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IS0
I NT ERN AT I O N A L O RG A N I Z AT I O N FOR STA N DA RD I Z AT I O N
IS0 RECOMMENDATION
R 355
PART I
ROLLING BEARINGS
TAPERED ROLLER BEARINGS
BOUNDARY DIMENSIONS
1st EDITION
December 1963
COPYRIGHT RESERVED
IS0 Recommendations and IS0 Standards
The copyright of
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 355, Tapered Roller Bearings. Boundary Dimensions,
was drawn up by Technical Committee ISO/TC 4, Ball and Roller Bearings, the Secretariat
of which is held by the Sveriges Standardiseringskommission (SIS).
Work on this question by the Technical Committee began in 1949 and led to the
presentation of two Draft IS0 Recommendations, one concerning Metric Series and the
.
other Inch Series.
In November 1957, the Draft IS0 Recommendation concerning the Metric Series
(No. 154, chapters 2 and 3), was circulated to all the IS0 Member Bodies for enquiry. As
the results of this consultation were not considered satisfactory, the Technical Committee
presented a second Draft IS0 Recommendation, which was circulated to all the Member
Bodies in January 1959, and which was approved, subject to a few modifications of an
editorial nature, by the following Member Bodies :
Austria Germany Spain
Brazil Hungary Sweden
Burma India Switzerland
Canada Italy Republic of
South Africa
Czechoslovakia Japan
Finland Poland United Kingdom
France Romania U.S.S.R.
One Member Body opposed the approval of the Draft: U.S.A.
The Draft IS0 Recommendation concerning the Inch Series (No. 279), was circulated
It was approved, subject to a few
in May 1959 to all the IS0 Member Bodies for enquiry.
modifications of an editorial nature, by the following Member Bodies :
Australia Greece Romania
Austria Hungary Spain
Burma India Sweden
Canada Italy
Switzerland
Chile Japan United Kingdom
Czechoslovakia Netherlands U.S.A.
France Poland
Germany Portugal
One Member Body opposed the approval of the Draft: U.S.S.R.
These two combined Draft IS0 Recommendations were then submitted by correspon-
dence to the IS0 Council, which decided, in December 1963, to accept them as an IS0
RECOMMENDATION.
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IS0 / R 355 / Pari I . 1963 (E)
CONTENTS
Page
1 . Metric series . 5
1.1 Diameter series 2
1.1.1 Dimensions in millimetres . 6
1.1.2 Dimensions in inches . 7
.
1.2 Diameter series 3
1.2.1 Dimensions in millimetres . . 8
1.2.2 Dimensions in inches . . 9
2 . Inchseries . 10
2.1 Line 1
2.1. I Dimensions in inches . 11
2.1.2 Dimensions in millimetres . 12
2.2 Line 2
2.2.1 Dimensions in inches . 13
2.2.2 Dimensions in millimetres . 14
3
2.3 Line
2.3.1 Dimensions in inches . 15
2.3.2 Dimensions in millimetres . 16
2.4 Line 4
2.4.1 Dimensions in inches . 17
2.4.2 Dimensions in millimetres . 18
2.5 Line 5
2.5.1 Dimensions in inches . 19
2.5.2 Dimensions in millimetres . 20
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IS0 / R 355 / Pari I - 1963 (E)
IS0 Recommendation R 355 Decem ber 1963
ROLLING BEARINGS
TAPERED ROLLER BEARING§
BOUNDARY DIMENSIONS
1. METRIC SERIES
Y
d = bearing bore diameter
D = bearing outside diameter
B = inner ring width
T = bearing width * (width over bearing rings)
r = chamfer dimension ** (height and width) on inner and outer ring backfaces
r1 = chamfer dimension ** (height and width) on inner and outer ring frontfaces
* Attention is caiied to the fact that the cage may project beyond the bearing width.
** Nominal chamfer dimensions do not control the shape of the bearing corner.
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1.1 Diameter series 2
1.1.1 Dimensions in millimetres
Dimension series
Chamfer
02 22
Bore Outside
____
diameter
diameter
Inner ring Bearing Inner ring Bearing r
y1
nominal
width width width nominal
width
d D B T B T
0.3
30 9 9.7 14 14.7 1
10
0.3
12 32 10 10.75 14 14.75 1
1 0.3
15 35 11 11.75 14 14.75
17 40 12 13.25 16 17.25 1.5 O. 5
1.5 0.5
20 47 14 15.25 18 19.25
1.5 0.5
22 50 14 15.25 18 19.25
52 15 16.25 18 19.25 1.5 O. 5
25
58 16 17.25 19 20.25 1.5 O. 5
28
O. 5
30 62 16 17.25 20 21.25 1.5
17 22.25 1.5 0.5
32 65 18.25 21
72 17 18.25 23 24.25 2 0.8
35
0.8
40 80 18 19.75 23 24.75 2
2 0.8
45 85 19 20.75 23 24.75
23 24.75 2 0.8
50 90 20 21.75
21 22.75 25 26.75 2.5 0.8
55 1 O0
2.5 0.8
60 110 22 23.75 28 29.75
23 24.75 31 32.75 2.5 0.8
65 120
125 24 26.25 31 33.25 2.5 0.8
70
2.5 0.8
75 130 25 27.25 31 33.25
3 1
80 140 26 28.25 33 35.25
36 3 1
85 150 28 30.5 38.5
3 1
90 160 30 32.5 40 42.5
3.5 1.2
95 170 32 34.5 43 45.5
34 46 49 3.5 1.2
1 O0 180 37
1.2
105 190 36 39 50 53 3.5
3.5 1.2
110 200 38 41 53 56
- -
61.5 3.5 1.2
120 215 58
- -
4 1.5
230 64 67.75
130
- -
4 1.5
250 68 71.75
140
-
-
73 77 4 1.5
150 270
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IS0 / R 355 / Part I - 1963 (E)
1.1.2 Dimensions in inches
Dimension series
Chamfer
Bore 02 22
Outside
diameter diameter
Inner ring Bearing Inner ring Bearing
r
r?
width width nominal nominal
width width
d D B T B T
~~
0.39370 1.18110 0.3543 0.3819 0.5512 0.5787 0.039 0.012
0.47244
1.25984 0.3937 0.4232 0.5512 0.5807 0.039 0.0 12
0.59055 1.37795
0.4331 0.4626 0.5512 0.5807 0.039 0.012
0.66929 1.57480 0.4724 0.5217 0.6299 0.6791 0.059 0.020
0.78740
1.85039 0.5512 0.6004 0.7087 0.7579 0.059 0.020
0.86614 1.96850
0.5512 0.6004 0.7087 0.7579 0.059 0.020
0.98425 2.04724 0.5906 0.6398 0.7087 0.7579 0.059 0.020
1.10236 2.28346 0.6299 0.679 1 0.7480 0.7972 0.059 0.020
1.18110
2.44094 0.6299 0.6791 0.7874 0.8366 0.059 0.020
1.25984 2.55906 0.6693 0.7185 O. 8268 0.8760 0.059
0.020
1.37795 2.83465 0.6693 0.7185 0.9055 0.9547 0.079 0.03 1
1.57480 3.14961 0.7087 0.7776 0.9055 0.9744 0.079 0.03 1
1.77165 3,34646 0.9055
0.7480 0.8169 0.9744 0.079 0.03 1
1.96850 3.54331 0.7874 0.8563 0.9055 0.9744 0.079
0.03 1
2.16535 3.93701 0.8268 0.8957 0.9843 1.0531 0.098 0.03 1
2.36220 4.3307 1
0.8661 0.9350 1.1024 1.1713 0.098 0.031
2.55906 4.72441 0.9055 0.9744 1.2205 1.2894
0.098 0.031
2.75591 4.92126 0.9449 1.0335 1.2205 1.3091 0.098 0.03 1
2.95276 5.1 181 1 0.9843 1 .O728 1.2205 1.3091 0.098 0.031
3.14961 5.51181 1.2992
1 .O236 1.1122 1.3878 0.118 0.039
3.34646 5.90551 1.1024 1.2008 1.4173 1.5157 0.118 0.039
3.54331 6.29921 1.1811 1.2795 1.5748 1.6732 0.118 0.039
3.740 16 6.69291 1.2598 1.3583 1.6929 1.7913 0.138 0.047
3.93701 7.08661 1.3386 1.4567 1.8110 1.9291
0.138 0.047
4.13356 7.4803 1 1.4173 1.5354 1.9685 2.0866 0.138 0.047
4.33071 7.87402 1.4961 1.6142 2.0866 2.2047 0.138 0.047
- -
4.72441 8.46457 2.2835 2.4213 0.138
0.047
- -
5.11811 9.05512 2.5197 2.6673 0.157 0.059
- -
5.51181 9.84252 2.6772 2.8248 O. 157 0.059
- -
5.90551 10.62992 2.8740 3.03 15 0.157 0.059
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IS0 / R 355 / Pari I - 1963 (E)
1.2 Diameter series 3
1.2.1 Dimensions in millimetres
Dimension series
Chamfer
Outside 03 23
Bore
diameter diameter
Inner ring Bearing Inner ring Bearing
r
r!
width nominal nominal
width width width
D B T B T
d
--
11.9 17 17.9 1 0.3
10 35 11
12 12.9 17 17.9 1.5 0.5
12 37
15 42 13 14.25 17 18.25 1.5 0.5
15.25 19 1.5 O. 5
17 47 14 20.25
15 16.25 21 22.25 2 0.8
20 52
56 16 17.25 21 22.25 2 0.8
22
25 62 17 18.25 24 25.25 2 0.8
19.75 24 25.75 2 o. 8
28 68 18
19 20.75 27 28.75 2 0.8
30 72
32 75 20 21.75 28 29.75 2 0.8
35 80 21 22.75 31 32.75 2.5 0.8
33 35.25
40 90 23 25.25 2.5 0.8
45 1 O0 25 27.25 36 38.25 2.5 0.8
50 110 27 29.25 40 42.25 3 1
55 120 29 31.5 43 45.5 3 1
33.5 46 48.5 3.5 1.2
60 130 31
140 33 36 48 51 3.5 1.2
65
150 35 38 51 54 3.5 1.2
70
40 55 58 3.5 1.2
75 160 37
39 42.5 58 61.5 3.5 1.2
80 170
180 41 44.5 60 63.5 4 1.5
85
190 43 46.5 64 67.5 4 1.5
90
67 71.5 4 1.5
95 200 45 49.5
- -
73 77.5 4 1.5
1 O0 215
- -
81.5 4
105 225 77 1.5
- -
80 84.5 4 1.5
110 240
- -
86 90.5 4 1.5
120 260
- -
280 93 98.75 5 2
130
- -
2
140 300 102 107.75 5
-
-
108 114 5 2
150 320
-8-
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IS0 / R 355 / Part I - 1963 (E)
~~
1.2.2 Dimensions in inches
Dimension series
Chamfer
Bore Outside 03 23
diameter diameter
Inner ring Bearing Inner ring Bearing
r
"
nominal nominal
width width width width
d D B T B T
~~
0.39370 1.37795 0.433 1 0.4635 0.6693 0.7047 0.039 0.012
0.47244 1.45669 0.4724 0.5079 0.6693 0.7047 0.059 0.020
0.59055 1.65354 0.51 18 0.5610 0.6693 0.7185 0.059 0.020
0.5512 0.7480 0.7972 0.059 0.020
0.66929 1.85039 0.6004
O. 78 740 2.04724 0.5906 0.6398 0.8268 0.8760 0.079 0.03 1
0.86614 2.20472 0.6299 0.679 1 0.8268 0.8760 0.079 0.03 1
2.44094 0.6693 0.9941 0.079 0.031
0.98425 0.7185 0.9449
1.10236 2.67717 0.7087 0.7776 0.9449 1.0138 0.079 0.03 1
1.18110 2.83465 0.7480 0.8169 1 .O630 1.1319 0.079 0.03 1
1.25984 2.95276 0.7874 0.8563 1.1024 1.1713 0.079 0.031
1.2894 0.098 0.03 1
1.37795 3.14961 0.8268 0.8957 1.2205
3.54331 0.9055 1.2992 1.3878 0.098 0.031
1.57480 0.9941
1.5059 0.031
1.77165 3.93701 0.9843 1 .O728 1.4173 0.098
1.6634 0.118 0.039
1.96850 4.33071 1 .O630 1.1516 1.5748
4.7244 1 1.1417 1.6929 1.7913 0.118 0.039
2.16535 1.2402
2.36220 5.11811 1.2205 1.3169 1.8110 1.9094 0.138 0.047
2.55906 5.51181 1.2992 1.4173 1.8898 2.0079 0.138 0.047
2.1260 O. 138 0.047
2.75591 5.90551 1.3780 1.496 1 2.0079
2.95276 6.29921 1.4567 1.5748 2.1654 2.2835 O. 138 0.047
0.047
3.14961 6.69291 1.5354 1.6732 2.2835 2.4213 0.138
1.6142 2.5000 0.157 0.059
3.34646 7.08661 1.7520 2.3622
7.48031 1.6929 1 A307 2.5197 2.6575 O. 157 0.059
3.54331
7.87402 1.7717 1.9488 2.6378 2.8150 0.157 0.059
3.74016
- -
3.93701 8.46457 2.8740 3.0512 O. 157 0.059
-
-
8.8 5827 3.0315 3.2087 0.157 0.059
4.13356
- -
4.33071 9.44882 3.1496 3.3268 0.157 0.059
- -
0.157 0.059
4.72441 10.23622 3.3858 3.5630
- -
3.6614 3.8878 0.197 0.079
5.1 181 1 1 1 .O2362
-
-
1 1.8 1 102 4.01 57 4.2421 0.197 0.079
5.51181
- -
12.59843 4.2520 4.4882 0.197 0.079
5.90551
-~
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IS0 / R 355 / Pari I - 1963 (E)
2. INCH SERIES
d = bearing bore diameter
D = bearing outside diameter
B = inner ring width
T = bearing width * (width over bearing rings)
R = chamfer dimension ** (height and width) on inner ring backface
r = chamfer dimension ** (height and width) on outer ring backface
* Attention is called to the fact that the cage may project beyond the bearing width.
** Chamfer dimensions do not control the shape of the bearing corner (see, however, definition of “Low limit” in the
relevant IS0 Recommendation).
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2.1 Line 1
2.1.1 Dimensions in inches
~~
Chamfer
Bore Outside Inner ring Bearing
diameter width
diameter width
&in. * ‘min. * *
d D B T
0.4375 0.062 0.062
0.625 1.4380 0.4375
0.4391 0.040 0.046
0.750 1.6250 0.4687
1.8750 0.5625 0.062 0.062
0.875 0.5625
1 .O00 1.9687 0.5614 0.5625 0.040 0.062
0.5625 0.062 0.062
1.125 2.1875 0.5625
1.250 2.3280 0.6600 0.6250 0.140 0.046
1.375 2.5625 0.7200 0.7100 0.140 0.046
1 SO0 2.7170 0.7500 0.7100 0.078 0.062
0.062
1.750 2.8750 0.7188 0.7188 0.062
2.000 3.1875 0.7188 0.7188 0.062 0.062
2.
...