... DIN, GB, BS, JIS, NF, AAR Investment Casting of Suspension Parts for Trailers 1.Quality system certificate: ISO 90002. Standard: AISI ... Machine, Polishing, Chrome, Zinc, Nickel Plating 11.These parts are used in machine assembly, valve &pump parts, auto &motorcycle ... , electrical, furniture, etc.12.Your drawings or samples are welcome for customized. Investment Casting of Suspension Parts for Trailers