mild steel couplings 1.Size: 1/8''-6'' 2.Standard: BS ANSI DIN standard 3.Certificate: ISO 9001:2008 4.Surface: black, g mild steel couplingsBS DIN ANSI Standard Carbon Steel Mild Steel Couplings screwed half couplingMaterialCarbon steel, Stainless steel, Alloy and Malleable ironStandardANSI B1.20.1, ASTM A733/ A53 /A106, ST37-2EN10241, BS1387, ISO7-1,DIN2999, DIN2986SpecificationFull socket, ...