‘A’ Style vs ‘B’ Style
‘A’ Style Fitting
Male
Female
‘B’ Style Fitting
Male
Female
150# Flange
16-bolt
20-bolt
4-bolt
4"-8" 8-bolt
10"-14" 12-bolt
1"-3"
16"-18"
20"-24"
Nominal Pipe Size
Flange OD
OD of Raised Face
Diameter of Bolt Circle
Number of Bolts
Diameter of Bolt Holes
Diameter of Bolts
Thickness
1 1-1/4 1-1/2 2 2-1/2
4.25 4.62
9/16 5/8 11/16
2 2-1/2 2-7/8 3-5/8 4-1/8 5 6-3/16 7-5/16 8-1/2 10-5/8 12-3/4 15
3-18 3-1/2 3-7/8 4-3/4 5-1/2 6 7-1/2 8-1/2 9-1/2
4 4 4 4 4 4 8 8 8 8
1 1-1/4 1-1/2 2 2-1/2
1/2 1/2 1/2 5/8 5/8 5/8 5/8 3/4 3/4 3/4 7/8 7/8
5 6 7 7.5 9
3/4 7/8
3 4 5 6 8
15/16 15/16 15/16 1 1-1/8 13/16 1-1/14
3 4 5 6 8
10 11 13.5
11-3/4 14-1/4 17
10 12
16 19
12 12
10 12
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