Abstract: A self-locking nut has an annular body, an axial threaded bore, and a hexagonal exterior periphery. A small bore is drilled through the body parallel to the threaded bore adjacent to an apex of two peripheral flat surfaces. An L-shaped locking pin has a base leg received in that small bore, and an interference leg projecting into the threaded bore for interference relation with a mating bolt. The distal end of the base leg is provided with an outwardly facing recess, and this distal end is retained within the nut body by cold flowing body material into that small bore and recess. The recess includes two abuttment surfaces which are disposed in planes inclined away from a plane parallel to the base leg and perpendicular to a plane defined by the two pin legs. These abuttment surfaces coact with the nut metal displaced into the recess to allow for rotation of the distal end of the base leg through an arc less than that required for the interference leg.

Abstract: A self-locking nut has an annular body, an axial threaded bore, and a hexagonal exterior periphery. A small bore is drilled through the body parallel to the threaded bore adjacent to an apex of two peripheral flat surfaces. An L-shaped locking pin has a base leg received in that small bore, and an interference leg projecting into the threaded bore for interfering relation with a mating bolt. The distal end of the base leg is provided with an outwardly facing recess, and this end is secured relative to the nut body by cold flowing body material into engagement with the pin recess. The pin is fabricated from Type 308 stainless steel welding rod having a uniform circular cross section.