... , B16.47, MSS, SP-44, AWWA, API, DIN, JIS, HG, GB, JG Specifications 1)welding neck , slip - on ,socket welding , blind. 2 ... requirements of customer6)Standard: ANSI B16.5, B16.47, MSS, SP-44, AWWA, API, DIN, JIS, HG, GB, JG, BS.7 ... ASTM, BS, DIN, JIS, EN, GB and customer's request. socket welding stainless flanges