ISO 239:1974

INTERNATIONAL STANDARD.
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXflYHAPOfiHU OPI-AHM3AUMX l-IO CTAHAAPTKSAUHM *ORGANISATION INTERNATIONALE DE NORMALISATION
Drill chuck tapers
C6nes d ’emmanchemen t pour mandrins de perceuses
First edition - 1974-12-01
Ref. No. ISO 239-1974 (E)
UDC 621-229.2
Descriptors : tools, drills, chucks, cones, dimensions.
Price based on 3 pages
FOREWORD
ISO (the International Organization for Standardization) is a worldwide federation
of national Standards institutes (ISO Member Bodies). The work of developing
International Standards is carried out through ISO Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up has the right to be represented on that Committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the ISO Council.
Prior to 1972, the results of the work of the Technical Committees were published
as ISO Recommendations; these documents are now in the process of being
transformed into International Standards. As part of this process, Technical
Committee ISO/TC 29 has reviewed ISO Recommendation R 239 and found it
technically suitable for transformation. International Standard ISO 239 therefore
replaces ISO Recommendation R 239-1961 to which it is technically identical.
ISO Recommendation R 239 was approved by the Member Bodies of the following
countries :
Austria India Romania
Belgium Italy Sweden
Switzerland
Czechoslovakia Mexico
France United Kingdom
Netherlands
Germany Pakistan U.S.A.
G reece Poland U.S.S. R.
Hungary Portugal
No Member Body expressed disapproval of the Recommendation.
No Member Body d isapproved the transformation of ISO/R 239 into an
I nte rnational Standard.
@ International Organkation for Standardkation, 1974 l
Printed in Switzerland
ISO 239-1974 (El
INTERNATIONAL STANDARD
Drill chuck tapers
1 SCOPE AND FIELD OF APPLICATION 2.1 Morse taper type
The tapered portions are identical with the following Morse
This International Standard lays down the dimensions of
tapers :
drill chuck tapers and includes two distinct types :
No. 1, for tapers BI0 and B12;
1) Morse taper type;
No. 2, for tapers BI 6 and B 18;
2) Jacobs taper type.
No. 3, for tapers B22 and B24.
It comprises, for each type of taper, two tables giving
The length of each of these tapers is, of course, distinctly
respectively the dimensions in millimetres and the
less than the Overall length of the corresponding Morse
corresponding dimensions in inches.
ta per; each taper may be regarded as corresponding
approximately either to that part of the Morse taper nearest
the small end (for example : BIO), or to the part nearest
the large end (for example : B12).
2.2 Jacobs tap
...