... GOST/DIN/JIS/BS etc Specifications1. ASME Flanges ANSI B16.9 2. Material:Carbon Steel Material: A105 A105N A106 Q235 ... Blind flanges, Lap joint flanges, Welding neck flanges, Spectacle flanges,TG flanges,Socket welding flanges and Threaded flanges,Square flanges.6 ... ,chemical,power,gas,water,linepipe, heat exchanger,shipbuilding,construction,etc.9. Tolerance:not less than +_8% of normal wall thickness ...