Japan Piston Ring Co., Ltd. is an important piston ring manufacturer in Japan. Main products: powertrain parts, valve mechanism parts and other products. In December 1934, Japan Piston Ring Co., Ltd. was established in Tamura-cho, Shiba-ku, Tokyo. Build the Kawaguchi factory.

Nihuan Auto Parts Manufacturing (Yizheng) Co., Ltd. (NAMY) is currently a wholly-owned enterprise established by Japan Piston Ring Co., Ltd. (NPR) on February 5, 2005 in Yangzhou (Yizheng) Automobile Industrial Park. Its project total The investment is US$29.7 million and the registered capital is US$14.9 million. The new company covers an area of ​​44,000 square meters and has a construction area of ​​17,000 square meters. It was officially completed and put into production in October 2005. NAMY is the first company invested by NPR in China to specialize in the production of steel piston rings. It uses NPR's advanced products, materials and manufacturing technology, integrates Chinese and Japanese management methods to specialize in the production of high-quality steel piston rings. The production of such piston rings includes various processing processes such as cold forming, cutting, grinding, heat treatment and surface treatment. As a strong partner of world-renowned automobile manufacturers, NAMY's quality is in line with the world's level and its trust is moving towards globalization. As the network in China continues to expand, NAMY will gradually support Japanese companies, well-known engine companies in China and other countries.