All dimensions are in "mm" unless noted otherwise.
Dimensions of Class 300 RF Blind Flanges as per ASME B16.5.
| Nominal Pipe Size |
OD of Flange (D) |
Thickness of Flange (B) |
Dia of Raised Face (G) |
No of Bolt Holes |
Dia of Bolt Holes (L) |
Dia of Bolt (inches) |
Dia of Bolt Circle (K) |
Approx Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 1/2 | 95.3 | 14.2 | 35.1 | 4 | 15.7 | 1/2 | 66.5 | 1 |
| 3/4 | 117.3 | 15.7 | 42.9 | 4 | 19.1 | 1/2 | 82.6 | 1 |
| 1 | 124 | 17.5 | 50.8 | 4 | 19.1 | 1/2 | 88.9 | 1 |
| 1-1/4 | 133.4 | 19.1 | 63.5 | 4 | 19.1 | 1/2 | 98.6 | 2 |
| 1-1/2 | 155.4 | 20.6 | 73.2 | 4 | 22.4 | 1/2 | 114.3 | 3 |
| 2 | 165.1 | 22.4 | 91.9 | 8 | 19.1 | 5/8 | 127 | 4 |
| 2-1/2 | 190.5 | 25.4 | 104.6 | 8 | 22.4 | 5/8 | 149.4 | 5 |
| 3 | 209.6 | 28.4 | 127 | 8 | 22.4 | 5/8 | 168.1 | 7 |
| 3-1/2 | 228.6 | 30.2 | 139.7 | 8 | 22.4 | 5/8 | 184.2 | 10 |
| 4 | 254 | 31.8 | 157.2 | 8 | 22.4 | 5/8 | 200.2 | 12 |
| 5 | 279.4 | 35.1 | 185.7 | 8 | 22.4 | 5/8 | 235 | 16 |
| 6 | 317.5 | 36.6 | 215.9 | 12 | 22.4 | 3/4 | 269.7 | 23 |
| 8 | 381 | 41.1 | 269.7 | 12 | 25.4 | 3/4 | 330.2 | 37 |
| 10 | 444.5 | 47.8 | 323.9 | 16 | 28.4 | 1 | 387.4 | 56 |
| 12 | 520.7 | 50.8 | 381 | 16 | 31.8 | 1-1/8 | 450.9 | 84 |
| 14 | 584.2 | 53.8 | 412.8 | 20 | 31.8 | 1-1/8 | 514.4 | 113 |
| 16 | 647.7 | 57.2 | 469.9 | 20 | 35.1 | 1-1/4 | 571.5 | 134 |
| 18 | 711.2 | 60.5 | 533.4 | 24 | 35.1 | 1-1/4 | 628.7 | 179 |
| 20 | 774.7 | 63.5 | 584.2 | 24 | 35.1 | 1-1/4 | 685.8 | 229 |
| 24 | 914.4 | 69.9 | 692.2 | 24 | 41.1 | 1-1/2 | 812.8 | 358 |