... standard 50 kingpin,brake drum,brake shoe, cam shalf for semi-trailers. 2,2'' and3.5''kingpin 3,Assembly and welding We ... ,BPW standard.4,2'' and 3.5'' kingpin5,Assembly and welding 50 and 90 kingpin 1,Huangjing Machine manufacture Co.,LTD was ... . 2, We have automatic stamping machine,multi-stage stamping machine,Welding robot,advanced painting equipment,enable to new automatic assembly production ...