Hardlock Industry

Hardlock Industry Co., Ltd. () is a Japanese manufacturer of industrial nuts. Its headquarter is in Higashiōsaka, Osaka Prefecture. It was founded in 1974.
Hardlock Industry was founded in 1974. It developed the "Hardlock Nut", which is a type of self-locking nut. Since the Hardlock Nut was adopted for fixing rails of Hanshin Electric Railway, it has been adopted by many companies and has increased its market share around the world.
Its products were used in the bobsleigh sled by the Japan national team in the 2010 Vancouver Olympics, and also in the Tokyo Sky Tree.