Weld Neck Dimensional Tolerances : ASME B16.5
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” |