1:Swivel Ring Flange 2:1/4" --- 72" 3:150#,300#--2500# 4: C/S ,S/S , Alloy Steel 5: ... Class : 150, 300, 400 , 600 , 900, 1500 , 2500* ASME/ANSI B16.47(SERIES A & B) : WELDING NECK FLANGE ... .Pressure Class : 300, 400 , 600 , 900, 1500 , 2500* ASTM/ANSI B16.48:( Figure-8 blanks)Pressure Class : 150 ... , 300, 400 , 600 , 900,1500, 2500* MSS SP44 : WELDING NECK FLANGE, BLIND FLANGE.Pressure Class : ...