... flange (SO), socket welding flange, lap joint flange (LJF), welding neck flange (WNF), blind flange, orifice flange, reducing flange, pad type flange, loose hubbed flange, welding plate flange, welding neck collar, welding-on collar, loose plate flange, companion flange ... B2203, KS B1503, JIS B2220, JIS B2216, ANSI 16.5, ANSI B16.36, ANSI B36.1O-ANSI B36.19, ASME B16.47 SER, B ...