On August 2nd, 2010, the Ministry of Economic Affairs of Mexico once announced that iron steel nuts imported from China did cause material injury to Mexican fastener industry and made a 64% definitive antidumping duty on nuts imported from China (within HS codes 7318.16.03 and 7318.16.04) as well. Then in Nov. 4th, 2010, it revised the announcement to include only certain nuts under the following specifications: carbon steel grade 1008-1045, hardness 2/5/8/2H, hex or square, inner dia.≦ 1.5 in., threaded, flat surface on upper/down sides, with or without metal coatings. –
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http://www.fastener-world.com.tw/new/news_detail.php?id=4338