BS Table H Flange Dimensions
| Nominal | Dia. of Flange | I.D. of Flange | Dia. of Bolt Circle | No. of | Dia. of Bolt | Thickness |
| Pipe Size | D | d5 | k | Holes | d2 | b |
| 1/2" | 3.3/4" | 7/8" | 2.5/8" | 4 | 1/2" | 3/8" |
| 3/4" | 4" | 1.3/32" | 2.7/8" | 4 | 1/2" | 3/8" |
| 1" | 4.3/4" | 1.23/64" | 3.7/16" | 4 | 5/8" | 3/8" |
| 1.1/4" | 5.1/4" | 1.45/64" | 3.7/8" | 4 | 5/8" | 1/2" |
| 1.1/2" | 5.1/2" | 1.15/16" | 4.1/8" | 4 | 5/8" | 1/2" |
| 2" | 6.1/2" | 2.7/16" | 5" | 4 | 5/8" | 5/8" |
| 2.1/2 | 7.1/4" | 2.15/16" | 5.3/4" | 8 | 5/8" | 5/8" |
| 3" | 8" | 3.37/64" | 6.1/2" | 8 | 5/8" | 5/8" |
| 3.1/2" | 8.1/2" | 4.5/64" | 7" | 8 | 5/8" | 3/4" |
| 4" | 9" | 4.37/64" | 7.1/2" | 8 | 5/8" | 3/4" |
| 5" | 11" | 5.43/64" | 9.1/4" | 8 | 3/4" | 7/8" |
| 6" | 12" | 6.23/32" | 10.1/4" | 12 | 3/4" | 7/8" |
| 7" | 13.1/4" | 7.5/8" | 11.1/2" | 12 | 3/4" | 7/8" |
| 8' | 14.1/2" | 8.23/32" | 12.3/4" | 12 | 3/4" | 1" |
| 9" | 16" | 9.23/32" | 14" | 12 | 7/8" | 1" |
| 10" | 17" | 10.7/8" | 15" | 12 | 7/8" | 1" |
| 12" | 19.1/4" | 12.7/8" | 17.1/4" | 16 | 7/8" | 1/1/8" |
| 14" | 21.3/4" | 14.9/64" | 19.1/2" | 16 | 1" | 1.1/4" |
| 16" | 24" | 16.5/32" | 21.3/4" | 20 | 1" | 1.1/4" |
| 18" | 26.1/2" | 18.3/16" | 24" | 20 | 1.1/8" | 1.3/8" |
| 20" | 29" | 20.13/16" | 26.1/2" | 24 | 1.1/8" | 1.1/2" |
| 24" | 33.1/2" | 24.1/4" | 30.3/4" | 24 | 1.1/4" | 1.5/8" |
