KOYO (Guangyang Seiko Co., Ltd.) was founded in 1921. It is a Japanese company engaged in research and development of comprehensive functional products, with 6557 employees. Koyoseiko is one of the four major bearing production groups in Japan. With world-class production and control equipment, koyoseiko has eight major production plants in Japan, including Tokyo, Nara, Yintian, Fengqiao, Takamatsu, Tokushima and
