1:Swivel Ring Flange 2:1/4" --- 72" 3:150#,300#--2500# 4: ... , Alloy Steel 5:Marking as Customer design. Carbon Steel Swivel Ring Flange Type Weld Neck,Slip-On,Blind,Socket Weld,Lap ... , THREADED FLANGE. RING TYPE JOINT FLANGE.Pressure Class : 150, 300, 400 , 600 , 900, 1500 , 2500* ASME/ANSI B16.47(SERIES A & B ...