ENGINEERING INFORMATION

TABLE OF CONTENTS
ENGINEERING INFORMATION
SHAFT AND HOUSING FITS
LUBRICATION
LIFE AND LOAD RATINGS
RADIAL CLEARANCE CHART
SHAFT AND HOUSING FITS FOR METRIC RADIAL BALL AND ROLLER BEARINGS
To select the proper fits, it is necessary to consider the For stationary shaft conditions and constant radial load
type and extent of the load, bearing type, and certain direction, the inner ring may be moderately loose on the
other design and performance requirements. shaft.
The required shaft and housing fits are indicated in Note that for pure thrust (axial) loading, heavy inter-
Tables 1 and 3. The terms “Light”, “Normal” and “Heavy” ference fits are not necessary as a moderately loose to
loads refer to radial loads that are generally within the tight shaft fit only is needed.
following limits (C being the Basic Dynamic Load Rating
Table 2 shows how the tolerance ranges of the various
computed in accordance with ABMA-ANSI Standards).
classifications deviate from the basic bore diameters.
Radial Ball Roller
Housing Fits. Table 3 indicates the initial approach to
Load Bearings Bearings
housing fit selection. Note that the use of clearance or
Light up to 0.07C up to 0.08C interference fits is mainly dependent upon which bearing
Normal from 0.07C from 0.08C ring rotates in relation to the radial load. For indetermi-
to 0.15C to 0.18C nate or varying load directions, avoid clearance fits.
Heavy over 0.15C over 0.18C Clearance fits are preferred in axially split housings to
avoid distorting bearing outer rings. The extent of the
Shaft Fits. Table 1 indicates the initial approach to
radial load also influences the choice of fit.
shaft fit selection. Note that for most normal applications
where the shaft rotates and the radial load direction is Table 4 shows how the tolerance ranges of the various
constant, an interference fit should be used. Also, the classifications deviate from the basic outside diameters.
heavier the load, the greater is the required interference.

TABLE 1 – SELECTION OF SHAFT TOLERANCE CLASSIFICATIONS

For Metric Radial Ball and Roller Bearings of Tolerance Classes ABEC-1, RBEC-1
DESIGN & OPERATING BALL CYLINDRICAL SPHERICAL
CONDITIONS BEARINGS ROLLER BEARINGS ROLLER BEARINGS
Inner Ring d Tolerance d Tolerance d Tolerance
Rotational Axial Radial mm inch Classifi- mm inch Classifi- mm inch Classifi-
Conditions Displaceability Loading Over Incl. Over Incl. cation 1 Over Incl. Over Incl. cation 1 Over Incl. Over Incl. cation 1
0 40 0 1.57 j62 0 40 0 1.57 j62
0 18 0 0.71 h5 40 140 1.57 5.51 k62 40 100 1.57 3.94 k62
Light 18 All 0.71 All j62 140 320 5.51 12.6 m62 100 320 3.94 12.6 m62
320 500 12.6 19.7 n6 320 500 12.6 19.7 n6
Inner Ring 500 All 19.7 All p6 500 All 19.7 All p6
Rotating 0 40 0 1.57 k5 0 40 0 1.57 k5
in relation 40 100 1.57 3.94 m5 40 65 1.57 2.56 m5
to load Normal 0 18 0 0.71 j5 100 140 3.94 5.51 m6 65 100 2.56 3.94 m6
direction 18 All 0.71 All k5 140 320 5.51 12.6 n6 100 140 3.94 5.51 n6
320 500 12.6 19.7 p6 140 280 5.51 11.0 p6
or 500 All 19.7 All r6 280 500 11.0 19.7 r6
500 All 19.7 All r7
Load 0 40 0 1.57 m5 0 40 0 1.57 m5
Direction 18 100 0.71 3.94 k5 40 65 1.57 2.56 m6 40 65 1.57 2.56 m6
indeter- Heavy 100 All 3.94 All m5 65 140 2.56 5.51 n6 65 100 2.56 3.94 n6
minate 140 200 5.51 7.87 p6 100 140 3.94 5.51 p6
200 500 7.87 19.7 r6 140 200 5.51 7.87 r6
500 All 19.7 All r7 200 All 7.87 All r7
Inner Ring must Light
Inner Ring be easily axially Normal All Sizes g6 All Sizes g6 All Sizes g6
Stationar y displaceable Heavy
in relation Inner Ring need Light
to load not be easily ax- Normal All Sizes h6 All Sizes h6 All Sizes h6
direction ially displaceable Heavy

Pure Thrust (Axial) Load All Sizes j6 Consult Bearing Manufacturer

1
Tolerance classifications shown are for solid steel shafts. Numerical values are listed
in Table 2.
For hollow or non-ferrous shafts, tighter fits may be needed.
2
If greater accuracy is needed, substitute j5, k5 and m5 for j6, k6 and m6 respectively. © Copyright, American Bearing Manufacturers Association, 1995.

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 TABLE 2 – SHAFT DIAMETER TOLERANCE LIMITS
For Metric Radial Ball and Roller Bearings of Tolerance Classes ABEC-1, RBEC-1

Dimensions and deviations in inches and millimeters

Tolerance Limits in Inches

d TOLERANCE CLASSIFICATIONS
inch mm g6 h6 h5 j5 j6 k5 k6 m5 m6 n6 p6 r6
Over Incl. Dev. Over Incl. Dev.
0.1181 0 3 0 -.0002 0 0 +.0001 +.0002 +.0002 +.0004
0.2362 -.0003 6 -.008 -.0005 -.0003 -.0002 -.0001 -.0001 0 +.0002
0.2362 0 6 0 -.0002 0 0 +.0002 +.0003 +.0003 +.0005
0.3937 -.0003 10 -.008 -.0006 -.0004 -.0002 -.0001 -.0001 0 +.0002
0.3937 0 10 0 -.0002 0 0 +.0002 +.0003 +.0004 +.0006
0.7087 -.0003 18 -.008 -.0007 -.0004 -.0003 -.0001 -.0001 0 +.0003
0.7087 0 18 0 -.0003 0 +.0002 +.0004 +.0004 +.0007
1.1811 -.0004 30 -.010 -.0008 -.0005 -.0002 -.0002 +.0001 +.0003
1.1811 0 30 0 -.0004 0 +.0002 +.0004 +.0005 +.0007 +.0008 +.0010
1.9685 -.0045 50 -.014 -.0010 -.0006 -.0002 -.0002 +.0001 +.0001 +.0004 +.0004
1.9685 0 50 0 -.0004 0 +.0002 +.0005 +.0006 +.0008 +.0009 +.0012 +.0015
3.1496 -.0006 80 -.015 -.0011 -.0007 -.0003 -.0003 +.0001 +.0001 +.0004 +.0004 +.0008
3.1496 0 80 0 -.0005 0 +.0002 +.0005 +.0007 +.0010 +.0011 +.0014 +.0018 +.0023
4.7244 -.0008 120 -.020 -.0013 -.0009 -.0004 -.0004 +.0001 +.0001 +.0005 +.0005 +.0009 +.0015
4.7244 0 120 0 -.0006 0 +.0003 +.0006 +.0008 +.0011 +.0013 +.0016 +.0020 +.0027 +.0035
7.0866 -.0010 180 -.025 -.0015 -.0010 -.0004 -.0004 +.0001 +.0001 +.0006 +.0006 +.0011 +.0017 +.0026

© Copyright, American Bearing Manufacturers Association, 1995.

TABLE 3 – SELECTION OF HOUSING TOLERANCE CLASSIFICATIONS

For Metric Radial Ball and Roller Bearings of Tolerance Classes ABEC-1, RBEC-1
DESIGN AND OPERATING CONDITIONS
Outer Ring TOLERANCE
Rotational Other Axial CLASSIFI-
Conditions Loading Conditions Displaceability CATION1
Heat input
through G73
shaft
Light
Housing Outer Ring
Normal
Outer Ring split easily axially H72
or
Stationar y axially displaceable
Heavy
in relation to
load direction H62
Housing not
Shock with split
temporary complete axially J62
unloading Transitional
Load Light Range4
Direction Normal or Heavy K6 2
Split
indeterminate Heavy Shock not M62
Light
Outer Ring recommended
Normal or Heavy N62
Rotating Outer Ring not
in relation to Thin wall
Heavy easily axially P62
load direction housing displaceable
not split
1
For cast iron steel housings, numerical values are listed in Table 4. For housings of non-ferrous alloys tighter fits
may be needed.
2
Where wider tolerances are permissible, use tolerance classifications H8, H7, J7, K7, M7, N7 and P7 in place of
H7, H6, J6, K6, M6, N6 and P6 respectively.
3
For large bearings and temperature differences between outer ring and housings greater than 10°C, F7 may be
used instead of G7.
4
The tolerance zones are such that outer ring may be either tight or loose in the housing.

© Copyright, American Bearing Manufacturers Associations, 1995.

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 TABLE 4 – HOUSING BORE TOLERANCE LIMITS
For Metric Radial Ball and Roller Bearings of Tolerance Classes ABEC-1, RBEC-1

b TOLERANCE CLASSIFICATIONS
inch mm F7 G7 H8 H7 H6 J6 J7 K6 K7 M6 M7 N6 N7 P6 P7
Over Incl. Dev. Over Incl. Dev.

.3937 0 10 +0 +.0006 +.0002 0 0 0 -.0002 -.0003 -.0004 -.0005 -.0006 -.0007 -.0008 -.0009 -.0010 -.0011

.7087 -.0003 18 -.008 +.0013 +.0009 +.0011 +.0007 +.0004 +.0002 +.0004 +.0001 +.0002 -.0002 0 -.0004 -.0002 -.0006 -.0004

.7087 0 18 +0 +.0008 +.0003 0 0 0 -.0002 -.0004 -.0004 -.0006 -.0007 -.0008 -.0009 -.0011 -.0012 -.0014

1.1811 -.0035 30 -.009 +.0016 +.0011 +.0013 +.0008 +.0005 +.0003 +.0005 +.0001 +.0002 -.0002 0 -.0004 -.0003 -.0007 -.0006

1.1811 0 30 +0 +.0010 +.0004 0 0 0 -.0002 -.0004 -.0005 -.0007 -.0008 -.0010 -.0011 -.0013 -.0015 -.0017

1.9685 -.0045 50 -.011 +.0020 +.0013 +.0015 +.0010 +.0006 +.0004 +.0006 +.0001 +.0003 -.0002 0 -.0005 -.0003 -.0008 -.0007

1.9685 0 50 +0 +.0012 +.0004 0 0 0 -.0002 -.0005 -.0006 -.0008 -.0009 -.0012 -.0013 -.0015 -.0018 -.0020

3.1496 -.0005 80 -.013 +.0024 +.0016 +.0018 +.0012 +.0007 +.0005 +.0007 +.0002 +.0004 -.0002 0 -.0006 -.0004 -.0010 -.0008

3.1496 0 80 +0 +.0014 +.0005 0 0 0 -.0002 -.0005 -.0007 -.0010 -.0011 -.0014 -.0015 -.0018 -.0020 -.0023

4.7244 -.0006 120 -.015 +.0028 +.0019 +.0021 +.0014 +.0009 +.0006 +.0009 +.0002 +.0004 -.0002 0 -.0006 -.0004 -.0012 -.0009

4.7244 0 120 +0 +.0017 +.0006 0 0 0 -.0003 -.0006 -.0008 -.0011 -.0013 -.0016 -.0018 -.0020 -.0024 -.0027

5.9055 -.0007 150 -.018 +.0033 +.0021 +.0025 +.0016 +.0010 +.0007 +.0010 +.0002 +.0005 -.0003 0 -.0008 -.0005 -.0014 -.0011

5.9055 0 150 +0 +.0017 +.0006 0 0 0 -.0003 -.0006 -.0008 -.0011 -.0013 -.0016 -.0018 -.0020 -.0024 -.0027

7.0866 -.0010 180 -.025 +.0033 +.0021 +.0025 +.0016 +.0010 +.0007 +.0010 +.0002 +.0005 -.0003 0 -.0008 -.0005 -.0014 -.0011

7.0866 0 180 +0 +.0020 +.0006 0 0 0 -.0003 -.0006 -.0009 -.0013 -.0015 -.0018 -.0020 -.0024 -.0028 -.0031

9.8425 -.0012 250 -.030 +.0038 +.0024 +.0028 +.0018 +.0011 +.0009 +.0012 +.0002 +.0005 -.0003 0 -.0009 -.0006 -.0016 -.0013

9.8425 0 250 +0 +.0022 +.0007 0 0 0 -.0003 -.0006 -.0011 -.0014 -.0016 -.0020 -.0022 -.0026 -.0031 -.0035

12.4016 -.0014 315 -.035 +.0043 +.0027 +.0032 +.0020 +.0013 +.0010 +.0014 +.0002 +.0006 -.0004 0 -.0010 -.0006 -.0019 -.0014

Example:
Bearing No. 6203 (17mm x 40mm x 12mm). Application: Electric motor (shaft and bearing inner ring rotating).
Load 20 lbs. radial
Per catalog Page 7: Basic Dynamic Load Rating (c) = 2153 lbs.
Load = 20 lbs. = .009
c 2153 lbs.
Radial load is less than .07 of Dynamic Load rating (c); therefore, load is “light”.
Table 1: Inner ring rotating, light radial load, 17 mm inner diameter: Tolerance classification should be h5.
Table 2: 17mm inner diameter (.6693”) and h5 tolerance: Shaft diameter tolerance is +0”, –.0003”. Shaft diameter should be .6693” max., .6690” min.
Table 3: Outer ring stationary, light load, housing not split axially: Tolerance classification should be H6.
Table 4: 40mm outer diameter (1.5748”) and H6 tolerance: Housing bore diameter tolerance is +0”, +.0006”. Housing bore diameter should be 1.5754”
max., 1.5748” min.

© Copyright, American Bearing Manufacturers Associations, 1995.

44 High Street, West Nyack, NY 10994

Tel (845) 358-6000 ■ Fax (845) 358-7415 GENERAL BEARING CORPORATION
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 LUBRICATION
Lubrication is essential to prevent premature ball operating efficiency. Conventional types fall into the
bearing failure. Probably the most critical factor in main- classifications of oil or grease, each with specific
taining operating conditions, the lubricant functions to: properties correct for different bearing applications.
Generally, grease is the preferred choice due to its ease
1) minimize friction between balls and raceways,
of application and maintenance, performing well in the
2) act as a preventative against rust and corrosion, 0°F to 300°F operating range. Oil, however, does
function better in extreme temperature conditions, below
3) dissipate heat build-up, and –40°F or above 350°F.
4) provide a barrier against the entry of foreign matter. The following chart recommends the ten key lubricants
The type of lubricant used also plays a critical factor in used by General Bearing Corporation.
CHARACTERISTICS OF GREASE LUBRICANTS
USED IN GENERAL BEARING PRODUCTS
COMPANY OPERATING
TRADEMARK MIL SPEC BASE OIL THICKENER RANGE CHARACTERISTICS

Chevron MIL-G-3545G Mineral Polyurea -20° to 350°F Rust inhibitive petroleum

SRI #2 oil with a worked penetra-
tion of 265. Water resistant
properties.

Dow Corning Silicon -0° to 550°F Worked penetration of 280.

DC41 Excellent for high tempera-
ture requirements.

DuPont MIL-G-27617A Fluorocarbon Uidax -30° to 550°F Worked penetration of 295.

Krytox 240AC Excellent for both high and
low temperature applications.

Exxon MIL-G-3278 Diester Lithium -65° to 250°F Excellent for low temperature
Beacon 325 applications.

Exxon Mineral Sodium -20° to 250°F Worked penetration of 205.

Andok C General purpose. Good
channeling grease.

Mobil MIL-G-81322D Synthetic Clay Bentonite -65° to 350°F Excellent for high and low
28 Hydrocarbon temperature applications.

Shell MIL-G-18709 Mineral Lithium -20° to 250°F Worked penetration of 287.

Alvania 2 General purpose lubrication.

Shell MIL-G-23827B Diester Microgel -100° to 300°F Worked penetration of 288.

Aeroshell 7 Excellent for low temperature
lubrication qualities.

Shell Mineral Polyurea -30° to 300°F Worked penetration of 285.

Dolium R #2 Low noise level, high thermal
stability. Water resistant
properties.

Kyodo Yushi Synthetic Lithium –40° to 300°F Long performance life.

Multemp SRL Hydrocarbon Excellent for high and low
temperature applications.

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BEARING LIFE AND LOAD RATINGS
How long a ball bearing will last under load depends on The relationship between bearing life and applied load
two groups of variables. First, there are the bearing’s can be expressed as:
physical characteristics, which include how it is designed,
Life in Revolutions:
the material from which it is made, and how it is manu-
3
factured. Secondly, there are the conditions under which
it is applied, such as load, operating speed and temper-
ature, the way it is mounted, and the way it is lubricated.
L10 = ( )
C
__
P
x 10
6

Life in Hours:
Even if a ball bearing is operated under ideal condi-
3
tions — where it has been properly mounted, lubricated,
protected from foreign particles, and not subjected to L10 = ( )
C
__
P
16667
N
extreme temperature or speed — it will ultimately fail due
to either material fatigue or wear. Fatigue failure results
from the repeated stresses that are developed in the con- Where:
tact areas between the balls and raceways. Failure L10 = The rating life
shows up as spalling of the load-carrying surfaces. C = The basic dynamic capacity as shown in the
Excessive wear occurs when operating conditions are catalog
other than ideal. These conditions are generally those P = The equivalent radial load on the bearing in
which cause high friction and/or heat within the bearing. pounds
N = Speed in RPM
PREDICTING BEARING LIFE Consult the factory for other life factors.
It is not possible to predict the exact fatigue life of an
individual bearing. Instead, the designer of a system EQUIVALENT RADIAL LOAD
incorporating ball bearings must rely on the results of Bearings often must carry a combination of radial and
extensive research and testing done on the life of groups thrust loads. The equations stated in the previous section
of identical bearings operated under identical conditions. are based solely on radially loaded bearings. Therefore,
Tests show that lifetimes of such operated bearings vary when radial and axial loads are present, an equivalent
due to intricate differences between individual bearings. radial load (P) must be calculated. The equivalent radial
These lifetimes, however, follow definite statistical distri- load is the greater of:
butions. Load ratings, boundary dimensions, and toler-
P = XFr + YFa
ances for ball bearings and cylindrical roller bearings are
P = Fr
computed from ABMA and ISO standards.
Where:
Such statistical distributions can be represented by
equations which relate predicted bearing life to factors P = Equivalent radial load in pounds
like the load it must bear, its operating speed, and the Fr = Applied radial load in pounds
bearing’s physical characteristics. It is up to the designer Fa = Applied axial load in pounds
to then determine which bearing is best for a particular X = Radial load factor = 0.56
application by use of these equations. Y = Axial load factor dependent on the magnitude
of Fa/Co
L10, or rating life, is the life most commonly used in
Co = Catalog static load rating in pounds (definition
load calculations. It is the life in units of either hours or
to follow:
millions of revolutions that 90% of a group of apparently
identical ball bearings will complete or exceed. Another Fa/Co Y
accepted form is L50, or median life. It is the life which 0.014 2.30
50% of a group of bearings will complete or exceed. L50 0.028 1.99
is usually not more than five times L10. 0.056 1.71
Another important definition is that of the basic 0.084 1.55
dynamic load rating “C”. For a radial ball bearing, the 0.11 1.45
basic dynamic load rating is the constant radial load 0.17 1.31
which a group of identical bearings with a stationary 0.28 1.15
outer ring can theoretically endure for 500 hours at 0.42 1.04
33-1/3 RPM (1,000,000 revolutions). 0.56 1.00

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 STATIC LOAD RATING
Co, the static load rating is the non-rotating radial load Example 2:
which produces a maximum contact stress of 667,000 Determine the minimum static and dynamic load ratings
pounds per square inch at any point within the bearing. required to carry a 300 pound radial load, and 75 pound
When static load exceeds the catalog rating, a significant axial load for 3500 hours at 650 RPM.
decrease in bearing smoothness and life can be expected C = Unknown
when rotation is resumed.
Co = Unknown
As with dynamic load ratings, static loads are usually a P = Unknown
combination of radial and thrust loads. Equivalent static
Po = Unknown
load must therefore be calculated.
Y = Unknown
The static equivalent load for radial ball bearings is the
X = .56
greater of:
Fr = 300 lbs.
Po = .6 Fr + .5 F a
Fa = 75 lbs.
Po = Fr N = 659 RPM

Where: L = 3500 hrs.

Po = .6 Fr + .5 F a = 217.5 lbs.
Po = Equivalent static radial load in pounds
or
Fr = Applied radial load in pounds
Po = Fr = 300 lbs.
Fa = Applied axial load in pounds
Therefore Po = Co minimum = 300 lbs.
Fa/Co = 75/300 = 0.25

EXAMPLES OF LIFE AND LOAD CALCULATIONS Then by interpolation Y = 1.19

Example 1:
Equivalent radial load
Determine the L10 life hours of a 6203 ball bearing
P = XFr + YFa = .56 (300) + 1.19 (75) = 257.3 lbs.
operating at 800 RPM with a radial load of 250 lbs.
or
The Basic Dynamic capacity from the catalog is
C = 2153 lbs. P = Fr = 300 lbs. Therefore P = 300 lbs.

3
L10 = Unknown

C = 2153 lbs.
L10 = ( )(
C
__
P
16667
_____
N )
or
Fr = P = 250 lbs. 1/3
L10N

N = 800 RPM
C= ( ______
16667 ) P

or
3
L10 = ( )( C
___
P
16667
_____
N ) C= ( (3500)(650)
___________
)
1/3

300 = 1545 lbs.

16667
3

L10 = ( 2153
_____
250 ) ( 16667
_____
800 ) Answer: Co minimum = 300 lbs.

L10 = 13307 hours C minimum = 1071 lbs.

®

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RADIAL INTERNAL CLEARANCE
Radial internal clearance is a measure of the radial dependent on many factors such as shaft alignment,
looseness, or play between the inner and outer rings. shaft and housing fits, bearing speed, etc. As RPM,
Precision bearings are available in five classes of shaft misalignment, and press fits increase in magni-
looseness. The amount of looseness necessary is tude, so should radial play.

RADIAL INTERNAL CLEARANCE, SINGLE ROW, RADIAL CONTACT, BALL BEARINGS

Tolerance Limits for Radial Internal Clearance of
Single Row, Radial Contact Ball Bearings Under No Load
(Applicable to Bearings of ABEC-1, ABEC-5, ABEC-7 and ABEC-9 Tolerance Classes)
TOLERANCE LIMITS IN 0.0001 INCH

BASIC BORE C-2 STANDARD C-3 C-4 C-5

DIAMETER ACCEPTANCE LIMITS
d
mm
Over Incl. Low High Low High Low High Low High Low High
2.5 6 0 3 1 5 3 9 — — — —

6 10 0 3 1 5 3 9 6 11 8 15

10 18 0 3.5 1 7 4.5 10 7 13 10 18

18 24 0 4 2 8 5 11 8 14 11 19

24 30 0.5 4.5 2 8 5 11 9 16 12 21

30 40 0.5 4.5 2.5 8 6 13 11 18 16 25

40 50 0.5 4.5 2.5 9 7 14 12 20 18 29

50 65 0.5 6 3 11 9 17 15 24 22 35

65 80 0.5 6 4 12 10 20 18 28 26 41

80 100 0.5 7 4.5 14 12 23 21 33 30 47

100 120 1 8 6 16 14 26 24 38 35 55

120 140 1 9 7 19 16 32 28 45 41 63

140 160 1 9 7 21 18 36 32 51 47 71

160 180 1 10 8 24 21 40 36 58 53 79

180 200 1 12 10 28 25 46 42 64 59 91

For additional information concerning mounting procedures, lubrication, variable speeds and loads, safety or service factors, and other technical data
necessary for proper bearing selection, contact our Engineering Department.

44 High Street, West Nyack, NY 10994

Tel (845) 358-6000 ■ Fax (845) 358-7415 GENERAL BEARING CORPORATION
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