ISO 722:1991
Rock drilling equipment — Hollow drill steels in bar form, hexagonal and round
Rock drilling equipment — Hollow drill steels in bar form, hexagonal and round
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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).
| Edition | 1991 |
|---|---|
| Published Date | 1991 |
| Published By | International Standardization Organisation |
| Page Count | 2 |