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IS0
FOR STAND AR D I Z AT I O N
IN TERN AT1 ON AL O R G A N I ZAT I O N
IS0 RECOMMENDATION
R 300
PART II
IS0 IDENTIFICATION CODE FOR ROLLING BEARINGS
GROUP IV: TAPERED ROLLER BEARINGS, INCH SERIES
1 st ED IT I ON
December 1965
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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 300/Part II, IS0 IdentiJication Code for Rolling Bearings.
Group IV. Tapered Roller Bearings, Inch Series, was drawn up by Technical Committee ISO/TC 4,
Rolling Bearings, the Secretariat of which is held by the Sveriges Standardiseringskommis-
sion (SIS).
Work on this question by the Technical Committee began in 1956 and led, in 1959, to the
adoption of a Draft IS0 Recommendation.
In June 1963, this Draft IS0 Recommendation (No. 416) was circulated to all the IS0 Mem-
ber Bodies for enquiry. It was approved by the following Member Bodies:
Australia Greece Romania
Austria Hungary Spain
Belgium India Sweden
Canada Italy Switzerland
Japan United Kingdom
Chile
Czechoslovakia Netherlands U.S.A.
France New Zealand Yugoslavia
Germany Poland
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 December 1965, to accept it as an IS0 RECOMMENDATION.
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IÇO/R 300/Part II - 1965 (E)
CONTENTS
Page
.............. 5
Introduction .
.......................... 6
1. Section 1 : Basic Number
................................. 6
1.1 Bore
................................. 6 i
1.2 Type
1.2.1 Bearing type symbols . 6
.......................... 6
1.3 Dimension series (line)
............................... 6
1.4 Example
7
2. Section 2: Modification of design .
2.1 Cage 7
.................................
8
2.2 Bearing ring modification .
2.2.1 Tapered bore . 8
2.2.2 Miscellaneous modifications . 8
9
3. Section 3: Internal fit and tolerances .
10
4. Section 4 : Lubricants and preservatives .
11
5. Section 5: Special requirements .
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IÇO/R 300/Pait II - 1965 (E)
6
IS0 Recommendation R 300/Part II December 1965
IS0 IDENTIFICATION CODE FOR ROLLING BEARINGS
GROUP IV: TAPERED ROLLER BEARINGS, INCH SERIES
INTRODUCTION
A bearing number in Group IV is divided into five sections, of which Section 1 constitutes the
Basic Number and should always be shown. Sections 2 to 5 constitute the Supplementary Number.
No symbol in Section 1 should be omitted.
When Sections 2 to 5 are not needed, no symbol is shown in any of these sections.
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When one or more intermediate sections are not needed, the cage symbol or the letter X is used
2, the figure O for Section 3 and the letter X for Section 4, to space the other sections
for Section
apart. Unused sections that otherwise would end a number are not shown.
TABLE 1. - Schematic arrangement of Group IV
Group IV : Tapered roller bearings, Inch Series
I Basic Number I Suplementary Number
Section 1 I Section 2 I Section 3 I Section 4 Section 5
Type and boundary Modification Internal fit
dimensions
I of design I and tolerances I Lubricants
I I
Special
and
require-
Dimension Bearing
preser-
ments
Bore I Type 1 series I Cage I ring 1 IntY' I Tolerances
vatives
(line) modification
O00
Section I (Basic Number) comprises symbols indicating bearing type and main boundary
dimensions: bore, outside diameter, inner ring width and bearing width, as shown
on page 6.
Section 2 (Modification of design) establishes suffix letters indicating cage type, tapered bore
and other modifications of regular design as shown on pages 7 and 8.
(Internal fit and tolerances) establishes suffix figures indicating data as shown on
Section3
page 9.
Section 4 (Lubricants and preservatives) establishes suffix letters to identify types of lubri-
cants and preservatives as shown on page 10.
Section 5 (Special requirements) establishes suffix figures for specification items as show on
page 11 and in Appendix 1 of IS0 Recommendation R 300/I, IS0 Identification
Code for Rolling Bearings.
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ISO/R 3ûO/Part II - 1965 (E)
1. SECTION 1: BASIC NUMBER
TABLE 2. - Schematic arrangement of Section 1
I Section 1: Basic Number I
Dimension
Bore Type series
(line)
1.1 Bore
The bearing bore is identified by code figures expressing the bore diameter in '/16 in units.
Example: 1 in bore is 16 x '/I6 in units, thus bore number is 16.
1.2 Type
Tapered roller bearing types, Inch Series, are identified by three letters, of which the first
two letters are KI, indicating that the bearing belongs to Group IV for inch series tapered
roller bearings. A third letter identifies the approximate contact angle of the bearing, as
shown in the type symbol table below.
1.2.1 Bearing type symbols
Tapered roiier bearings, Inch Series, single row
Symbol Description
KIA Contact angle a from above 7" to and including 10"
~
KIB Contact angle a from above 10" to and including 17"
...