Gasket dimensions for flat ring and full face applications
BS 10 table H
| Nominal pipe size | Gasket ID | IBC gasket OD | Full face | Nominal pipe size | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Full face gasket OD | Diameter of bolt holes | Bolt P.C.D. | Number of bolt holes | |||||||||
| Inches | mm | Inches | mm | Inches | mm | Inches | mm | Inches | mm | |||
| 1/2 | 27/32 | 21.4 | 2 9/16 | 65.1 | 4 1/2 | 114.3 | 11/16 | 17.5 | 3 1/4 | 82.6 | 4 | 1/2 |
| 3/4 | 1 1/16 | 27.0 | 2 9/16 | 65.1 | 4 1/2 | 114.3 | 11/16 | 17.5 | 3 1/4 | 82.6 | 4 | 3/4 |
| 1 | 1 11/32 | 34.1 | 2 3/4 | 69.9 | 4 3/4 | 120.7 | 11/16 | 17.5 | 3 7/16 | 87.3 | 4 | 1 |
| 1 1/4 | 1 11/16 | 42.9 | 3 3/16 | 81.0 | 5 1/4 | 133.4 | 11/16 | 17.5 | 3 7/8 | 98.4 | 4 | 1 1/4 |
| 1 1/2 | 1 29/32 | 48.4 | 3 7/16 | 87.3 | 5 1/2 | 139.7 | 11/16 | 17.5 | 4 1/8 | 104.8 | 4 | 1 1/2 |
| 2 | 2 3/8 | 60.3 | 4 5/16 | 109.5 | 6 1/2 | 165.1 | 11/16 | 17.5 | 5 | 127.0 | 4 | 2 |
| 2 1/2 | 3 | 76.2 | 5 1/16 | 128.6 | 7 1/4 | 184.2 | 11/16 | 17.5 | 5 3/4 | 146.1 | 8 | 2 1/2 |
| 3 | 3 1/2 | 88.9 | 5 13/16 | 147.6 | 8 | 203.2 | 11/16 | 17.5 | 6 1/2 | 165.1 | 8 | 3 |
| 3 1/2 | 4 | 101.6 | 6 5/16 | 160.3 | 8 1/2 | 215.9 | 11/16 | 17.5 | 7 | 177.8 | 8 | 3 1/2 |
| 4 | 4 1/2 | 114.3 | 6 13/16 | 173.0 | 9 | 228.6 | 11/16 | 17.5 | 7 1/2 | 190.5 | 8 | 4 |
| 5 | 5 1/2 | 139.7 | 8 3/8 | 212.7 | 11 | 279.4 | 7/8 | 22.2 | 9 1/4 | 235.0 | 8 | 5 |
| 6 | 6 5/8 | 168.3 | 9 3/8 | 238.1 | 12 | 304.8 | 7/8 | 22.2 | 10 1/4 | 260.4 | 12 | 6 |
| 7 | 7 5/8 | 193.7 | 10 5/8 | 269.9 | 13 1/4 | 336.6 | 7/8 | 22.2 | 11 1/2 | 292.1 | 12 | 7 |
| 8 | 8 5/8 | 219.1 | 11 7/8 | 301.6 | 14 1/2 | 368.3 | 7/8 | 22.2 | 12 3/4 | 323.9 | 12 | 8 |
| 9 | 9 5/8 | 244.5 | 13 | 330.2 | 16 | 406.4 | 1 | 25.4 | 14 | 355.6 | 12 | 9 |
| 10 | 10 3/4 | 273.1 | 14 | 355.6 | 17 | 431.8 | 1 | 25.4 | 15 | 381.0 | 12 | 10 |
| 12 | 12 3/4 | 323.9 | 16 1/4 | 412.8 | 19 1/4 | 489.0 | 1 | 25.4 | 17 1/4 | 438.2 | 16 | 12 |
| 13 | 14 | 355.6 | 17 3/8 | 441.3 | 20 3/4 | 527.1 | 1 1/8 | 28.6 | 18 1/2 | 469.9 | 16 | 13 |
| 14 | 15 | 381.0 | 18 3/8 | 466.7 | 21 3/4 | 552.5 | 1 1/8 | 28.6 | 19 1/2 | 495.3 | 16 | 14 |
| 15 | 16 | 406.4 | 19 3/8 | 492.1 | 22 3/4 | 577.9 | 1 1/8 | 28.6 | 20 1/2 | 520.7 | 16 | 15 |
| 16 | 17 | 431.8 | 20 5/8 | 523.9 | 24 | 609.6 | 1 1/8 | 28.6 | 21 3/4 | 552.5 | 20 | 16 |
| 17 | 18 | 457.2 | 21 7/8 | 555.6 | 25 1/4 | 641.4 | 1 1/8 | 28.6 | 23 | 584.2 | 20 | 17 |
| 18 | 19 | 482.6 | 22 3/4 | 577.9 | 26 1/2 | 673.1 | 1 1/4 | 31.8 | 24 | 609.6 | 20 | 18 |
| 19 | 20 | 508.0 | 24 | 609.6 | 27 3/4 | 704.9 | 1 1/4 | 31.8 | 25 1/4 | 641.4 | 20 | 19 |
| 20 | 21 | 533.4 | 25 1/4 | 641.4 | 29 | 736.6 | 1 1/4 | 31.8 | 26 1/2 | 673.1 | 24 | 20 |
| 21 | 22 | 558.8 | 26 1/4 | 666.8 | 30 | 762.0 | 1 1/4 | 31.8 | 27 1/2 | 698.5 | 24 | 21 |
| 22 | 23 | 584.2 | 27 1/4 | 692.2 | 31 | 787.4 | 1 1/4 | 31.8 | 28 1/2 | 723.9 | 24 | 22 |
| 23 | 24 | 609.6 | 28 3/8 | 720.7 | 32 1/2 | 825.5 | 1 3/8 | 34.9 | 29 3/4 | 755.7 | 24 | 23 |
| 24 | 25 | 635.0 | 29 3/8 | 746.1 | 33 1/2 | 850.9 | 1 3/8 | 34.9 | 30 3/4 | 781.1 | 24 | 24 |
