... , ST37-2EN10241, BS1387, ISO7-1,DIN2999, DIN2986SpecificationFull socket, Half socketSurfaceHot dipped galvanized,Cold galvanized, BlackSize1/8"--- ... standard, American standard and DIN standard Kinds of screwed half coupling: bends, elbows ,tees, crosses, sockets, caps, backnuts ... stainless steel ,alloy steel . Surface of screwed half coupling: cold galvanizing,hot galvanizing,and black Egdes: banded, ...