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ISO 722:1991
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Rock drilling equipment -- Hollow drill steels in bar form, hexagonal and round

This standard was last reviewed* in 2013.

*ISO standards are reviewed every five years.

Abstract

Specifies the dimensions for seven nominal sizes. This third edition cancels and replaces the second edition (1985), which has been technically revised (addition of round drill steels and extension of the range of sizes).

 

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