... 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, 900 ... WELDING NECK FLANGE, BLIND FLANGE. Pressure Class: 300, 400, 600, 900 API 6A: WELDING NECK FLANGE, THREAD FLANGE, BLIND FLANGE. Pressure: ...