Tokyo Koki Co. Ltd. engages in the manufacture and sale of various testing machines and measuring instruments in Japan. It operates through two segments, Construction Business, and Engineering Business. The company offers static tension, compression, bending, and fatigue tests for various materials; and structural testing machines, performance testing machines, and contract testing services. It also manufactures and sells locking nuts and springs, special springs, bolts, and other fastening equipment; provides engineering products; and contract testing, as well as maintenance and repair services for testing machines; and sale of construction materials. Tokyo Koki Co. Ltd. was founded in 1923 and is headquartered in Sagamihara, Japan.