US PATENT SUBCLASS 411 / 220
.~.~.~.~ And includes a region plastically deformable into engagement with the axially outwardly facing portion

Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

190  DF  HAVING STRUCTURE TO RESTRICT ROTATION OF THREADED, MATING PIECES (E.G., NUT LOCK) {13}
204  DF  .~ Structure is coaxial, distinct member (e.g., washer, key, or nut portion) that restricts nut piece {7}
216  DF  .~.~ Member or portion includes an axially disposed key {1}
217  DF  .~.~.~ Key coacts with bolt by occupying an axially extending recess formed in the radially outward surface thereof {3}
220.~.~.~.~ And includes a region plastically deformable into engagement with the axially outwardly facing portion

DEFINITION

Classification: 411/220

And includes a region plastically deformable into engagement with the axially outwardly facing portion:

(under subclass 217) Device wherein at least that part of the member which is intended to engage the axially outwardly facing portion of the internally threaded element is bent or otherwise deformed beyond its elastic limit when moved into engagement with that portion.