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About product and suppliers:
        Alibaba.com offers 4,644 20mm square bar products. About 7% of these are stainless steel bars, 2% are flat steel, and 1% are square steel. 

A wide variety of 20mm square bar options are available to you, such as astm, aisi, and jis. You can also choose from bv, iso, and sgs. As well as from square, round, and flat. And whether 20mm square bar is valve steels, or mold steel. 

There are 4,644 20mm square bar suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of 20mm square bar respectively. 

0mm square bar products are most popular in North America, Domestic Market, and South America. 

You can ensure product safety by selecting from certified suppliers, including 899 with ISO9001, 755 with Other, and 153 with ISO14001 certification.