| 411 / | HD | EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER |
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| 378 | DF | EXTERNALLY THREADED FASTENER ELEMENT, E.G., BOLT, SCREW, ETC. {16} |
| 386 | DF | .~ Pilot end having means enhancing fastening or installation {1} |
| 387.1 |  | .~.~ Drill-tip-type end {5} |
| 387.2 | DD | .~.~.~> Having a reaming portion |
| 387.3 | DD | .~.~.~> Having enhanced gripping structure |
| 387.4 | DD | .~.~.~> Thread-tapping portion or with thread pitch stabilizing ridge |
| 387.5 | DD | .~.~.~> Having distinct, spaced cutting edges or points (e.g., prongs) |
| 387.6 | DD | .~.~.~> Resembling a twist-drill-type bit {2} |