... -On,Socket Weld,Lap Joint,Threaded, Orifice flange,Swivel flange 4.OEM Service Flange Size1/2"-72"TypeWeld Neck, Slip-On ... , Blind, Socket Weld, Lap Joint, Threaded, Orifice Flange, Swivel Flange, Spectacle Blind,Etc.StandardANSI, ASME ,MSS, API, DIN ... , 600 , 900* ASME/ANSI B16.36 : (ORIFICE FLANGES) WELDING NECK FLANGE, SLIPON FLANGE, THREADED FLANGE.Pressure Class :300, 400 , 600 , 900, 1500 ...