| 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 |  | .~.~ Comprising protrusion or recess on shank {7} |
| 452 | DF | .~.~.~> Longitudinal rib {1} |
| 455 | DF | .~.~.~> Circumferential rib |
| 456 | DF | .~.~.~> Barb or spur-type projection |
| 451.2 | DD | .~.~.~> Undulating type |
| 451.3 | DD | .~.~.~> Serrations or sharp teeth |
| 451.4 | DD | .~.~.~> Longitudinal flute, depression, or channel |
| 451.5 | DD | .~.~.~> Shoulder-type protrusion |