7318: Screws, bolts, nuts, rivets, washers, etc, iron, stee

731811: Screws, coach, iron or steel 731812: Screws, wood, iron or steel, except coach screws 731813: Screw hooks and screw rings of iron or steel 731814: Screws, self-tapping, iron or steel 731815: Bolts/screws nes, with/without nut/washer, iron/steel 731816: Nuts, iron or steel 731819: Iron or steel threaded articles except screw, nut,bol 731821: Washers, spring or lock, iron or steel 731822: Washers, iron or steel, except spring/lock 731823: Rivets, iron or steel 731824: Cotters and cotter-pins, iron or steel 731829: Non-threaded articles of iron or steel, nes 7318: Screws, bolts, nuts, rivets, washers, etc, iron, stee