All dimensions are in "mm" unless noted otherwise.
Dimensions of Class 900 Lap Joint Flanges as per ASME B16.5.
| Nominal Pipe Size |
Outside diameter of flange (D) |
Thick of flange (B) |
Diameter of Hub at base (A) |
Length thru Hub (H) |
Dia of bore (ID) |
Fillet radius (r) |
No of holes |
Dia of holes (L) |
Dia of bolts |
Diam of bolt circle (K) |
Approx weight kg |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 120.7 | 22.4 | 38.1 | 31.8 | 22.9 | 3 | 4 | 22.4 | 3/4 | 82.6 | 2 |
| 3/4 | 130 | 25.4 | 44.5 | 35.1 | 28.2 | 3 | 4 | 22.4 | 3/4 | 88.9 | 2 |
| 1 | 149.4 | 28.4 | 52.3 | 41.1 | 35.1 | 3 | 4 | 25.4 | 7/8 | 101.6 | 4 |
| 1-1/4 | 158.8 | 28.4 | 63.5 | 41.1 | 43.7 | 4.8 | 4 | 25.4 | 7/8 | 111.3 | 4 |
| 1-1/2 | 177.8 | 31.8 | 69.9 | 44.5 | 50 | 6.4 | 4 | 28.4 | 1 | 124 | 5 |
| 2 | 215.9 | 38.1 | 104.6 | 57.2 | 62.5 | 7.9 | 8 | 25.4 | 7/8 | 165.1 | 11 |
| 2-1/2 | 244.3 | 41.1 | 124 | 63.5 | 75.4 | 7.9 | 8 | 28.4 | 1 | 190.5 | 16 |
| 3 | 241.3 | 38.1 | 127 | 53.8 | 91.4 | 9.7 | 8 | 25.4 | 7/8 | 190.5 | 11 |
| 4 | 292.1 | 44.5 | 158.8 | 69.9 | 116.8 | 11.2 | 8 | 31.8 | 1-1/8 | 235 | 23 |
| 5 | 349.3 | 50.8 | 190.5 | 79.2 | 144.5 | 11.2 | 8 | 35.1 | 1-1/4 | 279.4 | 37 |
| 6 | 381 | 55.6 | 235 | 85.9 | 171.5 | 12.7 | 12 | 31.8 | 1-1/8 | 317.5 | 48 |
| 8 | 469.9 | 63.5 | 298.5 | 114.3 | 222.3 | 12.7 | 12 | 38.1 | 1-3/8 | 393.7 | 86 |
| 10 | 546.1 | 69.9 | 368.3 | 127 | 277.4 | 12.7 | 16 | 38.1 | 1-3/8 | 469.9 | 125 |
| 12 | 609.6 | 79.2 | 419.1 | 142.7 | 328.2 | 12.7 | 20 | 38.1 | 1-3/8 | 533.4 | 168 |
| 14 | 641.4 | 85.9 | 450.9 | 155.4 | 360.2 | 12.7 | 20 | 41.1 | 1-1/2 | 558.8 | 188 |
| 16 | 704.9 | 88.9 | 508 | 165.1 | 411.2 | 12.7 | 20 | 44.5 | 1-5/8 | 616 | 211 |
| 18 | 787.4 | 101.6 | 565.2 | 190.5 | 462.3 | 12.7 | 20 | 50.8 | 1-7/8 | 685.8 | 295 |
| 20 | 857.3 | 108 | 622.3 | 209.6 | 514.4 | 12.7 | 20 | 53.8 | 2 | 749.3 | 367 |
| 24 | 1041.4 | 139.7 | 749.3 | 266.7 | 616 | 12.7 | 20 | 66.5 | 2-1/2 | 901.7 | 703 |