| 411 / | HD | EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER |
| 439 | DF | IMPACT DRIVEN FASTENER, E.G., NAIL, SPIKE, TACK, ETC. {13} |
| 446 | DF | .~ Including integral locking means {3} |
| 451.1 | DD | .~.~ Comprising protrusion or recess on shank {7} |
| 451.5 | | .~.~.~ Shoulder-type protrusion |