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Ref. No. : ISO/R 297-1963/Add. 1-1971 (E)
IS0
O RG A N I2 AT1 ON FOR STA N D A R D I Z AT10 N
INTERN AT1 ON AL
ADDENDUM 1
TO
IS0
R E C O M M E N D AT I O N
R 297- 1963
7/24 TAPERS FOR TOOL SHANKS
7/24 TAPERS Nos. 45 AND 55
1st EDITION
March 1971
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 Addendum 1 to IS0 Recommendation R 297-1963 concerns standardization of 7/24 tapers Nos. 45
and 55. Study of this question was undertaken by Technical Committee ISO/TC 39,Machine tools, and led to the
adoption of Draft IS0 Recommendation No. 1962.
This Draft IS0 Recommendation was circulated to all the IS0 Member Bodies for enquiry in April 1970. It
was approved, subject to a few modifications of an editorial nature, by the following Member Bodies :
Ireland Spain
Belgium
Israel Sweden
Chile
Czechoslovakia Japan Switzerland
France Netherlands Thailand
Germany Poland U.A.R.
Greece Portugal United Kingdom
Hungary Rom ani a U.S.A.
India South Africa, Rep. of
No Member Body opposed the approval of the Draft.
This Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council, which decided
to accept it as ADDENDUM 1 to IS0 Recommendation R 297-1963.
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-3- ISO/R 297-1963/Add. 1-1971 (1
Addendum 1 to IS0 Recommendation R
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