Abstract: A threaded fastener includes a nut forming a threaded center hole that defines a rotational axis. The threaded fastener also includes a plurality of spring plungers affixed to the nut, each having a shaft that is aligned parallel to the rotational axis. The threaded fastener also includes a positioner forming (i) an unthreaded center hole that is coaxial with the threaded center hole and (ii) a plurality of recesses facing the spring plungers. As the nut is torqued against the positioner on a threaded spindle, the spring plungers repeatedly engage and disengage the recesses as the nut rotates with respect to the positioner. The recesses are shaped such that positioner converts the applied torque into a linear force that compresses the spring plungers, thereby locking the threads of the nut against the threads of the spindle.

Abstract: A dual load path assembly includes an outer pin, which has an axial through bore and at least one end that includes a threaded section. The threaded section includes at least one slot orientated from the end and extends axially along at least part of the threaded section. The assembly also includes an inner pin, which is receivable in the through bore of the outer fastener. A female fastener comprising at least one notch is receivable on the threaded end of the outer pin. A locking plate comprises a through hole via which it is receivable on the shank of the inner pin and at least one projection. The locking plate is arranged such that the projection is receivable in both the notch and the slot. A locking member engages with the end of the inner pin and abuts a face of the locking plate thereby sandwiching the locking plate between the locking member and the female fastener.

Abstract: An economical alternative to throw away lock nuts is provided by a retainer that fits to or over a conventionally threaded nut. Splines on the shaft, and resilient fingers on the retainer, are mismatched in number by one, assuring that they interfit with at least one finger blocked by a spline, or closed to it, so that the nut cannot be turned significantly back. The retainer can be easily removed, so that both it and the nut may be reused.