... the wall thickness of the flange having the same dimensions of the matching pipe. The lighter the pipe is, the larger the bore, conversely, the heavier the pipe, the small the ... flanges in different dimensional and material specifications based upon the requirements of the clients.Stainless Steel : ASTM A 182, A ... BS4504 , BS4504, BS1560, BS10 Stainless Steel Blind Flange,Slip on Flange,ANSI B16.5