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