Flange Specifications (API-6A)
Flange Size | Working Pressure (psi) | Outside Diameter | Number of Bolt Holes | Diameter of Bolts | Length of Bolts | API Ring Gasket |
1-13/16″ | 10,000 | 7-3/8″ | 8 | 3/4″ | 5-1/4″ | BX-151 |
15,000 | 8-3/16″ | 8 | 7/8″ | 6″ | BX-151 | |
20,000 | 10-1/8″ | 8 | 1″ | 7-3/4″ | BX-151 | |
2-1/16″ | 2,000 | 6-1/2″ | 8 | 5/8″ | 5/8″ | R-23 |
3,000/5,000 | 8-1/2″ | 8 | 7/8″ | 7/8″ | R-24 | |
10,000 | 7-7/8″ | 8 | 3/4″ | 3/4″ | BX-152 | |
15,000 | 8-3/4″ | 8 | 7/8″ | 7/8″ | BX-152 | |
20,000 | 11-5/16″ | 8 | 1-1/8″ | 1-1/8″ | BX-152 | |
2-9/16″ | 2,000 | 7-1/2″ | 8 | 3/4″ | 5-1/4″ | R-26 |
3,000/5,000 | 9-5/8″ | 8 | 1″ | 7″ | R-27 | |
10,000 | 9-1/8″ | 8 | 7/8″ | 6-1/4″ | BX-153 | |
15,000 | 10″ | 8 | 1″ | 7″ | BX-153 | |
20,000 | 12-13/16″ | 8 | 1-1/4″ | 9-1/2″ | BX-153 | |
3-1/8″ | 2,000 | 8-1/4″ | 8 | 3/4″ | 5-1/2″ | R-31 |
3,000 | 9-1/2″ | 8 | 7/8″ | 6-1/4″ | R-31 | |
5,000 | 10-1/2″ | 8 | 1-1/8″ | 7-3/4″ | R-35 | |
3-1/16″ | 10,000 | 10-5/8″ | 8 | 1″ | 7-1/4″ | BX-154 |
15,000 | 11-5/16″ | 8 | 1-1/8″ | 8″ | BX-154 | |
20,000 | 14-1/16″ | 8 | 1-3/8″ | 10-3/4″ | BX-154 | |
4-1/16″ | 2,000 | 10-3/4″ | 8 | 7/8″ | 6-1/4″ | R-37 |
3,000 | 11-1/2″ | 8 | 1-1/8″ | 7-1/2″ | R-37 | |
5,000 | 12-1/4″ | 8 | 1-1/4″ | 8-1/2″ | R-39 | |
10,000 | 12-7/16″ | 8 | 1-1/8″ | 8-3/8″ | BX-155 | |
15,000 | 14-3/16″ | 8 | 1-3/8″ | 9-3/4″ | BX-155 | |
20,000 | 17-9/16″ | 8 | 1-3/4″ | 12-3/4″ | BX-155 | |
5-1/8″ | 5,000 | 14-3/4″ | 8 | 1-1/2″ | 10-3/4″ | R-44 |
7-1/16″ | 2,000 | 14″ | 12 | 1″ | 7-1/2″ | R-45 |
3,000 | 15″ | 12 | 1-1/8″ | 8-1/2″ | R-45 | |
5,000 | 15-1/2″ | 12 | 1-3/8″ | 11-1/4″ | R-46 | |
10,000 | 18-7/8″ | 12 | 1-1/2″ | 11-3/4″ | BX-156 | |
15,000 | 19-7/8″ | 16 | 1-1/2″ | 13″ | BX-156 | |
20,000 | 25-13/16″ | 16 | 2″ | 17-3/4″ | BX-156 | |
9″ | 2,000 | 16-1/2″ | 12 | 1-1/8″ | 8-1/2″ | R-49 |
3,000 | 18-1/2″ | 12 | 1-3/8″ | 9-1/2″ | R-49 | |
5,000 | 19″ | 12 | 1-5/8″ | 12-1/2″ | R-50 | |
10,000 | 21-3/4″ | 16 | 1-1/2″ | 13-1/4″ | BX-157 | |
15,000 | 25-1/2″ | 16 | 1-7/8″ | 16″ | BX-157 | |
11″ | 2,000 | 20″ | 16 | 1-1/4″ | 9-1/4″ | R-53 |
3,000 | 21-1/2″ | 16 | 1-3/8″ | 10″ | R-53 | |
5,000 | 23″ | 12 | 1-7/8″ | 14-1/4″ | R-54 | |
10,000 | 25-3/4″ | 16 | 1-3/4″ | 15-3/8″ | BX-158 | |
15,000 | 32″ | 20 | 2″ | 19-1/2″ | BX-158 | |
13-5/8″ | 2,000 | 22″ | 20 | 1-1/4″ | 9-1/2″ | R-57 |
3,000 | 24″ | 20 | 1-3/8″ | 10-3/4″ | R-57 | |
5,000 | 26-1/2″ | 16 | 1-5/8″ | 12-3/4″ | BX-160 | |
10,000 | 30-1/4″ | 20 | 1-7/8″ | 17-3/4″ | BX-159 | |
15,000 | 34-7/8″ | 20 | 2-1/4″ | 21″ | BX-159 | |
16-3/4″ | 2,000 | 27″ | 20 | 1-1/2″ | 10-3/4″ | R-65 |
3,000 | 27-3/4″ | 20 | 1-5/8″ | 12-1/4″ | R-66 | |
5,000 | 30-3/8″ | 16 | 1-7/8″ | 14-3/4″ | BX-162 | |
10,000 | 34-5/16″ | 24 | 1-7/8″ | 17-3/4″ | BX-162 | |
18-3/4″ | 5,000 | 35-5/8″ | 20 | 2″ | 18″ | BX-163 |
10,000 | 40-15/16″ | 24 | 2-1/4″ | 23″ | BX-164 | |
20-3/4″ | 3,000 | 33-3/4″ | 20 | 2″ | 15-1/4″ | R-74 |
21-1/4″ | 2,000 | 32″ | 24 | 1-5/8″ | 12-1/2″ | R-73 |
5,000 | 39″ | 24 | 2″ | 19″ | BX-165 | |
10,000 | 45″ | 24 | 2-1/2″ | 24-3/4″ | BX-166 | |
26-3/4″ | 2,000 | 41″ | 20″ | 1-3/4″ | 14-1/4″ | BX-167 |
3,000 | 43-3/8″ | 24″ | 2″ | 17-1/2″ | BX-168 |