… Screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter-pins, …
Explanatory notes
… 73.18 ‑ Screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter‑pins, … called screws, used to transmit motion, or otherwise to act as an active part of a machine, (e.g., Archimedian screws; worm …