Abstract / scope
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).
ISO 722:1991Published
Rock drilling equipment — Hollow drill steels in bar form, hexagonal and round
Matériel de forage des roches — Barres creuses, hexagonales et rondes pour fleurets