The present invention relates to bolt and nut loosening prevention assemblies for preventing a bolt and a nut adapted to fix a first member and a second member to each other from loosening, including: loosening prevention members fitted to the bolt and the nut coupled to the first member and the second member, respectively; caps detachably coupled to the loosening prevention members, respectively, to prevent the loosening prevention members from rotating; and dual washers fixedly coupled to the insides of the loosening prevention members, respectively, to prevent the bolt and the nut from loosening.

A lock nut system includes a nut having a retaining member which includes a slot therein and a protrusion configured to fit within a recess of a shaft. A keeper includes a section receivable within the slot of the retaining member so when the nut is threadably engaged to the shaft to a desired torque the nut the keeper is slideable within the slot of the retaining member to allow the lock nut to be locked into position on the shaft without further rotation or other adjustment of the nut.

A lock nut system includes a nut having a retaining member which includes locking teeth configured to engage with the lock nut teeth. The retaining member is rotatable in both a clockwise or counterclockwise direction a preselected distance to allow the locking teeth to mesh with the nut teeth so the lock nut can be locked into position on the shaft without further rotation or other adjustment of the nut.

A precision adjustable length rod end assembly is disclosed and provides a fastener for mechanical assemblies that eliminates the need for a separate secondary locking device. The device includes a connecting rod, an end connector or rod end, and a lock nut assembly. The end connector threadably engages the connecting rod. The lock nut assembly engages both the end connector and the connecting rod. The threaded engagement between the end connector and the connecting rod enables the rod-end assembly to be adjusted to a precise working length (e.g., as measured along the central longitudinal axis). The lock nut assembly maintains the precision-adjusted working length of the rod-end assembly even when the rod-end assembly is exposed to harsh operating conditions, such as exposure to extreme vibrations.

A lock nut system includes a nut having a retaining member which includes locking teeth configured to engage with the lock nut teeth. The retaining member is rotatable in both a clockwise or counterclockwise direction a preselected distance to allow the locking teeth to mesh with the nut teeth so the lock nut can be locked into position on the shaft without further rotation or other adjustment of the nut.

A spindle nut retainer is used with a spindle with a flat portion on its threaded end. The flat portion interrupts the threads on the threaded end. A washer with a mating flat portion is slidably mounted over the threaded end and a nut is removably threaded to the threaded end of the spindle against the washer to set the preload on bearings. The nut retainer overlays a plurality of the corners of the nut and engages the threaded portion of the spindle with tangs. A majority of the tangs are flexed or bent to remain in biased contact with the threads on the spindle. Some of the tangs are located over the flat portion and remain unbent. The tangs resist rotation of the nut by engagement with the flat portion where it meets the threads.

In one embodiment of this invention the washers have been provided with the bottom teeth, which sink into the wood surface during nut tightening thus immobilizing the washer, and a turnable upward flap which when bent upward and pressing against the nut facet is preventing its loosening. In another similar embodiment the washer is provided with turnable upward bracket which has a tip entering the screw top's socket or slit, thereby immobilizing the screw and preventing its loosening. As a replacement for cylindrical nuts, a number of types of elongated nuts with open C-like cross-sections which elastically compress with their threaded hole becoming misaligned with the screw thereby jamming it. Said misalignment prevents overtightening and contributes to prevention of loosening, while the elastic compression of this nut acts in a way similar to a spring lock-washer preventing loosening. Similar elongated nuts with open cross-section are provided wherein the threaded hole is on top and the bolt is passed through an unthreaded hole between left and right edges which move towards it and grip it at the end of tightening. Said grip prevents overtightening and loosening.

A lock nut system includes a nut having a retaining member which includes a keeper having locking teeth configured to engage with the lock nut teeth. The locking teeth are offset in either a clockwise or counterclockwise direction to allow the lock nut to be locked into position on the shaft without further rotation or other adjustment of the nut.

A lock nut system includes a nut having a retaining member which includes locking teeth configured to engage with the lock nut teeth. The retaining member is rotatable in both a clockwise or counterclockwise direction a preselected distance to allow the locking teeth to mesh with the nut teeth so the lock nut can be locked into position on the shaft without further rotation or other adjustment of the nut.

A spindle nut retainer is used with a spindle with a flat portion on its threaded end. The flat portion interrupts the threads on the threaded end. A washer with a mating flat portion is slidably mounted over the threaded end and a nut is removably threaded to the threaded end of the spindle against the washer to set the preload on bearings. The nut retainer overlays a plurality of the corners of the nut and engages the threaded portion of the spindle with tangs. A majority of the tangs are flexed or bent to remain in biased contact with the threads on the spindle. Some of the tangs are located over the flat portion and remain unbent. The tangs resist rotation of the nut by engagement with the flat portion where it meets the threads.