Stainless Steel Welding Neck Flange Standard: ANSI B16.5,DIN,JIS, ... /4"-30". Kinds Slip on flanges,welding neck flanges,blind flanges,plate flanges,socket welded flanges,threaded flanges,lap joint flanges etc.Pressure Rating Class150,300,600 ... .Standard ANSI B16.5,DIN,JIS,UNI,BS4504,EN1092-1Material Stainless SteelGrade 304,304L,316,316L,321,321H.Face Type FF ...