1:Swivel Ring Flange 2:1/4" --- 72" 3:150#,300#-- ... Steel 5:Marking as Customer design. Carbon Steel Swivel Ring Flange Type Weld Neck,Slip-On,Blind,Socket Weld, ... HUB BLIND FLANGE, SOCKET WELD FLANGE.LAPJOINT FLANGE, THREADED FLANGE. RING TYPE JOINT FLANGE.Pressure Class : 150, 300, 400 , ... 600 , 900, 1500 , 2500* ASTM/ANSI B16.48:( Figure-8 blanks)Pressure Class : 150, 300, 400 , 600 , 900,1500, 2500* ...