Section 15 Base metals and articles of base metal 73 Articles of iron or steel 73 18 Screws, bolts, nuts, coach-screws, screw hooks...(incl.spring washer)..of iron or steel 73 18 21 Spring washers and other lock washers 73 18 21 00 Spring washers and other lock washers Commodity Code Description 73 18 21 00 000 Spring washers and other lock washers
