US PATENT SUBCLASS 411 / 218
.~.~.~.~ And includes a portion adapted to extend into a transverse opening provided in the bolt

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}
218.~.~.~.~ And includes a portion adapted to extend into a transverse opening provided in the bolt

DEFINITION

Classification: 411/218

And includes a portion adapted to extend into a transverse opening provided in the bolt:

(under subclass 217) Device wherein the member includes a footlike portion extending at more or less a right angle to the remainder thereof for entering an opening formed into or through the externally threaded element at about 90< deg.
(1) Note. The footlike portion frequently performs a retaining function.