Shangzhong piston ring co,ltd ,was founded in 1994.Factory moved to Wuhu City in 2009,our company covers an area of 50000 square meter including construction area of 32000 square meter.we have employees more than 400(among them,technicians more than 40).We are specializing in producing brand of"shangzhong" piston ring which applied for varies foreign and domestic gas(diesel)cars,trucks,compressors,marine and engineering machinery.In recent years,we have introduced professional piston ring machines,there are inside &outside profile modeling lathe,high precision double-side grinder,automatic beveling machine ,opening trimming machine,digital contron lathe.the Geman-made (PSA-10K) trapiziod grinder,Japanese-made (R-4MG-1)moulding grinder,Swiss-made(M-1100C)plasma molybdenum equipment and so on..meanwhile .with the full efforts of whole staff,formed one line which produce starting fromraw material casting to finished products,oil ring automatic stamping machine and ...[More]line for steel ring.We also possess the productivity of heating surface treatment ,nitried phosphated,chrome plating ,tin plating and molybdenum coated.In ,we own special chemical lab and quality testing center.The quality of our products is guaranteed by ISO9002 quality system which have passed and the products we produce are according to TS16949 standard .Shangzhong enterprise always adheres to the business philosophy and corporate culture as "people-oriented,progressive,pursuit for superiority,credit forever".Now we have developed more than 6000 specifications for the vehicle in the world.Our annual output reach 40 million pieces.Our products have been exported to all over the world which have been very popular with customers.