... customer’s requestThicknessSCH10 SCH20 SCH40 SCH80 SCH160; CLASS A, CLASS B, CLASS CSurfaceHot Dipped Galvanized, Electro Galvanized, Natural finished ... , 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, ...