Catalogue

DIMENSIONAL TOLERANCES FOR A.N.S.I. FLANGES IN INCHES


THREADED, SLIP-ON, LAP JOINT AND BLIND FLANGES
WELDING NECK FLANGES
*OUTSIDE DIAMETER
When O.D.is 24" or less
± 1/16"
*OUTSIDE DIAMETER
When O.D.is 24" or less
± 1/16"
When O.D.is over 24"
± 1/8"
When O.D.is over 24"
± 1/8"
INSIDE DIAMETER
Threaded
To standard gauge Limitsi
INSIDE DIAMETER
Sizes 10" and smaller
± 1/32"
Slip on and Lap Joint Sizes 10" and smaller
± 1/32" – 0"
Sizes 12" trough 18"
± 1/16"
Sizes 12" and larger

± 1/16" - 0"
Sizes 20" and larger
+1/8"-1/16"
DIAMETER OF COUNTERBORE
Same as for inside Diameter
DIAMETER OF CONTACT FACE
1/16" Raised Face

± 1/32"

±1/64"

±1/64"
DIAMETER OF CONTACT FACE
1/16" Raised Face
± 1/32"
1/4" Raised Face
1/4" Raised Face Tongue and Groove, or Male and Female

+5/32 -1/8 "
Tongue and Groove, or Male and Female
*OUTSIDE DIAMETER OF HUB
Sizes 5" and smaller
+3/32" - 1/32"
DIAMETER OF HUB AT POINT
Sizes 5" and smaller
+3/32" - 1/32"
Sizes 6" and larger
±1/16"
Sizes 6" and larger
5/32"-1/32"
DRILLING
Bolt Circle0
±1/32"
*DIAMETER OF HUB AT BASE

When Hub Base is 24" or less
±1/16"
Bolt hole spacing
+1.6 -1.6
When Hub Base is over 24"
±1/8"
Eccentricity of Bolt Circle and Facing (with respect to bore)
Sizes 2.1/2" and smaller ± 1/32"
DRILLING
Bolt Circle
±1/16"
Eccentricity of Bolt Circle and Facing (with respect to bore)

Sizes 3" and larger ± 1/16"

 
Bolt hole spacing
±1/32"
Eccentricity of Bolt Circle and Facing (with respect to bore)
Sizes 2.1/2" and smaller ± 1/32"
Eccentricity of Bolt Circle and Facing (with respect to bore)
Sizes 3" and larger ± 1/16"
LENGTH THRU HUB
Sizes 18" and smaller
+1/8" -1/32"
LENGTH THRU HUB
Sizes 10" and smaller
±1/16"
Sizes 20" and larger
+3/16" -1/16"
Sizes 12" and larger
±1/8"
THICKNESS
Sizes 18" and smaller
+1/8"-0"
THICKNESS
Sizes 18" and smaller
+1/8"-0"
Sizes 20" and larger
+3/16"-0"
Sizes 20" and larger
+3/16"-0"