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

Standard No.

ISO 722:1991

Release Date

1991

Published By

International Organization for Standardization (ISO)

Latest

ISO 722:1991

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 722:1991 history

• 1991 ISO 722:1991 Rock drilling equipment; hollow drill steels in bar form, hexagonal and round
• 1985 ISO 722:1985 Rock drilling — Hollow hexagonal drill-steels in bar form
• 1974 ISO 722:1974 Title missing - Legacy paper document