... ANSI B16.5, ASA, API-605,etc..slip-on, welding neck, blind, threaded, lap-joint, etc.Class150,300,600,900 ... , 2576, 2632,2633, 2543, 2544, etcplate, slip-on, welding neck, blind, threaded etc.Class150,300,600,900,150041/2''-64 ... BS4504, PN16, PN25, PN40, etc.plate, slip-on, welding neck, blind, threaded etc.Class150,300,600,900,150051/2''-64 ... contact us. Carbon Steel Flange (Plate/Slip-On/Welding Neck)