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About product and suppliers:
        Alibaba.com offers 27,524 union coupling products. About 53% of these are pipe fittings, 1% are shaft couplings, and 1% are other general mechanical components. 

A wide variety of union coupling options are available to you, such as stainless steel, iron. You can also choose from forged, casting. As well as from hexagon, square. And whether union coupling is female, male, or welding. 

There are 27,418 union coupling suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Pakistan, and India, which supply 99%, 1%, and 1% of union coupling respectively. 

Union coupling products are most popular in North America, Southern Europe, and Northern Europe. 

You can ensure product safety by selecting from certified suppliers, including 5,700 with ISO9001, 3,868 with Other, and 1,084 with ISO14001 certification.