MT/T 521-2006Standard drill rod for drilling in coal mine gallery (English PDF)

MT/T 521-2006 is the English-translated version of 煤矿坑道钻探用常规钻杆.

MT/T 521-2006 is the Chinese industry standard "Standard drill rod for drilling in coal mine gallery". It was issued on August 19, 2006 by the National Mine Safety Administration, and took effect on December 1, 2006. It is obsolete: it has been replaced by MT/T 521-2025.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.

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