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About product and suppliers:
        Alibaba.com offers 502 hex 18mm products. About 15% of these are screws, 14% are bolts, and 3% are nuts. 

A wide variety of hex 18mm options are available to you, such as stainless steel, carbon steel. You can also choose from reducing, round, and hexagonal. As well as from free samples, paid samples. 

There are 502 hex 18mm suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of hex 18mm respectively. 

Hex 18mm products are most popular in North America, Western Europe, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 181 with ISO9001, 23 with Other, and 19 with ISO/TS16949 certification.