Bolting Dimensions for API Flanges

2000 lb. W.P.

Nominal Size InchesGasket API NumberNumber Of StudsStud Bolt Size Inches
2-1/16R2385/8 X 4-1/2
2-9/16R2683/4 X 5
3-1/8R3183/4 X 5-1/4
4-1/16R3787/8 X 6
5-1/8R4181 X 6-3/4
7-1/16R45121 X 7
9R49121-1/8 X 8
11R53161-1/4 X 8-3/4
13-5/8R57201-1/4 X 9
16-3/4R65201-1/2 X 10-1/4
21-1/4R73241-5/8 X 11-3/4
26-3/4BX167201-3/4 X 13-3/4