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Flange Dimensional Tolerances

OUTSIDE DIAMETERWhen O.D. is 24" or less+1/8", -1/16"
OUTSIDE DIAMETERWhen O.D. is over 24"+1/8", -1/8"
INSIDE DIAMETERWhen I.D. is 10" and Smaller+1/32",- 0"
INSIDE DIAMETERWhen I.D. is over 10”+1/16",- 0"
CONTACT FACE DIAMETER1/16" Raised Face And 1/4" Raised Face+1/64",- 1/64"
DRILLINGBolt Hole Diameter+1/32”, -1/32”
DRILLINGBolt Circle Diameter+ 1/16”, - 1/16"
DRILLINGBolt Hole Spacing+ 1/32”, - 1/32"
THICKNESSWhen nominal size is 18" and smaller+1/8", -0"
THICKNESSWhen nominal size is 20" and larger+3/16",- 0"