Fastener with attached lock ring

Claim 1

A one-piece insert having a body portion formed integral with a lock ring portion and interconnecting strip means formed therebetween, with said body portion being in continuous, cooperative engagement with said lock ring portion, and having a top surface, a threaded external surface adapted for securement in a tapped hole in a workpiece, and a serrated portion intermediate said top surface and said threaded external surface, said serrated portion having a straight cylindrical exterior surface extending axially the entire length thereof, and a plurality of angularly spaced, axially extending teeth projecting radially outward from said exterior surface and extending up to said strip means, said lock ring portion being integrally connected to said body portion top surface by said interconnecting strip means and having an external surface, a plurality of radial teeth projecting from said external cylindrical surface, a straight cylindrical inner wall, and a plurality of radial grooves on said inner wall, each of said grooves extending to said strip means and being of substantially equal length to and in continuous axial alignment with one of said teeth on said body serrated portion, said lock ring portion being axially displaceable at said interconnecting strip means with respect to, for meshing engagement with, said body portion and being formed from the same parent material as said body portion.