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Ref. No.: IÇO/R 243 - 1961 (E)
IS0
I N T E R NAT1 O N AL O R GAN I ZATl O N
FOR STAN DARD IZATl O N
IS0 RECOMMENDATION
R 243
TURNING TOOLS WITH CARBIDE TIPS
METRIC SERIES
1st EDITION
December 1961
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 243, Turning Tools with Carbide Tips - Metric Series, was drawn
up by Technical Committee ISO/TC 29, Small Tools, the Secretariat of which is held by the Asso-
ciation Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1955 and led, in 1958, to the
adoption of a Draft IS0 Recommendation.
In September 1959, this Draft IS0 Recommendation (No. 309) 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 :
Belgium Hungary Poland
Burma India Portugal
Czechoslovakia Italy Romania
Mexico Sweden
France
Germany Netherlands United Kingdom
Greece Pakistan U. S. S. R.
Three Member Bodies opposed the approval of the Draft:
Austria, Switzerland, U. S. A.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in December 1961, to accept it as an IS0 RECOMMENDATION.
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ISO/R 243 - 1961 (E)
IS0 Recommendation R 243 Decem ber 1961
TURNING TOOLS WITH CARBIDE TIPS
METRIC SERIES
INTRODUCTION
I. SCOPE
This IS0 Recommendation relates to turning tools with carbide tips. For the present, it com-
prises two parts :
1. General
1.1 Definition of right-hand tool and left-hand tool *
1.2 Tool lengths
2. External tools.
Internal tools and various other matters, such as marking for example, may be the subjects of
future IS0 Recommendations.
As far as tool lengths and dimensions of external tools are concerned, this IS0 Recommendation
is valid for application in metric measure only; corresponding standardization in the inch system
is to be the subject of future study.
of measurement
The general definitions are applicable, however, whichever system of units of measurement is
employed.
The shank sections and tips are selected from those contained in the relevant IS0 Recommenda-
tions.**
II. SHANK SECTIONS
For the particular case of turning tools with carbide tips, only two types of sections are selected
from among the various types provided for in the IS0 Recommendation mentioned above: **
(a) the square section h = b,
h
(b) the rectangular section with a ratio of = 1.6 approximately.
b
The choice between these two sections for any given tool is in accordance with the table for
external tools. This choice is based on present-day techniques, but may be subject to revision in
the future on the basis of studies to be undertaken by various countries with a view to establishing
which type of section is best adapted to its purpose from a technical point of view.
* Although this definition is purely conventional in character, this IS0 Recommendation should be regarded as applicable
using the inch system of measurement, as well as in countries using the metric system of mea-
on this point in countries
surement, in order to avoid all risk of confusion.
** IS0 Recommendation R 241 - Shanks for turning andplaning tools. Sections and tolerances. and
IS0 Recommendation R 242 - Carbide tips for turning tools. Metric series.
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e
ISO/R 243 - 1961 (E)
III. TOOL LENGTHS
Only one range of overall lengths is specified, the length being a function of the height h of the
shank, whether of square or rectangular section.
These lengths, ranged approximately in the series of preferred numbers
R 40/2
...