... or as Buyer's requestCertificateISO9001ApplicationSteam, air, gas and oil pipes or for many other fluidsO.D.1/8”-6” ... standard, American standard and DIN standard Kinds of screwed half coupling: bends, elbows ,tees, crosses, sockets, caps, backnuts, flanges, ... steel ,stainless steel ,alloy steel . Surface of screwed half coupling: cold galvanizing,hot galvanizing,and black Egdes: banded, beaded or ...