| 411 / | HD | EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER |
| 378 | DF | EXTERNALLY THREADED FASTENER ELEMENT, E.G., BOLT, SCREW, ETC. {16} |
| 411 | DF | .~ Thread or shank structure {7} |
| 417 | DF | .~.~ Circumferentially interrupted thread {2} |
| 418 | DF | .~.~.~ By longitudinal slot {2} |
| 420 | | .~.~.~.~ Inclined slot {1} |
| 421 | DF | .~.~.~.~.~> Helically oriented |