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UDC621.822.87 - 181
IS0
I NTERN AT1 ON A L O RG A N IZATl O N FOR STAN DARD IZATl ON
IS0 RECO M M EN DATIO N
R 355
PART IV
ROLLING BEARINGS
TAPERED ROLLER BEARINGS
BOUNDARY DIMENSIONS
SUB-UNITS
INCH SERIES
1st EDITION
September 1968
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of 1SO Recommendations and IS0 Standards
The copyright
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, beiiig
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 he obtdined through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 355, Part IV, Rolling bearings - Tapered roller bearings --
Boundary dimensions - Sub-units - Inch series, was drawn up by Technical Committee ISO/TC 4,
Rolling bearings, the Secretariat of which is held by the Sveriges Standardiseringskommission (SIS).
Work on this question by the Technical Committee began in 1962 and led, in 1963, to the
adoption of a Draft IS0 Recommendation.
In January 1965, this Draft IS0 Recommendation (No. 641) was circulated to all the 1SO
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature,
by the following Member Bodies :
Argentina Germany Poland
Australia
Hungary Romania
Brazil
India Sweden
Canada Israel
Switzerland
Czechoslovakia Italy
U.A.R.
Finland Japan United Kingdoin
France
Netherlands U.S.A.
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 September 1968, to accept it as an IS0 RECOMMENDATION.
-2-
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ISO/R 355/1V-1968 (E
IS0 Recommendation R 355 September 1968
ROLL1 NG BEAR I NGS
TAPERED ROLLER BEARINGS
BOUNDARY DIMENSIONS
PART IV
SU B-U N ITS
INCH SERIES
1. SCOPE
The sub-units of tapered roller bearings consist of outer ring (cup unit) and inner ring, roller and
cage assembly (cone unit). The boundary dimensions and tolerances of the complete bearings are
.
given in relevant IS0 Recommendations. In this IS0 Recommendation only the additional sub-
unit boundary dimensions are given with refercnce to the bearing bore diameter and dimension
series.
2. SYMBOLS AND ABBREVIATIONS
d = bearing bore diameter
01 = bearing angle of contact
de = srnail inside diameter of outer ring
C = outer ring width
The bearing line numbers refer to IS0 Recommendation R 355, Part I : Rolling bearings - Tapered
roller bearings - Boundary dimensions,
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ISO/R 355/1V-1968 (E)
Line 1
Dimen ms in inches
Bore
Bore
a
a C
C diameter
diameter
de
d
d
14'31' 2.91671 0.5937
0.625 18' O' 1 .O80 63 0.3125 2.250
0.6875
0.3437 2.500 15'48' 3.13965
0.750 19'21' 1.145 O3
3.594 75 0.7500
0.4375 2.750 17' 11'
0.875 13'58' 1.487 54
3.960 27 0.9375
15' O' 1.597 75 0.4062 3.000 10'17'
1 .O00
4.490 86 1 .O000
1.125 1 6'20' 1.736 38 0.4062 3.500 10' IO'
4.000 10' 10' 5.040 85 1.1250
1.250 15'22' 1.887 54 0.4650
0.5500 4.500 11' 5' 5.821 02 1.2500
1.375 14' 5' 2.093 5 1
5 .O00 11'30' 6.286 05 1.3175
1.500 15' O' 2.230 75 0.5538
2.425 05 0.5938 5.500 12'38' 6.883 69 1.3437
1.750 11'59'
13'20' 2.6
...