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About product and suppliers:
        Alibaba.com offers 39,932 screw hex-head products. such as free samples, paid samples. 

There are 39,932 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 Mid East. 

You can ensure product safety by selecting from certified suppliers, including 20,878 with ISO9001, 3,777 with ISO14001, and 1,609 with Other certification.