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| Commodity | 2005 | 2006 | 2007 |
| Roller chain of iron/steel | $2,292,075 | $3,279,060 | $4,336,245 |
| Articulated link chain other than roller chain, of iron/steel | $335,249 | $84,449 | $335,054 |
| Parts of articulated link chain of iron/steel | $385,513 | $267,708 | $505,990 |
| Skid chain of iron/steel | $155,607 | $1,790 | $2,410 |
| Stud-link chain of iron/steel | $29,820 | $125,869 | $213,106 |
| Welded link chain of iron/steel | $16,876 | $36,561 | $1,512 |
| Chain, of iron/steel, n.e.s. in 73.15 | $163,781 | $144,274 | $399,519 |
| Parts of chains (excl. articulated link chain), of iron/steel | $10,747 | $196,531 | $33,268 |
| Total | $3,389,668 | $4,136,242 | $5,827,104 |
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