| 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} |
| 315 | DF | .~ With a member in the nature of a rotation preventing key movable laterally into engagement with the threaded elements {2} |
| 316 | DF | .~.~ And utilizing a resilient characteristic of the key, or of a discrete element {1} |
| 317 | DF | .~.~.~ With a discrete, resilient element {1} |
| 318 | | .~.~.~.~ Comprising a spring of the coiled type |