... , API, DIN, JIS, HG, GB, JG Specifications 1)welding neck , slip - on ,socket welding , blind. 2)ASTM A105,DIN ST37.2,ASTM ... 80" (DN15 to DN2000)5)Special designavailable as the requirements of customer6)Standard: ANSI B16.5, B16.47, MSS, SP-44 ... , BS, DIN, JIS, EN, GB and customer's request. socket welding stainless flanges