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UDC 621.822.61.8: 629.13: 003.62 Ref. No.: IÇO/R tOO/Pari 111 - 1968 (E)
IS0
I N T ER N AT I ON AL ORGAN IZATl O N FOR STAND A RD IZ AT ION
IS0 RECOMMENDATION
R 300
PART III
IS0 IDENTIFICATION CODE FOR ROLLING BEARINGS
GROUP V: AIRFRAME BEARINGS
1 st EDITION
January 1968
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 3ûû/Part III, IS0 Zdentijîcation Code for rolling bearings-
Groupe V: airframe bearings, was drawn up by Technical Committee ISO/TC 4, Rolling bearings,
the Secretariat of which is held by the Sveriges Standardiseringskomrnission (SIS).
Work on this question by the Technical Committee began in 1959 and led, in 1963, to the
adoption of a Draft IS0 Recommendation.
c
In April 1965, this Draft IS0 Recommendation (No. 642) 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:
Australia India Switzerland
Austria Italy Sweden
Canada Japan Turkey
Czechoslovakia Netherlands U.A.R.
France Poland United Kingdom
Romania U.S.A.
Germany
Hungary Spain Yugoslavia
One Member Body opposed the approval of the Draft:
U.S.S.R.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in January 1968, to accept it as an IS0 RECOMMENDATION.
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c ISO/R 3ûû/Part 111 - 1968 (E)
I SO Recommendation R 300/Part 111 January 1968
IS0 IDENTIFICATION CODE FOR ROLLING BEARINGS
GROUP V: AIRFRAME BEARINGS
INTRODUCTION
Purpose of the Code
This IS0 Identification Code for airframe rolling bearings has been developed to identify and,
as far as possible, describe each bearing on the basis of dimensional and functional interchange-
ability.
The Code provides a universal language for describing and identifying bearings for the purpose
of facilitating communications between the user and the manufacturer. It is also intended
to simplify handling by the user of identical bearings made by different manufacturers and
identified by different numbers, whose meaning may be difficult to interpret, since the various
designation systems used by manufacturers are not identical and generally differ from this Code.
The Code is not meant to give any intimation whatsoever of the availability of different types
of bearing. For such purpose the bearing manufacturers’ catalogues should be consulted.
Scope of the Code
This Code applies only to airframe rolling bearings of ball or roller designs made to metric and inch
dimensions in accordance with IS0 Recommendation R . . . *, Aicframe bearings- Dimensions.
Generally these bearings have limited application and are thereby limited in design variations as
compared to bearings coded by the IS0 Recommendation R 300/Part I, IS0 Zdentlfication
code for rolling bearings. It is important to take advantage of the limited variations, in order
to give the shortest possible code, thereby permitting the use of a fully descriptive code on the
bearings, should this be required. The Code makes no provisions for the numbering or iden-
tification of component parts of bearings or internal details of construction.
Structure of the Code
The structure of the Code is a system of alternate groups of figures and letters. The Code
identifies a ball or roller bearing by means of one group of figures indicating the bearing bore
diameter, followed by letters indicating the bearing type, a series number indicating the geome-
trical pattern and dimensions, followed by letters to indicate design modifications such as clear-
ances and metallurgical characteristics, etc., as shown in the Table below.
TABLE
I Section 1 I Section2 I
Basic number
Design
~ - ~~ ~__ - - ~~~ ~ -
variations
1 Series NO.
I
Plating
I Bore ~ Type
and
I
,
I ! 1 dimensions I clearance I
O ‘O ~
or IA or
or A
O0 ~ AA
I O0
* At present Draft IS0 Recommendation No. 474.
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