... are drilled (machined) with the wall thickness of the flange having the same dimensions of the matching pipe. The ... neck flanges, welding neck flanges are normally used for high-pressure, cold or hot temperature. We specialize these flanges ... DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673B.S : BS4504 , BS4504, BS1560, BS10 Stainless Steel Blind Flange,Slip on Flange, ...