Koyo (Guangyang Seiko Corporation) was founded in 1921.

Is a developed integrated functional product manufacturing Japanese company with 6,557 employees.

sun This light Yang seiko co., LTD. KOYOSEIKO is one of the four major bearing production group, with the world's advanced production and control equipment, in Japan has Tokyo, nara, field, abundant bridge, Takamatsu, tokashima and turtle mountain eight main production factory, (all through ISO9001 certification), overseas across Europe, Asia, North and South America several production stronghold and research institutions.

Guangyang Seiko Corporation and Toyota Machinery Corporation merged on January 1,2006, with the combined new company named JTEKT Corporation (Corporation).