Screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter-pins, washers (including spring washers) and similar articles, of iron or steel

731811 Iron or steel; threaded coach screws 731812 Iron or steel; threaded wood screws other than coach screws 731813 Iron or steel; threaded screw hooks and screw rings 731814 Iron or steel; threaded self-tapping screws 731815 Iron or steel; threaded screws and bolts n.e.c. in item no. 7318.1, whether or not with their nuts or washers 731816 Iron or steel; threaded nuts 731819 Iron or steel; threaded screws, bolts and nuts n.e.c. in item no. 7318.1 731821 Iron or steel; non-threaded spring washers and other lock washers 731822 Iron or steel; non-threaded washers, excluding spring and lock 731823 Iron or steel; non-threaded rivets 731824 Iron or steel; non-threaded cotters and cotter-pins 731829 Iron or steel; non-threaded articles, n.e.c. in item no. 7318.2