China’s output of metal fasteners reached around 4.9 million tons in 2011. Zhejiang province was the leading fastener producer, totaling 1.83 million tons in 2011. Other substantial fastener producing provinces or regions were Hebei (954,191 tons), Jiangsu (624,983 tons), Shandong (317,699 tons) and Shanghai (316,905 tons). Source:chinafastener.info