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Engineering ToolBox > Cast Iron Flanges - ASME/ANSI Class 25
ASME/ANSI B16.1 - 1998 - Cast Iron Pipe Flanges and Flanged Fittings - Class 25 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.
| Cast Iron Flanges - ASME/ANSI 25 lb | ||||
| Pipe Size | Outside Diameter | Number of Bolt Holes | Bolt Hole Diameter | Bolt Circle |
| 4 | 9 | 8 | 3/4 | 7-1/2 |
| 5 | 10 | 8 | 3/4 | 8-1/2 |
| 6 | 11 | 8 | 3/4 | 9-1/2 |
| 8 | 13-1/2 | 8 | 3/4 | 11-3/4 |
| 10 | 16 | 12 | 3/4 | 14-1/4 |
| 12 | 19 | 12 | 3/4 | 17 |
| 14 | 21 | 12 | 7/8 | 18-3/4 |
| 16 | 23-1/2 | 16 | 7/8 | 21-1/4 |
| 18 | 25 | 16 | 7/8 | 22-3/4 |
| 20 | 27-1/2 | 20 | 7/8 | 25 |
| 24 | 32 | 20 | 7/8 | 29-1/2 |
| 30 | 38-3/4 | 28 | 1 | 36 |
| 36 | 46 | 32 | 1 | 42-3/4 |
| 42 | 53 | 36 | 1-1/8 | 49-1/2 |
| 48 | 59-1/2 | 44 | 1-1/8 | 56 |
| 54 | 66-1/4 | 44 | 1-1/8 | 62-3/4 |
| 60 | 73 | 52 | 1-1/4 | 69-1/4 |
| 72 | 86-1/2 | 60 | 1-1/4 | 82-1/2 |
| 84 | 99-3/4 | 64 | 1-3/8 | 95-1/2 |
| 96 | 113-1/4 | 68 | 1-3/8 | 108-1/2 |