... Flanges are drilled (machined) with the wall thickness of the flange having the same dimensions of the matching pipe. The lighter ... #,400 #,600#,900#, 1500# & 2500 #.StandardANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48DIN : DIN2527, DIN2566, DIN2573, DIN2576 ... , DIN2673B.S : BS4504 , BS4504, BS1560, BS10 304/304L & 3016/316L ANSI B16.5 Flange