All dimensions are in "mm" unless noted otherwise.
Dimensions of Class 300 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 | 95.3 | 14.2 | 38.1 | 22.4 | 22.9 | 3 | 4 | 15.7 | 1/2 | 66.5 | 1 |
| 3/4 | 117.3 | 15.7 | 47.8 | 25.4 | 28.2 | 3 | 4 | 19.1 | 5/8 | 82.6 | 1 |
| 1 | 124 | 17.5 | 53.8 | 26.9 | 35.1 | 3 | 4 | 19.1 | 5/8 | 88.9 | 1 |
| 1-1/4 | 133.4 | 19.1 | 63.5 | 26.9 | 43.7 | 4.8 | 4 | 19.1 | 5/8 | 98.6 | 2 |
| 1-1/2 | 155.4 | 20.6 | 69.9 | 30.2 | 50 | 6.4 | 4 | 22.4 | 3/4 | 114.3 | 3 |
| 2 | 165.1 | 22.4 | 84.1 | 33.3 | 62.5 | 7.9 | 8 | 19.1 | 5/8 | 127 | 3 |
| 2-1/2 | 190.5 | 25.4 | 100.1 | 38.1 | 75.4 | 7.9 | 8 | 22.4 | 3/4 | 149.4 | 5 |
| 3 | 209.6 | 28.4 | 117.3 | 42.9 | 91.4 | 9.7 | 8 | 22.4 | 3/4 | 168.1 | 6 |
| 3-1/2 | 228.6 | 30.2 | 133.4 | 44.5 | 104.1 | 9.7 | 8 | 22.4 | 3/4 | 184.2 | 8 |
| 4 | 254 | 31.8 | 146.1 | 47.8 | 116.8 | 11.2 | 8 | 22.4 | 3/4 | 200.2 | 10 |
| 5 | 279.4 | 35.1 | 177.8 | 50.8 | 144.5 | 11.2 | 8 | 22.4 | 3/4 | 235 | 13 |
| 6 | 317.5 | 36.6 | 206.2 | 52.3 | 171.5 | 12.7 | 12 | 22.4 | 3/4 | 269.7 | 18 |
| 8 | 381 | 41.1 | 260.4 | 62 | 222.3 | 12.7 | 12 | 25.4 | 7/8 | 330.2 | 26 |
| 10 | 444.5 | 47.8 | 320.5 | 95.3 | 277.4 | 12.7 | 16 | 28.4 | 1 | 387.4 | 41 |
| 12 | 520.7 | 50.8 | 374.7 | 101.6 | 328.2 | 12.7 | 16 | 31.8 | 1-1/8 | 450.9 | 64 |
| 14 | 584.2 | 53.8 | 425.5 | 111.3 | 360.2 | 12.7 | 20 | 31.8 | 1-1/8 | 514.4 | 86 |
| 16 | 647.7 | 57.2 | 482.6 | 120.7 | 411.2 | 12.7 | 20 | 35.1 | 1-1/4 | 571.5 | 113 |
| 18 | 711.2 | 60.5 | 533.4 | 130 | 462.3 | 12.7 | 24 | 35.1 | 1-1/4 | 628.7 | 134 |
| 20 | 774.7 | 63.5 | 587.2 | 139.7 | 514.4 | 12.7 | 24 | 35.1 | 1-1/4 | 685.8 | 168 |
| 24 | 914.4 | 69.9 | 701.5 | 152.4 | 616 | 12.7 | 24 | 41.1 | 1-1/4 | 812.8 | 249 |