Commodity2005200620072008200920102011
Coach screws of iron/steel$145,122$577,977$276,127$122,330$384,918$288,013$426,350
Wood screws other than coach screws, of iron/steel$260,461$213,722$55,666$127,666$69,573$102,552$108,040
Screw hooks & screw rings, of iron/steel$11,351$35 $527$6,905$1,734 
Self-tapping screws of iron/steel$700,289$506,836$457,909$625,994$278,824$304,371$210,978
Screws & bolts (excl. of 7318.11-7318.14), whether or not with their nuts/w ...$1,991,215$2,451,065$2,714,373$4,323,989$3,186,643$4,621,186$10,901,185
Nuts of iron/steel$447,950$721,587$551,726$1,273,475$1,213,491$1,315,064$1,678,773
Threaded arts. of iron/steel (excl. of 73.07, 7318.11-7318.16)$23,704$37,157$213,837$277,215$150,458$175,788$405,598
Spring washers & oth. lock washers, of iron/steel$21,108$118,710$114,084$133,646$121,712$221,823$310,786
Washers (excl. of 7318.21) of iron/steel$51,527$165,841$204,159$142,826$270,691$216,550$430,986
Rivets of iron/steel$5,857$3,577$6,021$22,724$32,544$105,170$60,856
Cotters & cotter-pins, of iron/steel$223,178$247,951$359,381$409,310$572,027$589,887$748,854
Non-threaded arts. sim. to rivets, cotters and the like, of iron/steel (exc ...$66,600$141,611$184,177$264,717$51,010$146,977$129,591
Total$3,948,362$5,186,069$5,137,460$7,724,419$6,338,796$8,089,115$15,411,997