| 411 / | HD | EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER |
|
| 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 | DD | .~.~ Drill-tip-type end {5} |
| 387.6 |  | .~.~.~ Resembling a twist-drill-type bit {2} |
| 387.7 | DD | .~.~.~.~> Cuttings or chips moved along curved relief channel |
| 387.8 | DD | .~.~.~.~> And specified cutting edge, face, rake, relief surface, or flute angle (e.g., axially facing facets) |