Patent ID: 8137040

Claim:
A lock nut comprising: a nut body having a plurality of partially circumferential grooves each extending along a same circumference, from a seat surface of the lock nut to a circumferential edge of a threaded hole, wherein each of a plurality of projections is disposed between two of the plurality of grooves and is made from the same material as that of the nut body and comprises: an arcuate outer side face above the seat surface, from an intersection of the seat surface and an outer circumference corresponding to each of the plurality of partially circumferential grooves and toward a center of the nut body, and an inner side face being an extension of an inner face of said threaded hole, and a base portion extending radially along the groove from the outer circumferential radius to the threaded hole, wherein a depth of said grooves is configured such that when said nut body is threadably engaged with a bolt and fastened against a head of the bolt, each of the plurality of projections is crushed and does not enter a space between a seat surface the head of the bolt and the seat surface of the nut body.