... Swivel Flange, Spectacle Blind, etc. Size 1/2"-48" Class 150#, 300#, 400#, 600#, 900#, 1500#, 2500# Specification Carbon Steel ASTM A105 ... . LAPJOINT FLANGE, THREADED FLANGE. RING TYPE JOINT FLANGE. Pressure Class: 150, 300, 400, 600, 900, 1500, 2500 * ASME/ANSI B16.47( ... A & B): WELDING NECK FLANGE, BLIND FLANGE. Pressure Class: 75, 150, 300, 400, 600, 900 * ASME/ANSI B16.36: (ORIFICE FLANGES) WELDING ...