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About product and suppliers:
        Alibaba.com offers 929 steel tube internal thread products. About 24% of these are steel pipes, 12% are stainless steel pipes. 

A wide variety of steel tube internal thread options are available to you, such as astm, jis, and aisi. You can also choose from iso, bv, and sgs. As well as from seamless, efw, and erw. And whether steel tube internal thread is 300 series, 400 series, or 200 series. 

There are 937 steel tube internal thread suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and India, which supply 99%, 1%, and 1% of steel tube internal thread respectively. 

Steel tube internal thread products are most popular in South America, North America, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 753 with ISO9001, 77 with Other, and 22 with ISO/TS16949 certification.