… hooks, rivets, cotters, cotter-pins, washers (including spring washers) and similar articles, of iron or steel. …
Explanatory notes
… screws (or screw nails) , and also those which are pointed provided that their heads are slotted. Drive screws have … Archimedian screws; worm mechanisms and threaded shafts for presses; valve and cock closing mechanisms, etc.) ( Chapter … or fix other objects and differ from the hook‑nails of the preceding heading only in that they are threaded. (C) RIVETS …