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FOR STA N D A R D IZ AT I O N
I N T ER N AT I O NA L O RG A N I7 AT I ON
I S O R E C O M M E N DATI O N
R 722
ROCK DRILLING
HOLLOW HEXAGONAL DRILL STEELS IN BAR FORM
1st EDITION
May 1968
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 722, Rock drilling - Hollow hexagonal drill steels in
bar form, was drawn up by Technical Committee ISO/TC 82, Mining, the Secretariat of
which is held by the Deutscher Normenausschuss (DNA).
Work on this question by the Technical Committee began in 1960 and led, in 1964,
to the adoption of a Draft IS0 Recommendation.
In April 1965, this Draft IS0 Recommendation (No. 801) was circulated to all the
IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of an
editorial nature, by the following Member Bodies :
Australia Japan Sweden
Belgium
Korea, Rep. of Turkey
Brazil Netherlands U.A.R.
Chile New Zealand United Kingdom
Czec
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