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Ref. No.: lSO/R721 -1968(E)
IS0
I N T ERN AT I O NA L O RG A N I ZAT I O N FOR STA ND AR D IZ AT I O N
IS0 RECOMMENDATION
R 721
ROCK DRILLING
INTEGRAL STEMS
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 721, Rock drilling-Integral stems, 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. 800) 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
Czechoslovakia
Poland U. S. S. R.
France Portugal Yugoslavia
Germany South Africa,
Hungary Rep. of
India Spain
No Member Body opposed the approval of the Draft.
by correspondence to the
The Draft IS0 Recommendation was then submitted
IS0 Council, which decided, in May 1968, to accept it as an IS0 RECOMMENDATION.
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IS0 / R 721 - 1968 (E)
IS0 Recommendation R 721 May 1968
ROCK DRILLING
INTEGRAL STEMS
1. INTEGRAL STEMS in (19 mm) HEXAGON WITH FORGED COLLARED SHANK
TABLE I
D mm (in)
+ 0.3 mm (+ 0.012 in)
IL min.
- 0.1 mm (- 0.004 in)
* Supplementary stems.
Crosses (X) within thick-lined frames indicate series of preferred combinations of bit gauge (D)
and length (L). Small size crosses indicate further standardized series.
IS0 Recommendation R 722, Rock drilling-Hollow
Hollow hexagonal drill steel in bar form, see
Shank and chuck bushing, see IS0 Recommendation R 723,
hexagonal drill steels in bar form.
Rock drilling-Forged collared shanks and chuck bushings for hollow h
...