… coach screws, screw hooks, rivets, cotters, cotter-pins, washers (including spring washers) and similar articles, of iron or steel. …
Explanatory notes
… coach screws, screw hooks, rivets, cotters, cotter‑pins, washers (including spring washers) and similar articles, of … are threaded (in the finished state) and are used to assemble or fasten goods so that they can readily be … or countersunk heads. They are used for the permanent assembly of metal parts (e.g., in large frameworks, ships …