Special Truck Company, CNHTC (original named Qingdao Special Truck Manufacturing Factory) is one of wholly owned subsidiaries of China National Heavy Duty Truck Group Corporation Ltd. . It is the biggest base of heavy duty special trucks manufacturing, refit trucks researching, developing and manufacturing all over the country as well as vehicle export base enterprise certified by nation. Its products arrange from heavy duty dump trucks, construction vehicles, sanitation vehicles to components of vehicles. It has an ability of producing 8000 units special trucks and 20% of them are exported. It is appointed by China Air Force as an enterprise manufacturing aircraft tractors and missile handling vehicles. Its products Qingzhuan brand hydraulic cylinders are famous in refit truck industry and has become the preferential option assembly for export dump trucks. It passed ISO9001 quality control system certificate in 1996.