What's the thickness tolerance of neck flange?
Technical specification for GB/T15530.8-1995 copper alloy and composite flangesDifferent standards require different tolerances. You can choose what standards you want
Specification for JB/T74-1994 pipe flangesSH3406-1996 steel pipe flanges for petrochemical industrySpecification for GB/T17241.7-1998 cast iron pipe flanges
For dimensional tolerances of HG flanges of the Americas system, see HG 20624-97For the HG flange size tolerances shown in Europe, see HG 20603-97Specification for pipe flanges for GB/T9124-2000 steel
