All dimensions are in "mm" unless noted otherwise.
Dimensions of Class 2500 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 | 133.4 | 30.2 | 35.1 | 42.9 | 21.3 | 73.2 | 4 | 22.4 | 3/4 | 88.9 | 3 |
| 3/4 | 139.7 | 31.8 | 42.9 | 50.8 | 26.7 | 79.2 | 4 | 22.4 | 3/4 | 95.3 | 4 |
| 1 | 158.8 | 35.1 | 50.8 | 57.2 | 33.5 | 88.9 | 4 | 25.4 | 7/8 | 108 | 5 |
| 1-1/4 | 184.2 | 38.1 | 63.5 | 73.2 | 42.2 | 95.3 | 4 | 28.4 | 1 | 130 | 8 |
| 1-1/2 | 203.2 | 44.5 | 73.2 | 79.2 | 48.3 | 111.3 | 4 | 31.8 | 1-1/8 | 146.1 | 11 |
| 2 | 235 | 50.8 | 91.9 | 95.3 | 60.5 | 127 | 8 | 28.4 | 1 | 171.5 | 19 |
| 2-1/2 | 266.7 | 57.2 | 104.6 | 114.3 | 73.2 | 142.7 | 8 | 31.8 | 1-1/8 | 196.9 | 24 |
| 3 | 304.8 | 66.5 | 127 | 133.4 | 88.9 | 168.1 | 8 | 35.1 | 1-1/4 | 228.6 | 43 |
| 4 | 355.6 | 76.2 | 157.2 | 165.1 | 114.3 | 190.5 | 8 | 41.1 | 1-1/2 | 273.1 | 66 |
| 5 | 419.1 | 91.9 | 185.7 | 203.2 | 141.2 | 228.6 | 8 | 47.8 | 1-3/4 | 323.9 | 111 |
| 6 | 482.6 | 108 | 215.9 | 235 | 168.4 | 273.1 | 8 | 53.8 | 2 | 368.3 | 172 |
| 8 | 552.5 | 127 | 269.7 | 304.8 | 219.2 | 317.5 | 12 | 53.8 | 2 | 438.2 | 263 |
| 10 | 673.1 | 165.1 | 323.9 | 374.7 | 273.1 | 419.1 | 12 | 66.5 | 2-1/2 | 539.8 | 488 |
| 12 | 762 | 184.2 | 381 | 441.5 | 323.9 | 463.6 | 12 | 73.2 | 2-3/4 | 619.3 | 692 |