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, wa 73 18 11 73 18 11 00 Commodity Code Description 73 18 11 00 00 -- Coach screws 73 18 12 00 00 -- Other wood screws 73 18 13 00 00 -- Screw hooks and screw rings 73 18 14 00 00 -- Self-tapping screws 73 18 15 00 00 -- Other screws and bolts, whether or not with their nuts or washers 73 18 16 00 00 -- Nuts 73 18 19 00 00 -- Other 73 18 21 00 00 -- Spring washers and other lock washers 73 18 22 00 00 -- Other washers 73 18 23 00 00 -- Rivets 73 18 24 00 00 -- Cotters and cotter-pins 73 18 29 00 00 -- Other