... '' Pressure 150LB, 300LB, 600LB, 900LB, 1500LB, 2500LB Connection Butt Weld & Socket Weld & Thread FlangesOur Flanges are drilled (machined) with the wall thickness ... , the heavier the pipe, the small the bore. Our range weld neck flanges, welding neck flanges are normally used for high ... , DIN2638, DIN2673B.S : BS4504 , BS4504, BS1560, BS10 Stainless Steel Lap Joint Flanges (ANSI B16.5)