... , the small the bore. Our range weld neck flanges, welding neck flanges are normally used for high-pressure, cold or hot ... : 150#, 300#,400 #,600#,900#, 1500# & 2500 #.StandardANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655 ... DIN2673B.S : BS4504 , BS4504, BS1560, BS10 Stainless Steel Lap Joint Flanges (ANSI B16.5)