January 1934 San-es Shokai founded by Tadao Yoshida in Higashi Nihonbashi, Tokyo; production and marketing of fastening products begins.
February 1938 San-es Shokai renamed Yoshida Kogyosho.
February 1942 Yoshida Kogyosho reorganized as a limited company.
May 1945 Komatsugawa Plant burned down and dissolved for a time.
August 1945 Yoshida Kogyosho purchased Uozu Tekkousho K.K. and renamed Yoshida Kogyo K.K.
January 1946 YKK® registered as a trademark of Yoshida Kogyo K.K.
March 1951 Yoshida Kogyo K.K. relocates its headquarters to Nihonbashi Bakuro-cho, Chuo-ku, Tokyo.
May 1955 Kurobe Plant commences operations in Kurobe City, Toyama Prefecture.
August 1958 Headquarters relocated to Asakusa Kaminarimon, Taito-ku, Tokyo.
November 1959 Yoshida Kogyo K.K. establishes its first overseas affiliate and begins production and marketing of fastening products in New Zealand.
November 1961 Yoshida Kogyo K.K. begins production and marketing of aluminum building products.
June 1963 Yoshida Kogyo K.K. relocates headquarters to its current location, Kanda Izumi-cho, Chiyoda-ku, Tokyo.
April 1972 Shikoku Plant begins operations in Utazu-cho, Ayauta-gun, Kagawa Prefecture.
June 1974 Tohoku Plant begins operations in Sanbongi-cho, Shida-gun, Miyagi Prefecture.
February 1975 Kyushu Plant begins operations in Yatsushiro City, Kumamoto Prefecture.
December 1981 Yoshida Kogyo K.K. introduces a new hook and loop fastener, Quicklon® (also called Cosmolon®).
May 1984 Yoshida Kogyo K.K. celebrates its 50th anniversary.
December 1984 Yoshida Kogyo K.K. launches real estate operations in Singapore.
January 1985 Yoshida Kogyo K.K. launches agricultural operations in Brazil.
September 1986 Yoshida Kogyo K.K. establishes its first overseas integrated plant in Indonesia; begins production of aluminum building products in Indonesia.
August 1994 Yoshida Kogyo K.K. renamed YKK Corporation.
September 1994 YKK Group establishes its Environmental Charter.
January 1996 Policy Planning Committee toward China formed.
September 1998 YKK opens its Global Business Center in Shinjuku, Tokyo.
July 2000 YKK establishes YKK Newmax Co., Ltd. as a principal company for its snaps and button business operations.
December 2002 YKK establishes its first machinery and engineering business company, the Suzhou YKK Machinery & Die Works Co., Ltd., 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. founded as the shared services center for YKK Group.
October 2003 YKK integrated its Architectural Products Manufacturing Group into YKK AP Inc. and begins the architectural products business of YKK Group as a complete organization.