Bolting Dimensions for ANSI Flanges all sizes as per ANSI B16.5-1988
| 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 | 1/2 | 4 | 2-1/2 | 3 | R11 |
| 3/4 | 5/8 | 4 | 3 | 3-1/4 | R13 |
| 1 | 5/8 | 4 | 3-1/4 | 3-1/4 | R16 |
| 1-1/4 | 5/8 | 4 | 3-1/4 | 3-3/4 | R18 |
| 1-1/2 | 3/4 | 4 | 3-1/2 | 4 | R20 |
| 2 | 5/8 | 8 | 3-1/2 | 4-1/4 | R23 |
| 2-1/2 | 3/4 | 8 | 4 | 4-1/2 | R26 |
| 3 | 3/4 | 8 | 4-1/4 | 5 | R31 |
| 3-1/2 | 3/4 | 8 | 4-1/4 | 5 | R34 |
| 4 | 3/4 | 8 | 4-1/2 | 5-1/4 | R37 |
| 5 | 3/4 | 8 | 4-3/4 | 5-1/4 | R41 |
| 6 | 3/4 | 12 | 4-3/4 | 5-3/4 | R45 |
| 8 | 7/8 | 12 | 5-1/2 | 6-1/4 | R49 |
| 10 | 1 | 16 | 6-1/4 | 7-1/4 | R53 |
| 12 | 1-1/8 | 16 | 6-3/4 | 7-1/2 | R57 |
| 14 | 1-1/8 | 20 | 7 | 7-3/4 | R61 |
| 16 | 1-1/4 | 20 | 7-1/2 | 8-1/4 | R65 |
| 18 | 1-1/4 | 24 | 7-3/4 | 8-1/2 | R69 |
| 20 | 1-1/4 | 24 | 8-1/4 | 9-1/4 | R73 |
| 22 | 1-1/2 | 24 | 8-3/4 | 9-3/4 | R81 |
| 24 | 1-1/2 | 24 | 9-1/4 | 10-1/4 | R77 |
