... Blind, Socket Weld, Lap Joint, Threaded, Orifice Flange, Swivel Flange, Spectacle Blind, etc. 2.Size ... Forged Steel Flanges: ASME/ANSI B16.5: WELDING NECK FLANGE, SLIP-ON FLANGE, BLIND FLANGE, HIGH HUB BLIND FLANGE, SOCKET WELD FLANGE. LAPJOINT FLANGE, THREADED FLANGE. RING TYPE JOINT FLANGE ... B16.36: (ORIFICE FLANGES) WELDING NECK FLANGE, SLIPON FLANGE, THREADED FLANGE. Pressure Class: 300, 400, 600, ...