... Steel Sockets Coupling Hot-dipped galvanized or electrical galvanized and black, also Powder coating as customer's reque Carbon Steel ... Sockets Couplingsteel socket material : Seamless Steel , stainless steel , carbon steelsteel socket standard ... ANSI/ASME,DIN,ISO,JIS ,GB,AND EN etc.,steel socket Application:Petroleum, chemical, power, gas, metallurgy, shipbuilding ...