... casting, gravity casting, sand casting and the processing machinery . It is located in the industrial base, hometown of hardware, Yongkang, ... products are automobile fittings, motorcycle fittings, signal lamps and engine fittings. Different from our competitions, we are specialized ... A356 / AlSi12/A380/ADC12 2) Aluminum gravity casting is made by permanent mould, then machining and T6 heat treatment. ...