January 1934 San-S Shokai founded by Tadao Yoshida in Nihonbashi, Tokyo; the production and sale of fastening products begins.
February 1938 San-S Shokai renamed Yoshida Kogyosho.
February 1942 Yoshida Kogyosho reorganized as a limited company.
March 1945 Komatsugawa Plant burned down in the Great Tokyo Air Raids; Yoshida Kogyosho temporarily dissolved.
August 1945 Uozu Tekkousho K.K. purchased by Yoshida Kogyosho. Renamed Yoshida Kogyo K.K.
January 1946 YKK® registered as a trademark of Yoshida Kogyo K.K.
March 1951 Headquarters relocated to Nihonbashi Bakurocho, Chuo-ku, Tokyo.
May 1955 Kurobe Plant commences operations in Kurobe, Toyama Prefecture.
July 1957 Yoshida Shoji Co., Ltd. (current YKK AP Inc.) established.
August 1958 Yoshida Kogyo K.K. headquarters relocated to Asakusa Kaminarimon, Taito-ku, Tokyo.
July 1959 Exported fastener manufacturing plant to India.
November 1959 Operations related to aluminum building materials begun.
December 1959 Established the first local subsidiary in New Zealand.
June 1963 Headquarters relocated to current location (Kanda Izumi-cho, Chiyoda-ku, Tokyo).
May 1976 YKK Industries (Singapore) Pte. Ltd. established as the first overseas affiliate of YKK's architectural products business.
August 1994 Yoshida Kogyo K.K. renamed YKK Corporation.
September 1994 YKK Group Environmental Charter (Group Environmental Charter) established.
July 2000 YKK Newmax Co., Ltd. (current YKK Snap Fasteners Japan Co., Ltd.) established as the principal company of YKK's snaps and buttons business.
December 2002 First machinery and engineering business company (Suzhou YKK Machinery & Die Works Co., Ltd.) established in Suzhou, China.
February 2003 YKK Fastening Products Sales Inc. established as a sales company for YKK's fastening business.
April 2003 YKK Business Support Inc. established as the shared services center for the YKK Group.
October 2003 YKK's Architectural Products Manufacturing Group integrated into YKK AP Inc.; the architectural products business of the YKK Group begins as a fully integrated organization.
July 2006 YKK Tours launched by the YKK Group as an industrial tourism plant tour.
September 2008 YKK Center Park, a facility that is open to the general public, opened.
June 2015 The YKK80 Building completed in Chiyoda-ku, Tokyo, as the new headquarters of YKK Corporation and YKK AP Inc.
July 2018 YKK Corporation and YKK Fastening Products Sales Inc. merged.