... Alloy Steel 5:Marking as Customer design. Carbon Steel Swivel Ring Flange Type Weld Neck,Slip-On,Blind,Socket Weld,Lap ... HUB BLIND FLANGE, SOCKET WELD FLANGE.LAPJOINT FLANGE, THREADED FLANGE. RING TYPE JOINT FLANGE.Pressure Class : 150, 300, 400 , 600 , ... :300, 400 , 600 , 900* API 6A : WELDING NECK FLANGE, THREAD FLANGE,BLIND FLANGE.Pressure : 2000Psi, 3000Psi, 5000Psi, 10000Psi, 15000Psi, 20000Psi ...