Carbon Steel Flange: Size:1/2"-60" Type:WN SO Blind Plate SW Standard: ANSI B16.5 BS4504 ... DIN2576 2632 2633 Carbon Steel Flange:Size:1/2"-60" Type:WN SO Blind Plate SW Standard: ANSI B16.5 BS4504 ... neck flange (WNF), blind flange, orifice flange, reducing flange, pad type flange, loose hubbed flange, welding plate flange, welding neck collar ...