Section 15 Base metals and articles of base metal 73 Articles of iron or steel 73 18 Screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers (including spring washers) and similar articles, of iron or steel 73 18 24 - - Cotters and cotter-pins Commodity Code Description 73 18 24 00 - - Cotters and cotter-pins