... /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.Pressure Class : 150 ... , 2500* MSS SP44 : WELDING NECK FLANGE, BLIND FLANGE.Pressure Class :300, 400 , 600 , 900* API 6A : WELDING NECK FLANGE, THREAD FLANGE,BLIND FLANGE.Pressure : 2000Psi, 3000Psi, 5000Psi ...