... ISO 9001:2008 4.Surface: black, g mild steel couplingsBS DIN ANSI Standard Carbon Steel Mild Steel Couplings screwed half couplingMaterialCarbon steel ... BS, NPT, Metric, BSPT, BSP, NPS (ISO7/1, DIN 2999, ANSI B1.20.1)DimensionBS EN10241, ASTM A733, DIN2982TypeFull length,half ... , unions, nipples, bushings, plugs and so on. Carried Standard: GB/3287:2000/ KSB1531/ ISO5922/ ISO49/ISO/1 Size of mild ...