BS 10 — BS 10 flanges — Table H
BS 10 BS 10 flanges — Table H — 19 sizes.
| NPS | Flange OD (mm) | PCD (mm) | No. of bolts | Bolt dia (mm) | Thickness (mm) |
|---|---|---|---|---|---|
| 1/2 | 114.3 | 82.6 | 4 | 15.9 | 12.7 |
| 3/4 | 114.3 | 82.6 | 4 | 15.9 | 12.7 |
| 1 | 120.78 | 87.3 | 4 | 15.9 | 14.3 |
| 1-1/4 | 133.4 | 98.4 | 4 | 15.9 | 17.5 |
| 1-1/2 | 139.7 | 104.8 | 4 | 15.9 | 17.5 |
| 2 | 165.1 | 127 | 4 | 15.9 | 19.1 |
| 2-1/2 | 184.2 | 146.1 | 8 | 15.9 | 19.1 |
| 3 | 203.2 | 165.1 | 8 | 15.9 | 22.2 |
| 4 | 228.6 | 190.5 | 8 | 15.9 | 25.4 |
| 5 | 279.4 | 235 | 8 | 19.1 | 28.6 |
| 6 | 304.8 | 260.4 | 12 | 19.1 | 28.6 |
| 8 | 368.3 | 323.9 | 12 | 19.1 | 31.8 |
| 10 | 431.8 | 381 | 12 | 22.2 | 34.9 |
| 12 | 489 | 438.2 | 16 | 22.2 | 38.1 |
| 14 | 552.5 | 495.3 | 16 | 25.4 | 41.3 |
| 16 | 609.6 | 552.5 | 20 | 25.4 | 44.5 |
| 18 | 673.1 | 609.6 | 20 | 28.6 | 47.6 |
| 20 | 736.6 | 673.1 | 24 | 28.6 | 50.8 |
| 24 | 850.9 | 781.1 | 24 | 31.8 | 57.2 |
- Table H: working steam pressure above 150 up to 250 psi.
- Metallect and Marcel Forged agree on all rows they share; Rajtilak matches 2-12"; Delvin Flow matches 14" (552/495/16x1"/41). 24" row also on Marcel Piping / RPF India.
- 3/4", 1-1/4", 2-1/2" seen only in Metallect. 1" OD printed as 120.78 in both sources (probably 120.7 = 4-3/4") — check.
- Excel Metal gives 24" thickness ~41 mm (conflict; kept 57.2). Column order in sources was unlabeled and inferred as OD/PCD/bolts/bolt dia/thickness.
- Do not confuse with AS 2129 Table H (different standard).
Sources: metallectsteel.com/bs-10-flanges.html · marcelforged.com/flange-dimensions-standards/bs-10-flanges/b · rajtilakmetal.com/bs-10-flange.html · delvin.nz/wp-content/uploads/2023/12/Flange-table.pdf · marcelpiping.com/bs-10-flanges/ · rpfindia.com/bs-10-flanges.html · excelmetal.net/bs-10-table-h-flanges.html