... : black, g mild steel couplingsBS DIN ANSI Standard Carbon Steel Mild Steel Couplings screwed ... customer’s requestThicknessSCH10 SCH20 SCH40 SCH80 SCH160; CLASS A, CLASS B, CLASS CSurfaceHot Dipped Galvanized, Electro Galvanized, Natural ... finished, Chemical blackThreadsDIN, BS, NPT, Metric, BSPT, BSP, NPS (ISO7/1, DIN 2999, ANSI ...