... -on flanges, Blind flanges, Lap joint flanges, Welding neck flanges, Spectacle flanges,TG flanges,Socket welding flanges and Threaded flanges,Square flanges.Pressure ... ,construction,etc.Tolerancenot less than +_8% of normal wall thickness.Mill ceitificate 3.1BContact WayTianjin ... DIN2673B.S : BS4504 , BS4504, BS1560, BS10Stainless Steel FlangesASTM A 182, ASTM A240 304, 304L, 304H, 309, 310, 310S, 316 ...