Bolting Dimensions for ANSI Flanges all sizes as per ANSI B16.5-1988

ANSI 150-lb Flanges

Nominal Pipe SizeDiameter of StudsNo.
Of
Studs
Stud Bolt LengthRing
Joint Gasket No.
Raised FaceRing Joint
InchesInchesInchesInches
1/21/242-1/4
3/41/242-1/2
11/242-1/23R15
1-1/41/242-3/43-1/4R17
1-1/21/242-3/43-1/4R19
25/843-1/43-3/4R22
2-1/25/843-1/24R25
35/843-1/24-1/4R29
3-1/25/883-1/24-1/4R33
45/883-1/24-1/4R36
53/483-3/44-1/2R40
63/4844-1/2R43
83/484-1/44-3/4R48
107/8124-3/45-1/4R52
127/8124-3/45-1/2R56
141125-1/46R59
161165-1/26R64
181-1/81666-1/2R68
201-1/8206-1/47R72
221-1/4206-1/27-1/4R80
241-1/42077-3/4R76