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IS0
O R G A N I Z AT I O N FOR STA N DARD I ZAT I O N
I N T E R N AT I O N A L
IS0 RECOMMENDATION
R 201
ROLLING BEARINGS
RADIAL INTERNAL CLEARANCE
IN UNLOADED RADIAL GROOVE TYPE BALL BEARINGS
WITH CYLINDRICAL BORE
VALUES
1 st E D IT1 ON
June 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 201, Rolling Bearings. Radial Internal Clearance in Unloaded
Radial Groove Type Ball Bearings with Cylindrical Bore-Values, was drawn up by Technical
Committee ISO/TC 4, Ball and Roller Bearings, the Secretariat of which is held by the Sveri-
ges Standardiseringskommission (SIS).
Technical Committee ISO/TC 4 discussed the questions dealt with by this IS0 Recommenda-
tion at the following meetings :
fourth meeting, held in Madrid, in May 1955,
fifth meeting, held in Vienna, in September 1956.
At the third meeting of the Technical Committee, Working Group No. 4 was appointed to
assist the ISO/TC 4 Secretariat in preparatory work and in drawing up proposals regarding toler-
ances. The Working Group, composed of the following Member Bodies : France, Germany,
Italy, Sweden, United Kingdom and U.S.A., held the following meetings:
first meeting, in Madrid, in May 1955,
second meeting, in Vienna, in September 1956.
On 11 July 1958, the Draft IS0 Recommendation (No. 156-Chapter 4) was distributed to
all the IS0 Members and was approved, subject to some modifications, by the following Member
Bodies :
Australia India Spain
Austria Italy Sweden
Brazil Japan Switzerland
Burma Netherlands United Kingdom
Canada Poland U.S.A.
France Portugal U.S.S.R.
Germany Romania Yugoslavia
Hung a r y
One Member Body opposed the approval of the Draft: Czechoslovakia.
The Draft IS0 Recom
...