API 6A Spec Flange Bolt & Ring Chart
6BX
2 1/16"
2 9/16"
3 1/8"
4 1/16"
5 1/8"
7 1/16"
9"
11"
13 5/8"
16 3/4"
21 1/4"
26 3/4"
R-23 RX-23
R-26 RX-26
R-31 RX-31
R-37 RX-37
R-41 RX-41
R-45 RX-45
R-49 RX-49
R-53 RX-53
R-57 RX-57
R-65 RX-65
R-73 RX-73
BX-167
API
Pressure
Rating
Flange
Size &
Bore
Ring Gasket
2 1/16"
2 9/16"
3 1/8"
4 1/16"
5 1/8"
7 1/16"
9"
11"
13 5/8"
16 3/4"
18 3/4"
21 1/4"
R-24 RX-24
R-27 RX-27
R-35 RX-35
R-39 RX-39
R-44 RX-44
R-46 RX-46
R-50 RX-50
R-54 RX-54
BX-160
BX-162
BX-163
BX-165
2000 lb
5000 lb
6BX
API
Pressure
Rating
Ring Gasket
1 13/16"
2 1/16"
2 9/16"
3 1/16"
4 1/16"
5 1/8"
7 1/16"
9"
11"
13 5/8"
18 3/4"
BX-151
BX-152
BX-153
BX-154
BX-155
BX-169
BX-156
BX-157
BX-158
BX-159
BX-164
8
8
8
8
8
12
12
16
20
20
24
20
5/8"
3/4"
3/4"
7/8"
1"
1"
1 1/8"
1 1/4"
1 1/4"
1 1/2"
1 5/8"
1 3/4"
4 3/4"
5 1/4"
5 1/2"
6 1/4"
7 1/4"
7 1/2"
8 1/2"
9 1/4"
9 1/2"
10 3/4"
12 1/2"
14 1/4"
Number Stud Dimensions
of Studs Diameter
Length
8
8
8
8
8
12
12
12
16
16
20
24
7/8"
1"
1 1/8"
1 1/4"
1 1/2"
1 3/8"
1 5/8"
1 7/8"
1 5/8"
1 7/8"
2"
2"
6 1/4"
7"
7 3/4"
8 1/2"
10 3/4"
11 1/4"
12 1/2"
14 1/2"
12 3/4"
14 3/4"
17 1/2"
18 3/4"
Number Stud Dimensions
of Studs Diameter
Length
8
8
8
8
8
12
16
16
20
20
20
7/8"
7/8"
1"
1 1/8"
1 3/8"
1 1/2"
1 1/2"
1 7/8"
2"
2 1/4"
3"
5 3/4"
6 1/4"
7"
8"
9 1/2"
11 1/2"
13"
15 3/4"
19 1/2"
21"
26 3/4"
Flange
Size &
Bore
Ring Gasket
6BX
2 1/16"
2 9/16"
3 1/8"
4 1/16"
5 1/8"
7 1/16"
9"
11"
13 5/8"
16 3/4"
20 3/4"
26 3/4"
R-24 RX-24
R-27 RX-27
R-31 RX-31
R-37 RX-37
R-41 RX-41
R-45 RX-45
R-49 RX-49
R-53 RX-53
R-57 RX-57
R-66 RX-66
R-74 RX-74
BX-168
API
Pressure
Rating
Flange
Size &
Bore
Ring Gasket
6BX
1 13/16"
2 1/16"
2 9/16"
3 1/16"
4 1/16"
5 1/8"
7 1/16"
9"
11"
13 5/8"
16 3/4"
18 3/4"
21 1/4"
BX-151
BX-152
BX-153
BX-154
BX-155
BX-169
BX-156
BX-157
BX-158
BX-159
BX-162
BX-164
BX-166
API
Pressure
Rating
Flange
Size &
Bore
Ring Gasket
1 13/16"
2 1/16"
2 9/16"
3 1/16"
4 1/16"
7 1/16"
9"
11"
13 5/8"
BX-151
BX-152
BX-153
BX-154
BX-155
BX-156
BX-157
BX-158
BX-159
API
Pressure
Rating
20000 lb
15000 lb
6BX
Flange
Size &
Bore
Number Stud Dimensions
of Studs Diameter
Length
10000 lb
Ring Gasket
3000 lb
Flange
Size &
Bore
API
Pressure
Rating
6BX
Number Stud Dimensions
of Studs Diameter
Length
8
8
8
8
8
12
12
16
20
20
20
24
7/8"
1
7/8"
1 1/8"
1 1/4"
1 1/8"
1 3/8"
1 3/8"
1 3/8"
1 5/8"
2"
2"
6"
7"
6 1/4"
7 1/2"
8 1/4"
8 1/2"
9 1/2"
10"
10 3/4"
12 1/4"
15"
17 1/2"
Number Stud Dimensions
of Studs Diameter
Length
8
8
8
8
8
12
12
16
16
20
24
24
24
3/4"
3/4"
7/8"
1"
1 1/8"
1 1/8"
1 1/2"
1 1/2"
1 3/4"
1 7/8"
1 7/8"
2 1/4"
2 1/2"
5 1/4"
5 1/2"
6 1/4"
7 1/4"
8 1/4"
9"
11 3/4"
13 1/4"
15 1/2"
17 3/4"
17 3/4"
22 1/2"
24 1/2"
Number Stud Dimensions
of Studs Diameter
Length
8
8
8
8
8
16
16
16
20
1"
1 1/8"
1 1/4"
1 3/8"
1 3/4"
2"
2 1/2"
2 3/4"
3
7 3/4"
8 1/2"
9 1/2"
10 1/4"
12 1/4"
17 3/4"
21 3/4"
23 3/4"
30"