... : ISO 9001:2008 4.Surface: black, g screwed half coupling Black BS1387 Standard Carbon Steel Screwed Half Coupling screwed half couplingMaterialCarbon steel, Stainless steel, Alloy and Malleable ironStandardANSI ... We can supply many kinds of screwed half coupling, British standard, American standard and DIN standard Kinds of screwed half coupling: bends, elbows ,tees, crosses, sockets ...