| 411 / | HD | EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER |
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| 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} |
| 246 | DF | .~.~ By thread-gripping locking element {5} |
| 250 | DF | .~.~.~ Wire structure {1} |
| 251 |  | .~.~.~.~ Helically coiled wire {1} |
| 252 | DF | .~.~.~.~.~> Including a free end in nonrotational engagement with the threaded element |