Riken Corp. engages in the manufacture and sale of engine and vehicular components. It operates through the Automotive and Machinery Parts, and Others segments. 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 plumbing equipment business, Electromagnetic Compatibility (EMC) business, and thermal engineering business, The company was founded by Masatoshi Okochi in November 1927 and is headquartered in Tokyo, Japan.