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UDC 621.9
IS0
INTERNATIONAL ORGANIZATION FOR STAN DARDlZATl ON
IS0 RECOMMENDATION
R 298
LATHE CENTRES
SIZES FOR INTERCHANGEABILITY
1st EDITION
March 1963
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 298, Lathe Centres - Sizes for Interchangeability, was drawn
Machine Tools, the Secretariat of which is held by the
up by Technical Committee ISO/TC 39,
Association Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1950, taking into account the
studies which had been made by the former International Federation of the National Standard-
izing Associations (ISA), and led, in 1955, to the adoption of a Draft IS0 Recommendation.
In July 1960, this Draft IS0 Recommendation (No. 390) was circulated to all the IS0
Member Bodies for enquiry. It was approved by the following Member Bodies:
Argentina Hungary Portugal
Belgium India Romania
Chile Israel Spain
Colombia Italy Sweden
Czechoslovakia Japan Switzerland
Denmark Netherlands United Kingdom
France New Zealand U.S.A.
Germany Poland U.S.S.R.
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in March 1963, to accept it as an IS0 RECOMMENDATION.
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lSOlR 298 - 1963 (E)
IS0 Recommendation R 298 March 1963
LATHE CENTRES
SIZES FOR INTERCHANGEABILITY
1. SCOPE
This IS0 Recommendation deals principally with lathe centres. However, its scope should not
be regarded as restricted to lathes only, but may be extended to all the other machine tools with
centres of the same type.
The centre sizes given in the tables which follow are only those necessary for interchangeability;
details of design (e. g. for the extracting device), which do not directly affect interchangeability,
are not included.
2. SIZES
Sizes for interchangeability of the taper shank with the machine are in compliance with IS0
Recommendation R 296, Serf-Holding Tapers for Tool Shanks.
Table 1, page 6, gives sizes in millimetres for centres with No. O to 6 Morse or metric 5 per cent
taper shanks.
Table 2, page 7, gives sizes in inches for
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