BS 10 — Table F Flange Dimensions
BS 10 Table F Flange Dimensions — 39 sizes.
| Size — · in | Size — · mm | D — Flange OD · in (in) | D — Flange OD · mm (mm) | C — Steel, heavy series · in (in) | C — Steel, heavy series · mm (mm) | C — Steel, light series · in (in) | C — Cast iron · in (in) | K — Bolt circle · in (in) | K — Bolt circle · mm (mm) | n — Bolts | L — Hole dia · in (in) | L — Hole dia · mm (mm) | Bolt — Size · in (in) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 15 | 3 3/4 | 95 | 3/8 | 10 | 3/8 | 1/2 | 2 5/8 | 67 | 4 | 9/16 | 14 | 1/2 |
| 3/4 | 20 | 4 | 102 | 3/8 | 10 | 3/8 | 1/2 | 2 7/8 | 73 | 4 | 9/16 | 14 | 1/2 |
| 1 | 25 | 4 3/4 | 121 | 3/8 | 10 | 3/8 | 1/2 | 3 7/16 | 87 | 4 | 11/16 | 17 | 5/8 |
| 1 1/4 | 32 | 5 1/4 | 133 | 1/2 | 13 | 1/2 | 5/8 | 3 7/8 | 98 | 4 | 11/16 | 17 | 5/8 |
| 1 1/2 | 40 | 5 1/2 | 140 | 1/2 | 13 | 1/2 | 5/8 | 4 1/8 | 105 | 4 | 11/16 | 17 | 5/8 |
| 2 | 50 | 6 1/2 | 165 | 5/8 | 16 | 5/8 | 3/4 | 5 | 127 | 4 | 11/16 | 17 | 5/8 |
| 2 1/2 | 65 | 7 1/4 | 184 | 5/8 | 16 | 5/8 | 3/4 | 5 3/4 | 146 | 8 | 11/16 | 17 | 5/8 |
| 3 | 80 | 8 | 203 | 5/8 | 16 | 5/8 | 3/4 | 6 1/2 | 165 | 8 | 11/16 | 17 | 5/8 |
| 3 1/2 | — | 8 1/2 | — | — | — | 3/4 | — | 7 | — | 8 | — | — | 5/8 |
| 4 | 100 | 9 | 229 | 3/4 | 19 | 3/4 | 7/8 | 7 1/2 | 191 | 8 | 11/16 | 17 | 5/8 |
| 5 | 125 | 11 | 279 | 7/8 | 22 | 7/8 | 1 | 9 1/4 | 235 | 8 | 7/8 | 22 | 3/4 |
| 6 | 150 | 12 | 305 | 7/8 | 22 | 7/8 | 1 | 10 1/4 | 260 | 12 | 7/8 | 22 | 3/4 |
| 7 | 175 | 13 1/4 | — | — | — | 7/8 | — | 11 1/2 | — | 12 | 7/8 | — | 3/4 |
| 8 | 200 | 14 1/2 | 368 | 1 | 25 | 1 | 1 1/8 | 12 3/4 | 324 | 12 | 7/8 | 22 | 3/4 |
| 9 | 225 | 16 | — | — | — | 1 1/8 | — | 14 | — | 12 | 1 | — | 7/8 |
| 10 | 250 | 17 | 432 | 1 | 25 | 1 1/8 | 1 1/8 | 15 | 381 | 12 | 1 | 25 | 7/8 |
| 12 | 300 | 19 1/4 | 489 | 1 1/8 | 29 | 1 1/4 | 1 1/4 | 17 1/4 | 438 | 16 | 1 | 25 | 7/8 |
| 13 | — | 20 3/4 | — | — | — | 1 3/8 | — | 18 1/2 | — | 16 | 1 1/8 | — | 1 |
| 14 | 350 | 21 3/4 | 552 | 1 1/4 | 32 | 1 3/8 | 1 3/8 | 19 1/2 | 495 | 16 | 1 1/8 | 29 | 1 |
| 15 | 375 | 22 3/4 | 578 | — | — | 1 1/2 | — | 20 1/2 | 521 | 16 | 1 1/8 | 29 | 1 |
| 16 | 400 | 24 | 610 | 1 1/4 | 32 | 1 5/8 | 1 3/8 | 21 3/4 | 552 | 20 | 1 1/8 | 29 | 1 |
| 17 | — | 25 1/4 | — | — | — | 1 3/4 | — | 23 | — | 20 | 1 1/8 | — | 1 |
| 18 | 450 | 26 1/2 | 673 | 1 3/8 | 35 | 1 3/4 | 1 1/2 | 24 | 610 | 20 | 1 1/4 | 32 | 1 1/8 |
| 19 | — | 27 3/4 | — | — | — | 1 3/4 | — | 25 1/4 | — | 20 | 1 1/4 | — | 1 1/8 |
| 20 | 500 | 29 | 737 | 1 1/2 | 38 | 2 | 1 5/8 | 26 1/2 | 673 | 24 | 1 1/4 | 32 | 1 1/8 |
| 21 | — | 30 | — | — | — | 2 | — | 27 1/2 | — | 24 | 1 1/4 | — | 1 1/8 |
| 22 | — | 31 | — | — | — | 2 1/8 | — | 28 1/2 | — | 24 | 1 3/8 | — | — |
| 23 | — | 32 1/2 | — | — | — | 2 1/4 | — | 29 3/4 | — | 24 | 1 3/8 | — | 1 1/4 |
| 24 | 600 | 33 1/2 | 851 | 1 5/8 | 41 | 2 1/4 | 1 3/4 | 30 3/4 | 781 | 24 | 1 3/8 | 35 | 1 1/4 |
| 27 | — | 36 3/4 | — | — | — | — | — | 33 3/4 | — | 24 | 1 3/8 | — | 1 1/4 |
| 29 | — | 39 | — | — | — | — | — | 36 | — | 24 | 1 3/8 | — | 1 1/4 |
| 30 | — | 40 | — | — | — | — | — | 37 | — | 28 | 1 3/8 | — | 1 1/4 |
| 33 | — | 43 | — | — | — | — | — | 40 | — | 32 | 1 3/8 | — | 1 1/4 |
| 35 | — | 45 3/4 | — | — | — | — | — | 42 1/2 | — | 32 | 1 1/2 | — | 1 3/8 |
| 36 | — | 46 3/4 | — | — | — | — | — | 43 1/2 | — | 32 | 1 1/2 | — | 1 3/8 |
| 39 | — | 50 1/4 | — | — | — | — | — | 47 | — | 36 | 1 1/2 | — | 1 3/8 |
| 42 | — | 53 1/4 | — | — | — | — | — | 50 | — | 36 | 1 1/2 | — | 1 3/8 |
| 45 | — | 57 | — | — | — | — | — | 53 1/2 | — | 36 | 1 5/8 | — | 1 1/2 |
| 48 | — | 60 1/4 | — | — | — | — | — | 56 3/4 | — | 40 | 1 5/8 | — | 1 1/2 |
- Inch and millimetre values are given as published; BS 10 is an inch standard.
- BS 10 is withdrawn and superseded by BS EN 1092-1, but Table D, E, F and H drilling is still widely used on existing plant, marine and UK-pattern equipment.
- Two steel thickness series are published for BS 10 Table F: a heavier series (forged / cast steel) and a lighter plate series. Confirm which applies to your flange type.
- Values are nominal, compiled from published copies of the standard; blank cells (—) are values not confirmed from the sources available. Verify against the current edition before design, purchase or fabrication.