ISO 722:1991 Preview

Rock drilling equipment -- Hollow drill steels in bar form, hexagonal and round

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).


General information

  • Current status : Published
    Publication date : 1991-01
  • Edition : 3
    Number of pages : 2
  • :
    ISO/TC 82
    Mining
  • 73.100.30
    Equipment for drilling and mine excavation
    77.140.60
    Steel bars and rods

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