Locking fastener

A lock nut comprising:

• a generally tubular nut body having a radially outer surface defining an outer periphery of selectible configuration, a generally cylindrical radially inner surface defining an inner diameter, and a height dimension defining an axial direction, said inner surface being threaded and configured for mating threaded engagement with an externally threaded shank of a screw-type fastener;
• a substantially annular locking neck portion extending axially from said nut body and having a radially outer surface defining a smaller cross-sectional dimension than said outer periphery of said nut body and a generally cylindrical radially inner surface substantially coaxial with said nut body radially inner surface and defining an inner diameter substantially identical to said inner diameter of said nut body;
• a substantially flat radially extending locking surface defined on said nut body between said outer surface of said nut body and said outer surface of said locking neck, and a plurality of raised locking ribs extending across at least a portion of said locking surface, each of said ribs being arranged at an acute angle angularly offset in a direction corresponding to the direction of rotation of a fastener for mating with the nut to attain advancement toward a clamped engagement, said acute angle being defined by the rib and a radial line extending across said locking surface and intersecting said rib;
• and each of said ribs being substantially rectangular in cross-section.