... Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice Flange, Swivel Flange, Spectacle Blind, etc. 2.Size 1/2 ... : 75, 150, 300, 400, 600, 900 ASME/ANSI B16.36: (ORIFICE FLANGES) WELDING NECK FLANGE, SLIPON FLANGE, THREADED FLANGE. Pressure Class ...