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About product and suppliers:
        Alibaba.com offers 175,347 ring standard products. About 1% of these are valves, 1% are other rubber products, and 1% are pipe fittings. 

A wide variety of ring standard options are available to you, such as 20#, a53(a,b), and 16mn. You can also choose from structure pipe, fluid pipe, and oil pipe. As well as from api, astm, and gb. And whether ring standard is erw, hot rolled, or cold rolled. 

There are 175,347 ring standard suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of ring standard respectively. 

Ring standard products are most popular in North America, Western Europe, and Mid East. 

You can ensure product safety by selecting from certified suppliers, including 39,267 with ISO9001, 29,403 with Other, and 5,929 with ISO14001 certification.