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ISO 722:1991
M00000693
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ISO 722:1991 Rock drilling equipment - Hollow drill steels in bar form, hexagonal and round
standard by International Organization for Standardization, 02/01/1991
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Full Description
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).