... for trucks,semi-trailers. 2,produce10 tooth slack adjust arm other spare parts. 3,BPW standard. ... We can supply various camshafts,slack adjuster,fifth wheel and Kingpin for trucks, semi- ... semi-trailers.2,produce Brake drum,10 tooth slack adjust arm and other spare parts.3,BPW ... intensity, well stretch & bend intensity. 9. HJ key parts in the axle are processed by digital equipment, ...