Abstract: There is disclosed locknut construction comprising a nut of form and size similar to a usual nut which includes a nut body and locking section integral therewith, said section including segments extending angularly, radially, inwardly, which are of pre-determined length, whereby flattening of the segments when the nut is tightened on a mating threaded member and against a bearing surface from which such member extends, will cause said segments to enter between the crests of said threads, tending to deform the same, resulting in locking of the locknut body against undesirable reverse rotation and loosening thereby.

Abstract: There is disclosed a nut construction embodying an insert which provides for sealing and locking by damping vibration, the action of sealing being translated to locking by the formation of the insert.