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ISO

ISO 722:1991

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

Standard Details

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

Status : Published
Standard Type: Main
Document No: ISO 722:1991
Document Year: 1991
Pages: 2
Edition: 3

Life Cycle

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Published
ISO 722:1991

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