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

ANSI 2500-lb Flanges

Nominal Pipe SizeDiameter of StudsNo.
Of
Studs
Stud Bolt LengthRing
Joint Gasket No.
Raised FaceRing Joint
InchesInchesInchesInches
1/23/444-3/44-3/4R13
3/43/444-3/45R16
17/845-1/45-1/2R18
1-1/41466R21
1-1/21-1/846-1/26-3/4R23
2186-3/47R26
2-1/21-1/887-3/48R28
31-1/488-1/29R32
41-1/289-3/410-1/4R38
51-3/4811-3/412-1/4R42
62813-1/214R47
82121515-1/2R51
102-1/2121920R55
122-3/4122122R60