... stock 4.API, TUV...certificate welding neck flange, BS 32931.specificationStandards: ANSI(ASME), AWWA, DIN, EN1092, ... GOST, JIS, BS, UNI, SABSType: welding neck, slip on, bind, threaded ... BS4360GR.43A BS1503-164 GR.490 BS 1503-224 GR.410 BS 1503-304S11304S31 321S31 316S31 316S11 10 ... 161 GR.B AND C BS1633GR.B BS 1503-240GR.240 BS 1503-620 BS3604 11 ISO 7005- ...