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UDC 621.9
IS0
I NTERNATI O NAL ORGAN1 ZATl ON FOR STAN DARDI ZATl ON
IS0 RECOMMENDATION
R 236
HAND REAMERS AND
LONG FLUTED MACHINE REAMERS
MORSE TAPER SHANK
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.
---------------------- Page: 1 ----------------------
BRIEF HISTORY
The IS0 Recommendation R 236, Hand Reamers and Long Fluted Machine Reamers, Morse
was drawn up by Technical Committee ISO/TC 29, Small Tools, the Secretariat of
Taper Shank,
which is held by the Association Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1947, taking into account the
studies which had been made by the former International Federation of the National Standardizing
Associations (ISA), and led, in 1958, to the adoption of a Draft IS0 Recommendation.
In September 1959, this Draft IS0 Recommendation (No. 302) was submitted to all the IS0
Member Bodies for enquiry. It was approved, subject to some modifications, by the following
:
Member Bodies
Austria Hungary Portugal
Belgium India Romania
Burma Italy Sweden
Czechoslovakia Mexico Switzerland
France Netherlands United Kingdom
Germany Pakistan U. S. S. R
Greece Poland
One Member Body opposed the approval of the Draft: 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.
r'
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ISO/R 236 - 1961 (E)
~~~~ ~
IS0 Recommendation R 236 Decem ber 1961
HAND REAMERS AND
LONG FLUTED MACHINE REAMERS
MORSE TAPER SHANK
INTRODUCTION
I. SCOPE
This IS0 Recommendation relates to reamers and deals with the following two types :
1. Hand reamers. . . . . . . . . . . . . . . . . . . . . . . . Tables 1.1 to 1.3,
2. Long fluted machine reamers, Morse taper shank . . . . . . . . Tables 2.1 to 2.3.
Other types of reamers will be dealt with in further IS0 Recommendations as and when current
work on them is completed.
For each type of reamer mentioned above, this IS0 Recommendation comprises three tables,
giving respectively :
(1) the recommended dimensions in millimetres,
(2) the recommended dimensions in inches,
(3) the corresponding dimensions, in millimetres and in inches, set out as functions of dia-
meter steps.
II. INTERCHANGEABILITY
The numerical tables have been drawn up in such a way as to ensure that the standard dimensions
in millimetres and inches correspond as closely as possible.
To this end, the complete range of diameters has been subdivided into a number of steps, the
limits of which have been derived from the preferred number series for the metric values and
converted directly from those for the inch values; the lengths and taper shank dimensions remain
the same for the metric and the inch values within a given step.
The recommended diameters in the two systems of units of measurement differ, however, and
the number of recommended diameters, in a given step, also differs in one system from that in
the other.
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,a
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ISO/R 236 - 1961 (E)
1. HAND REAMERS
I '1
Y
I
1.1 Recommended dimensions in millimetres
d d
20
22
(1.5)
107 22
1.6- 21 44
1.25 1
-~ -
1.8- 23 47 1.40
-
4
2.0 25 50 1.60
25 115 20.00 24
~
2.2 27 54 1.80 I
2.5 29 58 2.00 I
~-
2.8
124 22.40 26
~ -_
31 62 ~
2.24
3.0 5
3.5 35
71 32 133
265 25.00 28
-__- -
4.0 38
76 ' 3.15 I
~
6
4.5 41
81 I 3.571 142 284 28.00
31
5.0 44
87 1 4.00 1
-~
5.5 7
-_
47 93 ~ 4.50
6.0
I ~ 152 305 31.50
34
~~__
7.0 54 107 5.60 1 8
____
8.0 58 115 1 6.30 9
~
______
9.0 62 154 7.10 10 45 163
326 35.50 38
- -- ____
66
10.0 133 8.00 11
- ____-
11.0 71 142
9.00 12
~ ~~ ________
12.0
174 347 40.00
42
76 152 ~ 10.00 ~ 13
(13.0 j
14.0-
81
163 ~ 11.20 I 14
(1 5.0> ~
-~
184 367 45.00
46
16.0
87
175 ~ 12.50 16
(17.0) I
-. ~ ~~
18.0
93
188 ~ 14.00 18
(19.0) 194
387 1 50.00 51
I
___ ~~~
20.0
67
1 O0 201 i 16.00 20
(21.0)
71 203 406 1 56.00
56
--
Sizes in brackets should be avoided wherever possible.
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1-
-1-
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ISO/R 236 - 1961 (E)
1.2 Recommended dimensions in inches
d
a i L
'I 4
(13/16:
0.098 0.709
3iIs
~~ ~ ~~~
7i8 ~~
0.124 1 0.787
-
O. 157
-
0.882
4'1, ~ 93~4
0.177
_______~ ~~~
I--
0.197
~
0.984
1 3/32
0.220
~~ ~ ~~
0.248
~
1.102
0.280
~
0.315 1.240
0.354 1.398
(15/32)
0.394 1.575
3 ~6
'12
~_ ~
0.441
glls 1l3Il6
'Il6
.. ~
0292 2
5is
11
0.551
271,~
Ils
--
Sizes in brackets should be avoided wherever possible.
NOTES relating to Tables l$ and 1.2
1. Intermediate sizes
When intermediate sizes are specially required, reference should be made to the General
Table 1.3.1 for the appropriate lengths.
2. Cutting portion
Tolerance on diameter d measured immediately behind the lead : m6* (for reamers supplied
from stock).
For dimensions in inches, direct conversion into inches of the metric values of m6.
3. Shanks
Diameter equal to d, with tolerance f8*.
Driving squares in accordance with IS0 Recommendation R 237.
For dimensions in inches, direct conversion into inches of the metric values of f8.
4. Tolerance on length
See General Table 1.3.1.
* IS0 System of Limits and Fits.
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ISO/R 236 - 1961 (E)
1.3 Corresponding dimensions, in millimetres and in inches, set out as functions of diameter steps
1.3.1 General Table: Lengths
Diameter ranges d Lengths
over I incl. over I inci. Il 1 1
-
mm in mm
1.32 1 1.50 0.052 O 1 0.059 1 20 1 41
-- - - -
p-
1.50 1.70 0.059 1 1 p- 0.0669
44
-p-- _____
1.70 1 1.90 0.066 9 0.074 8
-- -~ _____-- -_____ - --
1.90 2.12 0.074 8 0.083 5 1 I2
--__
2.12 I 2.36 0.083 5 0.092 9 27 54
-- - - --
-- 2.36- 1 2.65 -- 0.092 9- 0.104 3- 29 58
2.65 1- 3.00 0.104 3 0.118 1 31- 1 62
- -__
__- --
3.00 3.35 0.118 0.1319 33
66
______- --p---~
-__
3.35 3.75 0.131 9 1 0.147 6
.. --_____-pp 35 1 71
3.75 4.25 0.147 6 0.167 3 38 76-
_______________~-- - -__________
4.25 1 4.75 0.167 3 0.187 O 41- 1 81
~_____-- - --
4.75 5.30 0.187 01 -0.208 7 44 87
p- ---
5.30 6.00 0.208 7-- 0.236 2 47 93
- _____p-- - --
- 6.00 6.70 0.236 2 0.263 50 I 2
_____ ----p
--
6.70 1 7.50 -_____ 0.263 8 - 0.295 -_____ 3- -54 1
7.50- 1- 8.50 -- 0.295 --_____~ 3 0.334 6- 58 I
8.50 I 9.50 0.334 6 I 0.374 O 62 1
-
-- --
11.80 13.20
0.519 7 76 152 3 16
-____ ~
I --
13.20 ~ 15.00 0.519 7 1
0.590 6 81 163
__
p- - -_____
15.00 -'17.00 - 0
...