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

ANSI 600-lb Flanges

Nominal Pipe SizeDiameter of StudsNo.
Of
Studs
Stud Bolt LengthRing
Joint Gasket No.
Raised FaceRing Joint
InchesInchesInchesInches
1/21/2433R11
3/45/843-1/43-1/4R13
15/843-1/23-1/2R16
1-1/45/843-3/43-3/4R18
1-1/23/444-1/44-1/4R20
25/884-1/44-1/2R23
2-1/23/4855-1/4R26
33/4855-1/4R31
3-1/27/885-1/25-1/2R34
47/885-3/46R37
5186-1/26-1/2R41
61126-3/47R45
81-1/8127-3/48R49
101-1/4168-1/28-3/4R53
121-1/4208-3/49R57
141-3/8209-1/49-1/2R61
161-1/2201010-1/4R65
181-5/82010-3/411R69
201-5/82411-1/211-3/4R73
221-3/4241212-1/2R81
241-7/8241313-1/2R77