Tanaka Seimitsu Kogyo Co., Ltd. manufactures and sells precision automobile and motorcycle parts, general-purpose components, and aluminum die-cast products primarily in Japan and internationally. The company produces engine parts such as rocker arms, valve spring retainers, and piston pins; transmission parts including synchronizer ring sets, synchronizer rings, synchronizer springs, and drum clutches; as well as high-cycle aluminum die-cast items fabricated using in-house molds. Founded on March 1, 1948 and headquartered at 328 Shimada, Fuchu-machi, Toyama City, Toyama Prefecture, Japan, it operates through segments encompassing parts manufacturing, solutions for commercialization acceleration, and mobility businesses including Honda automobile and motorcycle sales and maintenance services. Main customers include Honda Motor Co., Ltd., Yamaha Motor Co., Ltd., and Mazda Motor Corporation, among others. In recent developments, the company reported fiscal year 2025 net income of Y1.79 billion versus Y2.22 billion the prior year alongside revenue of Y40.47 billion, reflecting ongoing operational adjustments in the automotive sector; it maintains an equity buyback program, repurchasing 150,000 shares in 2023, and continues to emphasize high-precision manufacturing capabilities certified under ISO9001, JISQ9001, and JISQ9100 standards for automotive and aerospace applications.