Bolting Dimensions for API Flanges

10,000 lb. W.P.

Nominal Size InchesGasket API NumberNumber Of StudsStud Bolt Size Inches
1-13/16BX15183/4 X 5
2-1/16BX15283/4 X 5-1/4
2-9/16BX15387/8 X 6
3-1/16BX15481 X 6-3/4
4-1/16BX15581-1/8 X 8
5-1/8BX169121-1/8 X 8-3/4
7-1/16BX156121-1/2 X 11-1/4
9BX157161-1/2 X 13
11BX158161-3/4 X 15
13-5/8BX159201-7/8 X 17-1/4
16-3/4BX162241-7/8 X 17-1/2
18-3/4BX164242-1/4 X 22-1/2
21-1/4BX166242-1/4 X 24-1/2