Kanzaki Kokyukoki

Kanzaki Kokyukoki Mfg. Co., Ltd. was established on 1 May 1947 in Amagasaki, Japan by Magokichi Yamaoka, the founder of Yanmar, and began producing gears and marine gears in 1948. The company is a member of the Yanmar Group; the hydraulic equipment, transmission and marine gear divisions were transferred from Yanmar in 2003, and the large YXH marine gear series was developed in 2010.

The head office and factory are at Inadera in Amagasaki, Hyogo Prefecture. The company profile lists 677 employees as of 31 March 2026, with ISO 9001 and ISO 14001 certification and approvals from classification bodies including ABS and Nippon Kaiji Kyokai.

Overseas bases are Tuff Torq Corporation in Tennessee, Transaxle Manufacturing of America Corporation in South Carolina and PT. YKT Gear Indonesia.