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Bolting Dimensions for API Flanges
| Nominal Size Inches |
Gasket API Number |
Number Of Studs |
Stud Bolt Size Inches |
| 1-13/16 |
BX151 |
8 |
3/4 X 5 |
| 2-1/16 |
BX152 |
8 |
3/4 X 5-1/4 |
| 2-9/16 |
BX153 |
8 |
7/8 X 6 |
| 3-1/16 |
BX154 |
8 |
1 X 6-3/4 |
| 4-1/16 |
BX155 |
8 |
1-1/8 X 8 |
| 5-1/8 |
BX169 |
12 |
1-1/8 X 8-3/4 |
| 7-1/16 |
BX156 |
12 |
1-1/2 X 11-1/4 |
| 9 |
BX157 |
16 |
1-1/2 X 13 |
| 11 |
BX158 |
16 |
1-3/4 X 15 |
| 13-5/8 |
BX159 |
20 |
1-7/8 X 17-1/4 |
| 16-3/4 |
BX162 |
24 |
1-7/8 X 17-1/2 |
| 18-3/4 |
BX164 |
24 |
2-1/4 X 22-1/2 |
| 21-1/4 |
BX166 |
24 |
2-1/4 X 24-1/2 |
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