Fastener

A fastener comprising a body with a thread formed thereon, said body having an end face, a cage rotatably mounted on said body and having a radial face directed toward said end face and sidewalls extending toward and overlying a portion of said body, to inhibit axial separation, said opposed faces being generally perpendicular to said body and abutting over substantially the entire radial extent thereof from an inner periphery to an outer periphery, said opposed faces having complementary cam surfaces formed thereon to induce relative movement upon rotation between said faces, said cage having a surface oppositely directed to said radial face and having a plurality of relatively fine asymmetric serrations formed thereon and extending substantially continuously across said surface, each of said serrations having an inclined facet and a generally axial end face and being oppositely directed to said cam surface, wherein the area over which each of said opposed surfaces abut is no greater than 50% of the area of said oppositely directed surface.

13-38. (canceled)