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 | 2-1/4 | – | – |
| 3/4 | 1/2 | 4 | 2-1/2 | – | – |
| 1 | 1/2 | 4 | 2-1/2 | 3 | R15 |
| 1-1/4 | 1/2 | 4 | 2-3/4 | 3-1/4 | R17 |
| 1-1/2 | 1/2 | 4 | 2-3/4 | 3-1/4 | R19 |
| 2 | 5/8 | 4 | 3-1/4 | 3-3/4 | R22 |
| 2-1/2 | 5/8 | 4 | 3-1/2 | 4 | R25 |
| 3 | 5/8 | 4 | 3-1/2 | 4-1/4 | R29 |
| 3-1/2 | 5/8 | 8 | 3-1/2 | 4-1/4 | R33 |
| 4 | 5/8 | 8 | 3-1/2 | 4-1/4 | R36 |
| 5 | 3/4 | 8 | 3-3/4 | 4-1/2 | R40 |
| 6 | 3/4 | 8 | 4 | 4-1/2 | R43 |
| 8 | 3/4 | 8 | 4-1/4 | 4-3/4 | R48 |
| 10 | 7/8 | 12 | 4-3/4 | 5-1/4 | R52 |
| 12 | 7/8 | 12 | 4-3/4 | 5-1/2 | R56 |
| 14 | 1 | 12 | 5-1/4 | 6 | R59 |
| 16 | 1 | 16 | 5-1/2 | 6 | R64 |
| 18 | 1-1/8 | 16 | 6 | 6-1/2 | R68 |
| 20 | 1-1/8 | 20 | 6-1/4 | 7 | R72 |
| 22 | 1-1/4 | 20 | 6-1/2 | 7-1/4 | R80 |
| 24 | 1-1/4 | 20 | 7 | 7-3/4 | R76 |
