| 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} |
| 321 | DF | .~ With an elongated member in the nature of a rotation preventing key disposed axially of the threaded elements {2} |
| 322 | ![]() | .~.~ And utilizing a resilient characteristic of the key, or of a discrete element |