Riken Corp. engages in the manufacture and sale of engine and vehicular components. It operates through the following segments: Automotive and Machinery Parts, and Others. The Automotive and Machinery Parts segment deals with the company's core products such as piston rings, camshafts, seal rings for transmissions, high-grade cast iron products, and valve lifters. The Others segment includes piping components, radio frequency anechoic chambers, and thermal engineering products such as heating wires and industrial furnaces. The company was founded by Masatoshi Okochi in November 1927 and is headquartered in Tokyo, Japan.