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About product and suppliers:
        Alibaba.com offers 37,997 screw hex-head products. such as free samples, paid samples. 

There are 37,997 screw hex-head suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of screw hex-head respectively. 

Screw hex-head products are most popular in North America, Domestic Market, and South America. 

You can ensure product safety by selecting from certified suppliers, including 18,906 with ISO9001, 4,649 with ISO14001, and 2,450 with Other certification.