6 | 79.2 | 381 | 419.1 | 323.9 | 200.2 | 20 | 38.1 | 1-3/8 | 533.4 | 147 |
| 14 | 641.4 | 85.9 | 412.8 | 450.9 | 355.6 | 212.9 | 20 | 41.1 | 1-1/2 | 558.8 | 181 |
| 16 | 704.9 | 88.9 | 469.9 | 508 | 406.4 | 215.9 | 20 | 44.5 | 1-5/8 | 616 | 225 |
| 18 | 787.4 | 101.6 | 533.4 | 565.2 | 457.2 | 228.6 | 20 | 50.8 | 1-7/8 | 685.8 | 308 |
| 20 | 857.3 | 108 | 584.2 | 622.3 | 508 | 247.7 | 20 | 53.8 | 2 | 749.3 | 376 |
| 24 | 1041.3 | 139.7 | 692.2 | 749.3 | 609.6 | 292.1 | 20 | 66.5 | 2-1/2 | 901.7 | 680 |