Abstract: A new locking T-nut for securely fastening a threaded element, such as a threaded bolt, to a structure. The inventive device includes a cylindrical nut body with a threaded bore extending therethough. Within the bore, at least one resilient locking ring is mounted within an annular groove provided on the inner surface of the bore. A radial flange radially extends from the one end of the nut body and includes at least one securing tooth extending therefrom towards the other end of the nut body.