... , API, DIN, JIS, HG, GB, JG Specifications 1)welding neck , slip - on ,socket welding , blind. 2)ASTM A105,DIN ST37.2,ASTM A182 ... , JG, BS.7)All the flanges are according to the ASTM, BS, DIN, JIS, EN, GB and customer's request. socket welding stainless flanges