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

ANSI 300-lb Flanges

Nominal Pipe SizeDiameter of StudsNo.
Of
Studs
Stud Bolt LengthRing
Joint Gasket No.
Raised FaceRing Joint
InchesInchesInchesInches
1/21/242-1/23R11
3/45/8433-1/4R13
15/843-1/43-1/4R16
1-1/45/843-1/43-3/4R18
1-1/23/443-1/24R20
25/883-1/24-1/4R23
2-1/23/4844-1/2R26
33/484-1/45R31
3-1/23/484-1/45R34
43/484-1/25-1/4R37
53/484-3/45-1/4R41
63/4124-3/45-3/4R45
87/8125-1/26-1/4R49
101166-1/47-1/4R53
121-1/8166-3/47-1/2R57
141-1/82077-3/4R61
161-1/4207-1/28-1/4R65
181-1/4247-3/48-1/2R69
201-1/4248-1/49-1/4R73
221-1/2248-3/49-3/4R81
241-1/2249-1/410-1/4R77