STAINLESS STEEL FLANGE
DIMENSIONAL TOLERANCES

 

Welding Neck Flanges
Outside Diameter* When
OD is 24” or less
±1/16”
When OD is over 24” ± 1/8”
Inside Diameter 10” and smaller ±1/32”
12” through 18” +
1/16”
20”
and larger
+1/8”,
-1/16”
Diameter of Contact Face 1/16” Raised Face ±1/32”
1/4” Raised Face Tongue and Groove or Male and Female ±1/64”
Diameter of Hub at Point of Welding 5” and smaller +3/32”, -1/32”
6” and larger +5/32”, -1/32”
Welding Bevel Standards see drawings on Page 78
Diameter of Hub at Base* When Hub Base is 24” or less ±1/16”
When Hub Base is over 24” ±1/8”
Drilling* Bolt
Circle
±1/16”
Bolt hole spacing +1/32”
Eccentricity of Bolt Circle and Facing (with respect to
bore)
1/32” max
Length Thru Hub 10” and smaller ±1/16”
12” and larger ±1/8”
Thickness 18” and
smaller
+1/8”, -0”
20” and larger +3/16”, -0”
Where allowance has been left on face for finish. All
sizes*
+1/8”,
-1/16”

In accordance with ANSIB16.5

*Tolerance for these dimensions not covered by ANSIB16.5