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