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Established in 1971, Ta Toong Wang Machinery Co., Ltd. has been specializing in various kinds of Piston Rings. The special purpose piston rings are mainly applicable to ship main engine or aux engine, industrial machinery, and hydraulic machinery. Our piston rings are widely used in maintaining, repairing and replacing many famous brand machines. In order to conform with the certain hardness and flexibility standard, the product material, high-class casting iron, is refined with special methods. Most of processing products have gone through special nitrogen treatment, which makes the surface hardness up to HV680. Only the passed products examined by QC department can be packaged and shipped. We are extremely confident in our product quality and we believe that our clients will be satisfied with our service. Besides the standard branded piston rings, custom manufacturing to meet clients specific requirement are warmly welcome.