... BS, JIS, NF, AAR Investment Casting of Suspension Parts for Trailers 1.Quality system certificate: ... Casting, Die Casting, Lost Wax Casting, Precision Casting, Gravity Casting, CNC Machining 9. Material: Carbon Steel , Alloy Steel, Stainless Steel, Gray Iron, Ductile Iron, Aluminum, ect . 10 ... These parts are used in machine assembly, valve &pump parts, auto &motorcycle parts, train & railway parts, ...