... Flanges are drilled (machined) with the wall thickness of the flange having the same dimensions of the matching pipe. The lighter ... & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22,C276 Copper Alloys : Copper, Brass & GunmetalSize : 1/8" NB TO 48"NB.Class ... , BS4504, BS1560, BS10 304/304L & 3016/316L ANSI B16.5 Flange