Bolting Dimensions for ANSI Flanges all sizes as per ANSI B16.5-1988
ANSI 900-lb Flanges
| Nominal Pipe Size | Diameter of Studs | No. Of Studs |
Stud Bolt Length | Ring Joint Gasket No. |
|
|---|---|---|---|---|---|
| Raised Face | Ring Joint | ||||
| Inches | Inches | Inches | Inches | ||
| 1/2 | 3/4 | 4 | 4 | 4-1/4 | R12 |
| 3/4 | 3/4 | 4 | 4-1/4 | 4-1/2 | R14 |
| 1 | 7/8 | 4 | 4-3/4 | 5 | R16 |
| 1-1/4 | 7/8 | 4 | 5 | 5 | R18 |
| 1-1/2 | 1 | 4 | 5-1/4 | 5-1/2 | R20 |
| 2 | 7/8 | 8 | 5-1/2 | 5-3/4 | R24 |
| 2-1/2 | 1 | 8 | 6-1/4 | 6-1/4 | R27 |
| 3 | 7/8 | 8 | 5-1/2 | 5-3/4 | R31 |
| 4 | 1-1/8 | 8 | 6-1/2 | 6-3/4 | R37 |
| 5 | 1-1/4 | 8 | 7-1/2 | 7-1/2 | R41 |
| 6 | 1-1/8 | 12 | 7-1/2 | 7-3/4 | R45 |
| 8 | 1-3/8 | 12 | 8-1/2 | 8-3/4 | R49 |
| 10 | 1-3/8 | 16 | 9 | 9-1/4 | R53 |
| 12 | 1-3/8 | 20 | 9-3/4 | 10 | R57 |
| 14 | 1-1/2 | 20 | 10-1/2 | 11 | R62 |
| 16 | 1-5/8 | 20 | 11 | 11-1/2 | R66 |
| 18 | 1-7/8 | 20 | 12-3/4 | 13-1/4 | R70 |
| 20 | 2 | 20 | 13-1/2 | 14-1/4 | R74 |
| 24 | 2-1/2 | 20 | 17 | 18 | R78 |
