CAT.NO.295E
MINIATURE AND EXTRA-SMALL BALL BEARINGS
1. Bearing Types and Features
CONTENTS
8. Bearing Lubrication
Deep Groove Ball Bearings - Standard series
Deep Groove Ball Bearings - Thin section series
Deep Groove Ball Bearings - Narrow-width series
Deep Groove Ball Bearings with Flanges - Standard series
Deep Groove Ball Bearings with Flanges - Thin section series
Deep Groove Ball Bearings with Resin Flanges - FN Bearings
Deep Groove Ball Bearings
Deep Groove Ball Bearings with Flanges
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Bearing Dimension Tables
Supplementary Tables
Metric series
Inch series
1. Bearing Number Correspondence Table2. Shaft Tolerances3. Housing Bore Tolerances4. Numerical Values for Standard Tolerance Grades IT5. Prefixes used with SI Units6. SI Units and Conversion Factors7. Inch / Millimeter Conversion8. Steel Hardness Conversion9. Viscosity Conversion
Bearing Technical Section
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1.1 Types and Features1.2 Designation Structure1.3 Cages
2.1 Bearing Life2.2 Calculation of Bearing Life2.3 Dynamic Equivalent Load2.4 Basic Static Load Rating and Static Equivalent Load
3. Bearing Tolerances
4.1 Correction of the Rotation Speed Limit4.2 Rotation Speed Limit for Sealed Deep Groove Ball Bearings
5. Bearing Fits
6. Bearing Internal Clearance
7. Preload of Bearings7.1 Objective of Preload7.2 Methods for Preloading7.3 Preload Force
2. Bearing Life and Load Rating
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8.1 Objective of Lubrication and Methods8.2 Grease Lubrication8.3 Oil Lubrication8.4 Grease Life of Shielded and Sealed Deep Groove Ball Bearings
9. Bearing Torque
10. Bearing Materials
11. Handling of Bearings11.1 General Precautions for Handling11.2 Storage of Bearings11.3 Mounting Bearings11.4 Trial Run and Inspection11.5 Removal of Bearings
12. Ceramic Bearings
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12.1 Properties of Ceramics12.2 Features of Ceramic Bearings12.3 Application Examples of Ceramic Bearings
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13. Products Information 33
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4. Rotation Speed Limit
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Miniature and Extra -small Ball Bearings
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MINIATURE AND EXTRA-SMALL BALL BEARINGS
CAT.NO.295E
New edition:MINIATURE AND EXTRA-SMALL BALL BEARINGS CATALOG
Rotation parts for information processing, audio, andvisual equipment that include such features as high toler-ance and low torque are highly desired by users. To meet such demands, we at KOYO exploit state-of-the-art research facilities and leading-edge productionmethods to improve the performance and life of toleranceminiature and extra-small ball bearings.
The information contained in this catalog is the result ofour research activities. We believe that this catalog willaid users in the selection and utilization of miniature andextra-small ball bearings.
Through our efforts in research and technical develop-ment, and by obtaining inspiration from the marketplace,KOYO can continually offer the best technologies, quality,and services. We trust that you will be as satisfied with our latestproducts and services as you have been in the past.
The contents of this catalog are subject to change without prior notice.Every possible effort has been made to ensure that the data listed in thiscatalog is correct.However, we can not assume responsibility for any errors or omissions.
Reproduction of this catalog without written consent is strictly prohibited
Preface
Thank you for your valuable support of KOYO products.Recent industrial applications demand more sophisticationin a variety of machines and equipment.
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1
Miniature and Extra -small Ball Bearings
1. Bearing Types and Features1.1 Types and Features1.2 Designation Structure1.3 Cages
2.1 Bearing Life2.2 Calculation of Bearing Life2.3 Dynamic Equivalent Load2.4 Basic Static Load Rating and Static Equivalent Load
3. Bearing Tolerances
4.1 Correction of the Rotation Speed Limit4.2 Rotation Speed Limit for Sealed Deep Groove Ball Bearings
4. Rotation Speed Limit
5. Bearing Fits 6. Bearing Internal Clearance 7. Preload of Bearings
7.1 Objective of Preload7.2 Methods for Preloading7.3 Preload Force
8. Bearing Lubrication8.1 Objective of Lubrication and Methods8.2 Grease Lubrication8.3 Oil Lubrication8.4 Grease Life of Shielded and Sealed Deep Groove Ball Bearings
9. Bearing Torque10. Bearing Materials11. Handling of Bearings
11.1 General Precautions for Handling11.2 Storage of Bearings11.3 Mounting Bearings11.4 Trial Run and Inspection11.5 Removal of Bearings
12. Ceramic Bearings
CONTENTS
2. Bearing Life and Load Rating
13. Products Information
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12.1 Properties of Ceramics12.2 Features of Ceramic Bearings12.3 Application Examples of Ceramic Bearings
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Bearing Technical Section
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4 ) Deep groove ball bearings with locating snap ring With this type of bearing, mounting in a housing is simple, asits positioning in the axial direction is carried out using a locatingsnap ring.
5 ) Shielded and sealed ball bearings These types of deep groove ball bearings are sealed by shieldsor rubber seals to prevent leakage of lubricating grease or entryof foreign matter. Since the appropriate quantity of a high quality lubricatinggrease is factory sealed, the sealed deep groove ball bearingallows simplification of sealing devices around the bearing andfacilitates easy handling.
1. Bearing Types and Features
1. Bearing Types and Features
Miniature and extra-small ball bearings includethose with outer ring flanges, thin section types,and narrow-width types, as well as standard ones.
1 ) Deep groove ball bearings
2 ) Deep groove ball bearings with outer ring flange
3 ) Deep groove ball bearings with resin flange (FN bearings)
1.1 Types and Features
This type of bearing can carry a radial load and axial load inboth directions simultaneously. Featuring low frictional torque, it is suitable for applicationswhere high rotation speed or low noise and vibration are required.
This type of deep groove ball bearing has a flange on one endof the outside surface. Since mounting is carried out using the side of the housing asreference, this type of bearing simplifies installation by easilypositioning itself in the axial direction.
In this type of bearing a resin flange is injection molded aroundthe outside surface, as an alternative to the solid outer ring flange. This newly developed item is approximately 10 % lighter than aconventional deep groove ball bearing with an outer ring flange.
The above are also categorized as open,shielded, and sealed types.
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Miniature and Extra -small Ball Bearings
: dual-sealed type: single-sealed type( )
( ): dual-sealed type: single-sealed type
( )
2RS, 2RDRS, RD
ZZ, ZZX, ZZLZ, ZX, ZL
: dual-shielded type: single-shielded type
2RU, 2RJ3RU, RJ3
(1) Shielded ball bearings ZZ (Z), ZZX (ZX) In this type of bearing, a press-worked shield is utilized. These bearings are classified as Z and ZX types accordingto the manner in which the shield is fixed to the outer ring. A ZL type, in which the inner ring is provided with a groove,is also available. A carbon steel or stainless steel plate is used for the shield.
(2) Contact sealed ball bearings 2RS (RS), 2RD (RD)
〈 Features of the RJ3 resin seal 〉 In a resin seal, resin is used in place of conventional rub-ber, offering high dust prevention ability.
(3) Non-contact sealed ball bearings 2RU (RU), 2RJ3 (RJ3) This type of sealed deep groove ball bearing utilizes a rub-ber or resin non-contact seal. Since the labyrinth is formedbetween the seal lip and the seal groove step in the innerring, it is superior in grease sealability and dust prevention. Being a non-contact type, it is suitable for high-speed appli-cations with low frictional torque requirements.
2RU 2RJ3
ZZ ZZX ZZL
2RS 2RD
〈 Features of the RD seal 〉 The RD seal has a labyrinth structure in the shape of aletter Z formed by the seal lip and inner ring seal groove. The torque requirement of this type of bearing is as low asthat of the non-contact type since the lip is extremely lightcontact with the seal groove of the inner ring, yet this newlydeveloped item offers excellent grease sealability and dustprevention.
Table 1.1 shows dimensional ranges of miniature andextra-small ball bearings.
Reference: Dimensional ranges of miniature and extra - small ball bearings
Remark: For bearings with a larger diameter than miniature and extra-small ball bearings, please refer to the comprehensive KOYO bearing catalog CAT. NO. 201E.
Table 1.1 Dimensional Ranges of Miniature and Extra - small Ball Bearings Unit mm
Classification Miniature Ball Bearing Extra - small Ball Bearing
Metric series
Inch series
D< 9 -
D≧ 9
d < 10
Nominal bearing outside diameter
Nominal bearing bore diameter
Nominal bearing outside diameter
Nominal bearing bore diameter
D< 9.525 -
D≧ 9.525
d < 10
Nominal bearing outside diameter
Nominal bearing bore diameter
Nominal bearing outside diameter
Nominal bearing bore diameter
A contact rubber seal is included on this type of sealed deepgroove ball bearing. This type of bearing offers excellent grease sealability anddust prevention as its structure is such that the seal lip is incontact with either the shoulder of the inner ring (outside sur-face of inner ring) or with the shoulder step. These bearings come in RS and RD types.
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1.2 Designation Structure
The designation of a bearing indicates the specifications of
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/ 1B
specific internal structure
specific bearing outside diameter
specific bearing width
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Z,ZZ ZX,ZZX RS,2RS RD,2RD RU,2RURJ3,2RJ3
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No code
STbearing steel
stainless steel
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M1M2M3
0 ~ 5μm3 ~ 8μm5 ~10μm
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M4M5M6
8 ~ 13μm13 ~ 20μm20 ~ 28μm
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/ /YSMGFG
steel plate -- pressed cage
stainless steel plate -- pressed cage
reinforced polyamide resin -- molded cage
heat - resistant reinforced polyamide resin --molded cage
::::
P0P6P5P4P2
JIS class 0
JIS class 6
JIS class 5
JIS class 4
JIS class 2
:::::
::::
specific class (PZ1 - )
ABMA 5PABMA 7PABMA 9P
Oil
GreaseAero Shell fluid12Multemp SRLAndok CMultemp PS2Beacon 325SH44MBarrierta JFE552KNG144
::::::::
E FSRACP2B54MBJKN
( For other greases, see Tables 8.2 and 8.3 on page 23 )
NNR
with snap ring groove
with snap ring groove and snap ring
::
Table 1.2 Metric Series Deep Groove Ball Bearings (Standard Series)
Basic Number
WF53
ー16 96 8
ZZZZ
NR M3M2
MGY SST
P5P0SRKN
single-shielded, dual-shielded
single-shielded, dual-shielded (with stop ring)
single-sealed, dual-sealed (contact type)
single-sealed, dual-sealed (extremely light contact type)
single-sealed, dual-sealed (non-contact type)
single-sealed, dual-sealed (resin non-contact type)
No code
WF
FN
standard type
wide type
outer ring with flange
outer ring with resin flange
::::
Bearing type code
Bearing series code
Bore diameter number
Specific item code
Shield/seal code
Bearing ring form code
Tolerance code
1. Bearing Types and Features
Supplementary Code
nominal bearing bore diameter:
Material code
Clearance code
Cage code
PZ5P7P9P
Lubricant code
the bearing, such as bearing type, boundary dimensions,dimension accuracy, running accuracy, and internal clearance. It consists of a basic number and a supplementary code.
5
Miniature and Extra -small Ball Bearings
nominal bearing bore diameter 8 mm
nominal bearing bore diameter 4 mm
(Nominal bearing bore diameter ×10)
8040
WOB,EE
::
Table 1.4 Inch Series Deep Groove Ball Bearings
Table 1.3 Metric Series Deep Groove Ball Bearings (Specific Dimension Series)
MLWML
1408FN
8040 ー1 ZZ
NR M3M3
Y SMG
STST
P0P5 KN
::
OBEE
881S ー3
ZZXZZ NR
M3M3
STST
MGYS
P05P
SRKN
FFN::
MLWML
standard widthwide type::
F
Dimension series code
F FN
::
W
(Nominal bearing outside diameter)
1408
nominal bearing outside diameter 14 mm
nominal bearing outside diameter 8 mm
::
In addition to JIS designation, KOYO uses supplementarycodes, for ease of understanding of bearing specifications. The designation structure is shown in Tables 1.2 to 1.4.
In general, boundary dimensions of bearings conform toJIS B 1512 (Boundary Dimensions for Rolling Bearings). Designation of such standard bearings is specified by JISB 1513 (Designation of Rolling Bearings).
Basic Number Supplementary Code
Bearing type code
Bore diameter number
Flange code
Outside diameter number
outer ring with flange
outer ring with resin flange
Basic Number Supplementary Code
wide type
standard type
Bearing type code Flange code
outer ring with flange
outer ring with resin flange
(See bearing dimension tables)
( For descriptions of supplementary codes, see Table 1.2 on page 4 )
( For descriptions of supplementary codes, see Table 1.2 on page 4 )
6
In general, a ribbon type or crown type cage made of steelis used in miniature and extra-small ball bearings. The ribbon type cage is used in relatively large bearings,while the crown type is used in smaller ones.
Molded polyamide resin cages are becoming increasinglypopular, as they are advantageous in terms of running torque,grease life, and noise.
The T-molded cage is designed to perform similarly to thatof the single-shielded type bearing.
Table 1.5 shows types, codes, and names of cages used inminiature and extra-small ball bearings.
Table 1.5 Cage Types, Codes, and Names
Cage Type Code Name
YS
/ /Ribbon type cage
1.3 Cages
Crown type cage
Molded reinforced polyamideresin cage
Molded heat-resistant rein-forced polyamide resin cage
T-molded reinforcedpolyamide resin cage
YS
MG
MG
1. Bearing Types and Features
2. Bearing Life and Load Rating
2.1 Bearing Life
When a bearing rotates under a load, the raceway surfacesof the inner and outer rings and the rolling contact surfacesof the rolling elements are constantly subjected to repetitiveloading. Even under proper operating conditions this results in scale-like damage (known as flaking) on the surfaces of the race-way or surfaces of the rolling elements due to materialfatigue. The total number of rotations reached prior to this damageis known as " the (fatigue) life " of a bearing.
Substantial variations in fatigue life occur even if bearingsof the same structure, dimensions, materials, machiningmethod, etc. are operated under identical conditions. This variation in fatigue life, an intrinsic phenomenon to thematerial, is being studied.
The total number of rotations at which 90 % of the samebearings operated individually under the same conditionsshould be free of damage caused by rolling fatigue (in otherwords, bearing life of 90 % reliability), is referred to as "thebasic rating life." If bearings are operated at a constant rate, the basic ratinglife is expressed in total running hours.
In miniature and extra-small ball bearings, it is rare thatfatigue life becomes an issue of concern. Factors affecting the service life of such bearings are thedecline of bearing performance and deterioration of lubricant,which appear before flaking occurs.
Specifically, bearings used for audio and office automationequipment and aircraft instruments are required to offer ahigh level of noise, vibration, and frictional torque perfor-mance. Practical bearing life ends when a bearing becomesincapable of meeting its performance requirements.
FG
7.
8.
7
Miniature and Extra -small Ball Bearings
where,
:
:
:
:
:
:
basic rating life, 106 rotations
basic rating life, h
dynamic equivalent load, N…(See page 9)
basic dynamic load rating, N
p=3 for ball bearings
rotation speed, minー1
2.2 Calculation of Bearing Life
2.2.1 Basic Dynamic Load Rating The strength of a bearing against rolling fatigue--that is, thebasic dynamic load rating representing the load-bearing ca-pacity--is the net constant radial load (in the case of a radialbearing) that a bearing, with either the inner/outer ring sta-tionary and the other rotating, can endure for a rating life of 1million rotations. This is known as "the basic dynamic radial load rating (C r )." Its values are given in the bearing dimension tables.
2.2.2 Basic Rating Life The relationship among the basic dynamic load rating, thedynamic equivalent load, and the basic rating life, is expressedby Equation (2.1). If a bearing is to be operated at a constant rotation speed,its life is conveniently expressed in hours as determined byEquation (2.2).
…………………
……………
Total numberof rotations (2.1)
(2.2)
L 10
L 10h
=
= 60n106( )P
C p
( )PC p
………………………………(2.4)
……………………(2.5)
……………(2.6)
L 10h = 500 f n3
Life factor
Speed factor
Ball bearings
When a bearing is operated under a dynamic equivalentload P and rotation speed n, the basic dynamic load rating Cof the bearing, which is adequate for meeting the design life,is given by Equation (2.3). Thus, the dimensions of the bearing are determined by se-lecting a bearing from the bearing dimension tables, whichmeets the required dynamic load rating C.
L 10
L 10h
P
Cp
n
C = P …………………(2.3)60n106( )
1/3
L 10h ×
Reference
:
:
f h
f n
=
=
= ( 0.03n )ー1/3
500×60n106( )
1/3
f n PC
Values of f n , f h , and L 10h are determined approximately bynomograms as shown in Fig. 2.1.
Fig. 2.1 Rotation Speed ( n ) vs. Speed Factor ( f n ) and Life Factor ( f h ) vs. Life ( L 10h )
( p=10/3 for roller bearings)
The formula below is derived from Equation (2.2) by apply-ing a life factor ( f h ) and speed factor ( f n ).
Rotation speed
Life
fn
n
fh
10h
1.5 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.35 0.3
6.05.04.03.53.02.52.01.51.00.90.80.70.6
100 200 300 400 500 700 1 000 2 000 3 000 5 000 10 000 20 000 30 000 50 000 100 000
0.25 0.2 0.19 0.18 0.17 0.16 0.15
10 20 30 40 50 70 100 200 300 500 1 000 2 000 3 000 5 000 10 000
L
Hours
8
L na ……………………(2.7)= a1 a2 a3 L 10
125
1
150
1
175
0.95
200
0.90
250
0.75
S0
S1
S2
a1
a2
a3
Table 2.3 Reliability Factor, a1
Reliability,% L na a1
90
95
96
97
98
99
L10aL 5aL 4a
L 3aL 2aL 1a
1
0.62
0.53
0.44
0.33
0.21
2.2.3 Temperature Corrections for Basic Dynamic Load Ratings When bearings are operated at high temperatures, theirhardness decreases, and their material structure changes. This results in a lower basic dynamic load rating than thatdetermined by use at normal temperature. Once the material structure has changed, it does not re-cover even if the temperature returns to normal. Accordingly, the basic dynamic load ratings indicated inthe bearing dimension tables must be corrected by multiply-ing by a temperature factor shown in Table 2.1.
2. Bearing Life and Load Rating
Table 2.1 Temperature Factor Values
BearingTemperature,
TemperatureFactor
When a bearing which has undergone ordinary heat treat-ment is operated at 120 ℃or higher for an extended period oftime, a substantial dimensional change occurs.
There are bearings that have been subjected to dimensionstabilizing treatment, whose codes and operating tempera-ture ranges are shown in Table 2.2. The hardness of such bearings, however, is low, so in somecases their basic dynamic load ratings may decrease.
Table 2.2 Bearing Dimension Stabilizing Treatment
Operating Temperature Range
Over 100 ℃, up to 150 ℃
Over 150 ℃, up to 200 ℃
Over 200 ℃, up to 250 ℃
Dimension StabilizingTreatment Code
The basic rating life (L 10) expressed by Equation (2.1) isthe (fatigue) life with 90 % reliability. In some applications, the reliability should be higher than90 % for calculating bearing life. Bearing life may be ex-tended by adopting specific materials. In addition, operatingconditions such as lubrication may affect bearing life.
The basic rating life is corrected by taking these conditionsinto consideration. Such bearing life is known as the cor-rected rating life, which is determined by Equation (2.7).
2.2.4 Corrected Rating Life
[Note] When determining bearing dimensions using an L nain which the reliability exceeds 90 %, considerationshould be given to the design and strength of the shaftand housing
where,
:
:
:
:
:
corrected rating life, 106 rotations
basic rating life, 106 rotations (90 % reliability)
reliability factor
bearing characteristic factor
operating condition factor
…………………See(1)
………See(2)
………See(3)
Bearing life at (100 - n ) % reliability--namely,breakage probability n %--considering bearingcharacteristics and operating conditions
L na
L 10
Table 2.3 shows a 1 values used to determine the correctedrating life at reliabilities of 90 % or higher (10 % or less forbreakage probability).
(1) Reliability factor, a 1
℃
9
Miniature and Extra -small Ball Bearings
dynamic equivalent load, N
radial load, N
axial load, N
basic static load rating, N
constant
radial load factor (See Table 2.4)
axial load factor (See Table 2.4)
0.014
0.028
0.056
0.084
0.11
0.17
0.28
0.42
0.56
0.19
0.22
0.26
0.28
0.30
0.34
0.38
0.42
0.44
2.30
1.99
1.71
1.55
1.45
1.31
1.15
1.04
1.00
1
0
0.56
F aC 0
eX Y X Y
≦ e > e
Table 2.4 Radial and Axial Load Factors of Deep Groove Ball Bearings
F aF r
F aF r
(2) Bearing characteristic factor, a2 The bearing characteristic variables pertaining to servicelife are bearing material (steel type and quality), manufactur-ing process, and design. a2 is used for correction in such cases.
KOYO's standard material is a high-quality vacuum de-gassed bearing steel. The results of our tests show it to havesubstantial extended bearing life. The basic load ratings of this material are indicated in thebearing dimension table, where the bearing characteristic fac-tor is : a2 = 1.
For bearings using a specific material aimed at extendingfatigue life, the value of a2 can be greater than 1.
(3) Operating conditions factor, a 3 a3 is used for correction where a bearing operating condi-tion has a direct influence on bearing life (especially, the ad-equacy of lubrication).
When lubrication is normal, a3 = 1. a3 can be greater than1 if the lubrication is especially good.
a3 < 1 under the conditions below.
● Lubricant during operation has low kinematic viscosity Ball bearings ...... 13 mm2/s{13 cSt} max. Roller bearings ... 20 mm2/s{20 cSt} max. ● Use at a very low rotation speed, where the product of pitch diameter of ball set and rotation speed (dmn ) is 10 000 or smaller ● Foreign matter enters lubricant ● Inner and outer rings incline considerably
If the hardness of a bearing decreases during op-eration at high temperatures, a correction to the basicdynamic load rating is required (see Table 2.1 on page8)
[Note]
[Remark] a2× a3 may not be greater than 1 when lubricationis in adequate, even if a 2 > 1 owing to the use of aspecific material. Consequently, in general, a2 ≦ 1 ifa 3 < 1
Since it is not easy to view a2 and a3 as indepen-dent factors, they are treated in some cases as a singlefactor, a23
Bearings are used under different conditions. For example,they are often subjected to a resultant load consisting of ra-dial and axial loads, with their magnitudes being variable.
For convenience, a load of a constant magnitude and di-rection applied to the bearing center, is considered, whichwould make the bearing life equal to that resultant from anactual load and rotation speed. This calculated virtual load is used to estimate bearing life,which is known as the dynamic equivalent load ( P ).
The dynamic equivalent load of a radial bearing receiving aresultant load constant in magnitude and direction is obtainedby Equation (2.8).
2.3 Dynamic Equivalent Load
…………………(2.8)P = X F r + Y F a
where,
:
:
:
:
:
:
:
P
F r
F a
C 0
e
X
Y
For radial bearings,P r:dynamic equivalent radial load
10
………
………
……
Operating Condition f s
BallBearing
Roller Bearing(Reference)
2
1
1.5
3
1.5
3
2.4.1 Basic Static Load Rating Under an excessive static load or with an impact load atvery low rotation speed, bearings can experience local per-manent deformation of the contact surfaces between the roll-ing elements and raceways. The magnitude of this permanent deformation increasesas the load becomes greater. This will eventually impair thebearings ability to operate smoothly.
The basic static load rating refers to the static load corre-sponding to the following calculated contact stress, which isworking at the center of contact between the rolling elementand raceway where the maximum load is applied.
2. Bearing Life and Load Rating
2.4 Basic Static Load Rating and Static Equivalent Load
The total permanent deformation of the rolling element andraceway occurring under such contact stress as indicatedabove is approximately 0.000 1 times the diameter of the roll-ing element.
The static load rating of radial bearings is known as thebasic static radial load rating(C 0 r). Its values are shown inthe bearing dimension tables.
2.4.2 Static Equivalent Load The static equivalent load is also a calculated virtual load. The magnitude of this load is determined through conver-sion, such that the load would produce a contact stress equalto that produced under actual loading conditions, occurringat the center of contact between the rolling element and race-way under maximum load while the bearing is at rest or rotat-ing at a very low rate.
For radial bearings, the radial load working at the bearingcenter is employed, which is referred to as the static equiva-lent radial load (P 0 r).
The static equivalent load is obtained by Equations (2.9)and (2.10).
Deep grooveball bearings
Self-aligningball bearings
Roller bearings
[Radial bearing] ... The larger of the values determined by the following two equations is adopted.
X0 F r +Y 0 F a
F r
……………
…………………………
(2. 9)
(2.10)
=
=
P 0 r
P 0 r
static equivalent radial load, N
radial load, N
axial load, N
static radial load factor (0.6)
static axial load factor (0.5)
:
:
:
:
:
P 0 r
F r
F a
X 0
Y 0
where,
2.4.3 Safety Factor The permissible static equivalent load is determined by thebasic static load rating of the bearing. The operating limits of a bearing with permanent deforma-tion (local dent) as described in the preceding section de-pends on the bearing's performance requirements and oper-ating conditions.
To estimate the degree of safety ensured for a basic staticload rating, a safety factor is determined through experience.
safety factor (See Table 2.5)
basic static load rating, N
static equivalent load, N
:
:
:
f s
C 0
P 0
where,
f s = ………………………(2.11)P 0
C 0
Table 2.5 Values of Safety Factor f s
High running accuracy required
Ordinary operating condition
Impact load involved
(min.)
・
・
・
4 200 MPa
4 600 MPa
4 000 MPa
11
Miniature and Extra -small Ball Bearings
3. Bearing Tolerances
Table 3.1 Tolerance Classes Selection Standardfor Miniature and Extra-small Ball Bearings
Application Tolerance Class
Precision motors
Magnetic disc spindle motors
VTR cylinder motors
Polygon mirror scanner motors
Printers
Copying machines
Pinch rollers
Stepping motors
Electric power tools
ABS motors
Electric fan motors
Small motors
Axial flow fan motors
Floppy disk drive motors
Tape guide motors
Rotary encoders
Servo motors
Synchro motors
Cleaner motors
Dental hand piece
Magnetic disc drive pivot
Classes 0 and 6
The main factor to consider when selecting the bearing tol-erances is application. Table 3.1 shows standards used to select the tolerances ofminiature and extra-small ball bearings. Use this table as areference when determining the required bearing tolerances.
The tolerance classes of miniature and extra-small ball bear-ings are specified in JIS B 1514 (Tolerances for Rolling Bear-ings) (JIS is based on ISO standards). The tolerance classes of inch series deep groove ball bear-ings conform to ABMA standards.
The tolerance classes for these bearings are as follows:
Table 3.2 shows the limits for chamfer dimensions andTables 3.3 to 3.5 show bearing tolerances of miniature andextra-small ball bearings .
JIS
ISO
ANSI
ABMA
Japanese Industrial Standards
International Organization for Standardization
American National Standards Institute, Inc.
American Bearing Manufactures Association
Reference: Standards and Organizations Related to Bearings
:
:
:
:
・Metric series deep groove ball bearingsJIS Classes 0, 6, 5, 4, and 2
・Inch series deep groove ball bearingsABMA Standard 5P, 7P, and 9P
Table 3.2 Permissible Values for Chamfer Dimensions ( Radial Bearing ) = JIS B 1514 =
Value of rmax or r1max in the axial direction of bearings with nominal width lower than 2 mm shall be the same as the value in radialdirectionThere shall be no specification for the accuracy of the shape of the chamfer surface, but its outline in the axial plane shall not besituated outside of the imaginary circle arc with a radius of rmin or r1min which contacts the inner ring side face and bore, or the outerring side face and outside surface
A
A
A
B
B
B
Axial direction
Bore or outsidesurface
Radial direction
Inner or outer ringside face
rmin or r
1min
rmin or r1min:rmax or r1max:〔 〕
Remarks: l .
2.
Radial Direction
0.1
0.16
0.2
0.3
0.5
0.6
1
0.2
0.3
0.4
0.6
0.8
1
2
0.05
0.08
0.1
0.15
0.2
0.3
0.6
Axial Direction
rmax or r1 maxrmin or r1 min
Unit mm
Classes 5 and 4ABMA 5P and 7P
Classes 4 and 2ABMA 7P and 9P
12
ーー 250 ーー 250
ー 250
ー 250
ー 250
ー 40 ー 120ー 40 ー 120
ー 40
ー 40
ー 40
10
5 6
4
2.5
1.5
ー
ー
7
3
1.5
(2) Inner ring (running accuracy and width)
2.510 2.510 2.510 2.510 2.510
0.6 1) 2.5 0.6 1) 2.5 0.6 1) 2.5 0.6 1) 2.5 0.6 1) 2.5
Inner ringwidth
variation
0000
0
0
0
Single inner ring width deviation
⊿B s
ー
ー
7
3
1.5
Radial runoutof assembled
bearinginner ringK ia
Facerunout
with bore
Facerunout
withracewayS ia
Single row bearingBearing for paired orstacked mounting 3)
ー0ー0
0
0
0
12151215
5
2.5
1.5
Table 3.3 (1) Tolerances for Metric Series Deep Groove Ball Bearings -- Inner Rings--
(1) Inner ring (bore diameter)
0
0
0
0
0
ー 8
ー 7
ー 5
ー 4
ー 2.5
ー
ー
ー
0
0
ー
ー
ー
ー 4 2)
ー 2.5
2.510 2.510 2.510 2.510 2.510
0.6 1) 2.5 0.6 1) 2.5 0.6 1) 2.5 0.6 1) 2.5 0.6 1) 2.5
10
9
5
4
ー
Nominal borediameter
d(mm)
Single plane meanbore diameter
deviation
⊿dmp
Single borediameter deviation
⊿dsClass
over
Class 0
Class 6
Class 5
Class 4
Class 2
lower max.upper
8
7
6
5
6
5
3
2
1.5
7,8,9 2,3,40,1
4
3
2.5
Diameter series
VdpMean borediametervariation
Vdmp
Single radial plane borediameter variation
B
B
φD
D
φd
B
φD φd
d��:�:�:�
nominal bearing bore diameternominal bearing outside diameternominal bearing width
��
up to lowerupper max. max. max.
Nominal borediameter
d(mm)
Class
over lowermax. upperup to loweruppermax. max. max.
Class 0
Class 6
Class 5
Class 4
Class 2
Notes: 1) In this dimension classification, 0.6 mm is included 2) Applicable to bearings of diameter series 0, 1, 2, 3, and 4 3) Applicable to individual bearing rings fabricated for paired or stacked mounting
Unit μm
3. Bearing Tolerances
Remarks:
1. The upper tolerances for the bore diameters of cylindrical bore bearings specified in this table do not apply to the area from the bearings ring side face through 1.2 times the maximum permissible chamfer dimension rmax
2. According to revised ANSI / ABMA std 20, ABEC 1, 3, 5, 7, and 9 correspond to Classes 0, 6, 5, 4, and 2, respectively
Unit μm
VB sS d
Miniature and Extra -small Ball Bearings
13
1515 8 9 5 6 3 41.52.5
2.5 1) 18 2.5 1) 18 2.5 1) 18 2.5 1) 18 2.5 1) 18
VC s
ーーーー88441.51.5
ーーーー88551.52.5
552.52.51.51.5
2.5 1)18
2.5 1)18
2.5 1)18 2.5 1)18 2.5 1)18
18301830183018301830
ー 8ー 9ー 7ー 8ー 5ー 6ー 4ー 5ー 2.5ー 4
0000000000
6756
10129105645ーー
8978
10 4)12 4)
910ーーーーーー
ーーーーーー
ー 4 ー 5 ー 2.5 ー 4
ーーーーーー0000
VDp 3)
7,8,9 2,3,40,1
Open type Shielded /sealed type
0,1,2,3,4
67563322.51.52
45342.54
VDmp 3)
B
B
φD
D
φd
B
φD φd
d��:�:�:�
nominal bearing bore diameternominal bearing outside diameternominal bearing width
��
(2) Outer ring (running accuracy and width)
Outer ring widthvariation
Deviation of asingle outer ring
width
Radial runout ofassembled
bearing outer ring
Kea
Variation of outsidesurface generatrix
inclination with face SD 5)
Assembled bearingouter ring face runout
with raceway Sea 5)
Table 3.3 (2) Tolerances for Metric Series Deep Groove Ball Bearings --Outer Rings--
(1) Outer ring (outside diameter)
Nominal outsidediameter
Single plane meanoutside diameter
deviation
Single outsidediameterdeviation
Class
over
Class 0
Class 6
Class 5
Class 4
Class 2
lower max.upper
Diameter series
Meanoutside
diametervariation
Single radial plane outsidediameter variation
up to lowerupper max. max. max.
Nominal outsidediameterD
(mm)Class
over lowermax. uppermax. max.
Class 0
Class 6
Class 5
Class 4
Class 2
Diameter series
max.
Refer to the tolerancefor VBs, with d beingthat of the same bearingRefer to the tol-
erance for ⊿Bs ,with d being thatof the same bear-ing
max.
⊿Cs
1) In this dimension classification, 2.5 mm is included2) Applicable to bearings of diameter series 0, 1, 2, 3, and 43) Applicable where no locating snap ring is fitted4) Applicable to bearings of diameter series 2, 3, and 45) Not applicable to flanged bearings
Notes:
Remarks:1. The lower tolerances for the outside diameters of the bearings specified in this table do not apply to the area from the side face of bearings ring through 1.2 times the maximum permissible chamfer dimension rmax
2. According to revised ANSI / ABMA std 20, ABEC 1, 3, 5, 7, and 9 correspond to Classes 0, 6, 5, 4, and 2, respectively
Unit μm
Unit μm
D(mm) ⊿Dmp ⊿Ds 2)
up to
18301830183018301830
14
18301830183018301830
2.5 1) 18 2.5 1) 18 2.5 1) 18 2.5 1) 18 2.5 1) 18
5 5 2.5 2.51.51.5
ーーーー88441.51.5
ーーーー11117734
(2) Tolerances for flange width, and running accuracy related to the flange
⊿C1s SD1VC1s Sea1
ー 36ー 43ー 52
10
18
30
ー 36ー 43ー 52
+ 220
+ 270
+ 330
Single flange outside diameter deviation
Field 1 Field 2
0
0
0
10
18
⊿D 1s
1��
1��
φD φD
1��1��
C
CDD:�:�:�
nominal bearing outside diameternominal flange outside diameternominal flange width
Table 3.4 Tolerances for Flanges of Flanged Deep Groove Ball Bearings
(1) Tolerance for flange outside diameter
Nominal flangeoutside diameterD 1(mm)
over up to upper lower upper lower
1. Field 2 is applicable when the outside surface of the flange is used for positioning2. For the tolerance of deep groove ball bearings with resin flanges (FN bearings), see the bearing dimen- sion table
Remarks:
Nominal outsidediameterD
(mm)Class
over lowerupperup to
Class 0
Class 6
Class 5
Class 4
Class 2
Refer to the tolerancefor ⊿Bs of the sameclass, with d being thatof the same bearing
max. max. max.
Refer to the tolerancefor VBs of the sameclass, with d being thatof the same bearing
Single flange widthdeviation
Flange widthvariation
Variation of outside surfacegeneratrix inclination with
flange back face
Flange back facerunout with
raceway
1) In this dimension classification, 2.5 mm is included
Tolerances specified in this table are not applicable to deep groove ball bearingswith resin flanges (FN bearings)
Note:
Remark:
3. Bearing Tolerances
Unit μm
Unit μm
Miniature and Extra -small Ball Bearings
15
Table 3.5 (1) Tolerances for Inch Series Deep Groove Ball Bearings -- Inner Rings--
(1) Inner ring (bore diameter) d ≦10 mm
Table 3.5 (2) Tolerances for Inch Series Deep Groove Ball Bearings --Outer Rings--
(1) Outer ring (outside diameter)
(2) Inner ring (running accuracy and width)
5.1
3.8
1.32.5
ー18ー18ー18
183018301830
7.6
5.1
1.32.5
7.6
3.8
1.3
0
0
0
ー 25.4
ー 25.4
ー 25.4
5.1
2.5
1.3
0
0
ー
ー 25.4
ー 25.4
ー
ー 50.8
ー 50.8
ー
0
0
ー
5.1
2.5
ー
7.6
5.1
ー
ー18ー18ー18
183018301830
ー 6.1
ー 6.1
ー
+ 1
+ 1
ー
5.1
5.1
ー
5.1
5.1
ー
0
0
00
ー 5.1
ー 5.1
ー 2.5ー 3.8
0
0
00
ー 5.1
ー 5.1
ー 2.5ー 3.8
2.5
2.5
1.32
2.5
2.5
1.32
(2) Outer ring (running accuracy, width and flange tolerances)
VDmp⊿Ds VDp
ABMA 5P
ABMA 7P
ABMA 9P
D(mm) ⊿C1s VC1⊿D1s
With outer ring flange
ABMA 5P
ABMA 7P
ABMA 9P
D(mm) ⊿Dmp
Shielded / sealed typeOpen type
VDmp⊿Ds VDp
S ea1Kea SD Sea
⊿Cs
VCs
d ≦10 mm
Class
lower max.upper lowerupper max.
Single plane mean borediameter deviation
Single bore diameterdeviation
Single radial plane borediameter variation
Mean bore diametervariation
Class
lowermax. upper
Class
lower max.upper
Class
lower max.upper
3.8
2.5
1.3
5.1
2.5
1.3
ー 25.4
ー 25.4
ー 25.4
7.6
2.5
1.3
7.6
2.5
1.3
0
0
0
⊿Bs
ABMA 5P
ABMA 7P
ABMA 9P
K ia S d S ia VBs
2.5
2.5
1.3
2.5
2.5
1.3
ー 5.1
ー 5.1
ー 2.5
ー 5.1
ー 5.1
ー 2.5
0
0
0
0
0
0
Vdmp⊿ds Vdp
ABMA 5P
ABMA 7P
ABMA 9P
⊿dmp
max.max. max.
Radial runout ofassembled
bearing inner ring
over up to lowerupper loweruppermax. max.max.
Face runoutwith bore
Face runoutwith raceway
Single inner ring widthdeviation
Single row bearing
Inner ring widthvariation
max.max.max.max.max.over up to lowerupper lowerupper
Single plane meanoutside diameter
deviation
Nominal outsidediameter Single outside
diameterdeviation
Single radial planeoutside diameter
variation
Mean outsidediametervariation
Single flangeoutside
diameterdeviation
Radialrunout ofassembled
bearingouter ring
Assembledbearing
outer ringface runout
with raceway
Outerring
widthvaria-tion
Flangeback facerunout withraceway
Flangewidth
variation
Single flangewidth
deviation
Variationof outsidesurface
generatrixinclinationwith face Single row
bearing
Deviation of asingle outerring width
Unit μm
Unit μm
Unit μm
Unit μm
Single outsidediameterdeviation
Single radial planeoutside diameter
variation
Mean outsidediametervariation
Nominal outsidediameter
16
na = f 1 ・ f 2 ・ n …………… (4.1)
:
:
:
:
:
:
:
:
F rF a( )C
P
na
f 1
f 2
n
C
P
F r
F a
f 1
f 2
0.54 5 6 7 8 9 10 11 12 13 14 15
0.6
0.7
0.8
0.9
1.0
1.0
0.9
0.8
0.7
0.5 1.0 1.5 2.00.60
The rotation speed of a bearing is restricted chiefly by tem-perature increases caused by frictional heat generated in thebearing. When the speed limit is reached, it becomes impos-sible to continue operation due to seizure and the like.
The limit on rotation speed of a bearing represents the maxi-mum value at which the bearing can continue operation with-out generating seizure-causing heat. Accordingly, the rotation speed limit differs with each bear-ing type, dimensions, and accuracy, as well as with lubrica-tion methods, quality and quantity of lubricant, cage material,loading conditions, etc.
The rotation speed limit for grease lubrication or oil (oil bath)lubrication of each bearing is given in the dimension table. These values are applicable in cases where a bearing of astandard design is operated under normal loading conditions(C /P ≧13, F a /F r ≦ approx. 0.25 ).
4. Rotation Speed Limit
4. Rotation Speed Limit
: basic dynamic load rating
: dynamic equivalent load
: radial load
: axial load
The classes and brands of some lubricants may not besuitable for high-speed operation even if they are excellentin other features. Consult KOYO if the rotation speed of a bearing exceeds80 % of the catalog value.
4.1 Correction of the Rotation Speed Limit
Under some loading conditions, the rotation speed limitneeds to be corrected by Equation (4.1). Such conditions include cases where C /P <13 (namely,the dynamic equivalent load P is equal to or greater thanapproximately 8 % of the basic dynamic load rating C ), and incombined loading applications where the axial load exceeds25 % of the radial load.
where,
corrected rotation speed limit, minー1
correction factor determined from
the load magnitude (See Fig. 4.1)
correction factor determined from
combined load (See Fig. 4.2)
rotation speed limit under normal load condition
(listed in the bearing dimension table), minー1
basic dynamic load rating, N
dynamic equivalent load, N
radial load, N
axial load, N
CP
(basic dynamic load rating)
(dynamic equivalent load)
Fig. 4.1 Values of the Correction Factor f 1 Determined by Load Magnitude
Fig. 4.2 Values of the Correction Factor f 2
Determined by Combined Load
The rotation speed limit for a deep groove ball bearing withcontact seals is limited by the rubbing speed of the portion incontact with the seal. This allowable rubbing speed varies according to the rub-ber material of the seal. In KOYO's deep groove ball bearings with standard RS typecontact seals (nitrile rubber), 15 m/s is used.
The rotation speed limit for individual deep groove ball bear-ings with seals is given in the relevant bearing dimension table.
4.2 Rotation Speed Limit for Sealed Deep Groove Ball Bearings
F aF r
(axial load)
(radial load)
17
Miniature and Extra -small Ball Bearings
In general, light interference fits or slight clearance fits areused for miniature and extra-small ball bearings. Fits of con-siderable interference or clearance can be detrimental.
Selective fitting is recommended if it is possible to selectshafts and housings with bearings classified according to boreand outside diameters. Selective fitting helps narrow down the range of fits so thatbearing performance can be effectively improved.
5. Bearing Fits
In miniature and extra-small ball bearings, housings madeof non-ferrous metal such as an aluminum alloy are frequentlyused. In applications with wide temperature ranges, the hous-ings should be fitted with a steel liner. At low temperatures, the steel liner prevents housing shrink-age and at high temperatures, it minimizes expansion.
Table 5.1 shows fits for tolerance miniature and extra-smallball bearings.
ー 5.1
ー 5
ー 5.1
ー 4
ー 5.1
ー 5
ー 5.1
ー 4
ー 5.1
ー 4
ー 5.1
ー 5
ー 5.1
ー 4
ABMA 5P
JIS Class 5
ABMA 7P
JIS Class 4
ABMA 5P
JIS Class 5
ABMA 7P
JIS Class 4
ABMA 7P
JIS Class 4
ABMA 5P
JIS Class 5
ABMA 7P
JIS Class 4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7.6T
7.5T
7.6T
6.5T
2.6T
2.5T
2.6T
1.5T
ー
2.6T
2.5T
2.6T
1.5T
2.5L
2.5L
2.5L
2.5L
7.5L
7.5L
7.5L
7.5L
1 L
7.5L
7.5L
7.5L
7.5L
Table 5.1 Fits for Precision Miniature and Extra-small Ball Bearings (JIS Classes 5 and 4, ABMA 5P and 7P)
Note: 1) Symbol T denotes interference, and L, clearance
ー 2.5
ー 2.5
ー 7.5
ー 7.5
ー 6
ー 5
ー 7.5
ー 7.5
+ 2.5
+ 2.5
ー 2.5
ー 2.5
ー 1
ー 1
ー 2.5
ー 2.5
Lightinterferencefit
Slightclearancefit
Slightclearancefit
Selective fitrequired
Operating Condition PrincipalApplication
Fit
Medium /high speed
Light /mediumload
Low speed
Light load
Medium /high speed
Light load
Low to highspeed
Light load
Inner ring rotation
Outer ring rotation
Cleanermotors
Electricpower tools
Encoders
Synchronizedinstruments
Servo motors
Floppy diskdrive spindles
VTR cylindermotorsPolygon mirrorscanner motors
Magnetic discdrive spindles
Pinch rollers
Tape guiderollers
BearingClass
Single planemean borediameterdeviation
upper lower
Shaftdiameter
dimensionaltolerance
Fit 1)
(1) Fit on shaft ( d < 10 mm )
⊿dmp
lower upper
Unit μm
18
(2) Fit in housing ( D ≦ 30 mm )
Notes: 1) Symbol T denotes interference, and L, clearance 2) The figures for the upper and lower rows in the fields indicating the tolerances for the bearing outside diameter and fit for JIS Classes 5 and 4, are applicable in cases where D ≦ 18 mm and 18 <D ≦ 30 mm, respectively
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
ー 5.1
ー 5
ー 6
ー 4
ー 5
ー 5.1
ー 5
ー 6
ー 4
ー 5
ー 5.1
ー 4
ー 5
ー 4
ー 5
ー 5.1
ー 5
ー 6
ー 4
ー 5
0
0
0
0
0
2.5T
2.5T
2.5T
2.5T
2.5T
0
0
0
5 T
5 T
2.5T
2.5T
2.5T
2.5T
2.5T
10.1L
10 L
11 L
9 L
10 L
7.6L
7.5L
8.5L
6.5L
7.5L
8.1L
7 L
8 L
2 L
3 L
7.6L
7.5L
8.5L
6.5L
7.5L
0
0
0
ー 2.5
ー 2.5
ー 2.5
0
0
ー 5
ー2.5
ー 2.5
ー 2.5
+ 5
+ 5
+ 5
+ 2.5
+ 2.5
+ 2.5
+ 3
+ 3
ー 2
+ 2.5
+ 2.5
+ 2.5
Clearance fit
Slightclearance fit
Operating ConditionPrincipal
Application Fit
Medium /high speed
Light /medium load
Low speed
Light load
Medium /high speed
Light load
Low to highspeed
Light load
Inner ring rotation
Outer ring rotation
Cleanermotors
Electricpower tools
Encoders
Synchronizedinstruments
Servo motors
Floppy diskdrive spindles
Polygon mirrorscanner motors
Magnetic discdrive spindles
Pinch rollers
Tape guiderollers
BearingClass
Single planemean outsidediameterdeviation Fit 1)
upper lower
Housing borediameter
dimensionaltolerance
ABMA 5P
ABMA 7P
JIS Class 5 2)
JIS Class 4 2)
ABMA 5P
ABMA 7P
JIS Class 5 2)
JIS Class 4 2)
ABMA 7P
JIS Class 4 2)
JIS Class 4 2)
ABMA 5P
ABMA 7P
JIS Class 5 2)
JIS Class 4 2)
VTR cylindermotors
⊿ Dmpupper lower
Slightclearance fit
Slight snug fit
Slightclearance fit
5. Bearing Fits
Unit μm
19
Miniature and Extra -small Ball Bearings
6. Bearing Internal Clearance
The internal clearance of a bearing refers to the amount ofmovement of the inner ring, while the outer ring remains sta-tionary, or vice versa.
Movement in the radial direction reveals a radial internalclearance, while movement in the axial direction shows anaxial internal clearance (see Fig. 6.1).
In measuring internal clearances of bearings, a specifiedmeasuring load is generally applied to obtain stable measure-ments. Accordingly, measurements taken this way are greater thanthe true clearance due to elastic deformation resulting fromthe measuring load. In general, bearing clearances are specified in true clear-ances.
The amount of internal clearance during operation (knownas the running clearance) influences bearing performance-characteristics such as rolling life, heat generation, noise, andvibration.
Fig. 6.1 Bearing Internal Clearance
Tables 6.1 and 6.2 show radial internal clearances and se-lection standards for miniature and extra-small ball bearings.
The axial internal clearance is dependant on the ball size,curvature of raceways, and radial internal clearance. If the radial internal clearance is constant, the axial internalclearance becomes greater as the ball size and raceway cur-vature increase.
Figure 6.2 shows an example of the relationship betweenradial and axial internal clearance.
Fig. 6.2 Relationship between Radial and Axial Internal Clearance
Table 6.1 Radial Internal Clearances of Miniature and Extra-small Ball Bearings
Clearance Code M 1
0 5 3 8 5 10 8 13 13 20 20 28Clearance
Measured Load, NClearance Correction Value, μm
M 11
M 21
M 31
M 41
M 51
M 61
M 2 M 3 M 4 M 5 M 6
Remark: To convert to the measured clearances, add the correction value shown below
200
150
100
50
0 10 20 30
608625
606 , 684 , 693
695683 , 696
Radial internal clearance,
Axi
al in
tern
al c
lear
ance
,
Bearing number
ı
ı
0
Radial internal clearance Axial internal clearance
min. max. min. max. min. max. min. max. min. max. min. max.
Remark: Miniature ball bearings ... less than 9 mm in outside diameter Extra-small ball bearings ... 9 mm or more in outside diameter and less than 10 mm in bore diameter
Unit μm
2.3
20
Axial loading capacity andaxial rigidity are low
No interference is used forfitting
For light load and low-speed applications
VTR capstan motors
Precision gearinstruments
Servo mechanism
Equipment used atlow-speed
Axial flow fan motors
Magnetic disc drivespindles
Equipment used at lowor medium speed and atnormal temperatures
Cleaner motors
Magnetic disc pivots
Equipment used underhigh temperature andhigh-speed conditions
Adjust internal clearance
Preloading by a spring isrequired
Interference fit may beused
Adjust internal clearance
A non-interference fit isused, as a rule
Use under normal operat-ing load and speed con-ditions
Preloading by spring isrequired at medium speed
M 1
M 2
M 5
M 6
M 3
M 4
0~ 8
13~28
5~13
Ensure narrow clearancewithout clearance adjust-ment in axial direction
Frictional torque is not takeninto consideration
Neither durability nor rigid-ity for axial load is required
Normal frictional torque isaccepted for operation withaxial load
Carry out clearance adjust-ment in axial direction
Ordinary durability and rigid-ity are required for axial load
Under axial load, frictionaltorque should be reduced
Carry out clearance adjust-ment in axial direction
High durability against radi-cal changes in temperature
High durability and rigidityare required for axial load
Application ClearanceCode
RemarkRadial Internal
Clearance,μm
Bearing PerformanceRequirements
1.
2.
3.
6. Bearing Internal Clearance
Table 6.2 Selection Standards for Radial Internal Clearances of Miniature and Extra-small Ball Bearings
1.
2.
3.
1.
2.
3.
4.
1.
2.
3.
1.2.
3.
4.
1.
2.
3.
21
Miniature and Extra -small Ball Bearings
●
● To improve the positioning accuracy in the radial andaxial directions, and to improve the running accuracy,by minimizing runout● To prevent bearing noise caused by vibration and reso-nance
Table 7.1 Methods for Preloading
Fixed-position Preloading Constant-pressure Preloading
A method usingduplex bearings inwhich differences inwidth are precorrected(as shown below)
A method usinga spacer ofa precorrected size
A method using a coil springor conical spring
A method using a wavy washer
7. Preload of Bearings
[ ]Comparison between Fixed-position Preloadingand Constant-pressure Preloading
● Given the same preload force, fixed-position preloadingproduces smaller axial displacement. In other words,high rigidity is readily achieved by fixed-positionpreloading● In constant-pressure preloading, springs absorb loadvariations and volume changes of the shaft caused bythe temperature differentials between the shaft and hous-ing. Hence the preload force varies little and is stable● With fixed-position preloading a greater preload forcecan be realized
2δ�1δ�
Preload can be applied to prevent noise caused by vibra-tion. If, however, excessive preload is applied to a bearing,unusual heat, an increase in friction, and/or a reduction infatigue life may result. Accordingly, the chosen preload force should fall within arange that produces no adverse effect. In bearings for small motors, a wavy washer is generallyused to apply light preload.
A guide to preload forces for miniature and extra-small ballbearings is shown in Table 7.2.
Preload Preload Force Feature
Table 7.2 Preload Forces for Miniature and Extra- small Ball Bearings
Lightpreload
Mediumpreload
Heavypreload
1.0 % of C or less
1.5 % of C or less
2.0 % of C or less
Axial rigidity not required
Low torque is important
Both axial rigidity andlow torque are required
Axial rigidity is important
Rather high torque isacceptable
C : basic dynamic load rating of bearing, kN
7.1 Objective of Preload
In general, bearings are used with the proper internal clear-ance during operation. Some bearings for small motors are given a negative clear-ance by applying a preset axial load so as to minimize vibra-tion. This way of using bearings is known as preloading.
7.2 Methods for Preloading
Consequently, fixed-position preloading is suitable whenhigh rigidity is required. Constant-pressure preloading is ap-propriate for high-speed applications and the prevention ofaxial vibrations.
Preload is applied by fixed-position preloading or constant-pressure preloading. Typical examples of these methods areshown in Table 7.1.
7.3 Preload Force
● ● ●
22
In general, shielded and sealed bearings have a suitablequantity of lubricating grease ready packed, so they can beused in their original condition.
Normally, the quantity of sealed grease is approximately 30% of inner space of the bearing. If more grease is applied, the bearing torque will increasewhich may lead to a leakage of grease or an increase in heat. Therefore, care should be exercised in this regard.
Grease life depends on its ability to resist oxidation andheat the evaporation rate of the base oil. As bearing perfor-mance is greatly affected by the brand and type of greaseused, consult KOYO prior to selecting a grease.
Table 8.2 shows general-purpose lubricating greases usedin miniature and extra-small ball bearings. Lubricating greasesdeveloped by KOYO are shown in Table 8.3.
Table 8.1 Comparison of Grease and Oil Lubrication
・Sealing device
・Lubrication performance
・Rotation speed
OilGreaseItem
Simple
Good
Low / medium speed
Rather cumbersome
Relatively short
None
Difficult
・Replacement of lubricant
・Lubricant life
・Cooling effect
・Dust filtration
Simple
Long
Good (circulation required)
Simple
8. Bearing Lubrication
8.1 Objective of Lubrication and Methods
Lubrication is critical for bearings. The suitability of a lubri-cant and lubrication method greatly influences performanceand bearing life.
[ Functions of Lubrication ]
● Lubrication of each part of a bearing reduces frictionand wear● Removes heat generated in bearing by friction andother causes● Extends bearing life by constantly forming an appro-priate oil film between the rolling contact surfaces● Provides rust prevention and dust proofing
Bearing lubrication methods take advantage of either greaseor oil. Table 8.1 shows a general comparison of these methods.
Rather complicated(Care should be taken regarding maintenance)
Excellent
Suitable also for high speed applications
8.2 Grease Lubrication
Oil lubrication is superior to grease lubrication if it is neces-sary to reduce the starting or running torque to an extremelysmall value or if the load is very small and the rotation speedis high. Specifically, if a low torque is required in a low-speed appli-cation, bearings are run with a few drops of oil.
For high-temperature and high-speed applications, oil jetor oil mist lubrication is used. Oil mist lubrication is espe-cially effective in high-speed applications.
KOYO's standard lubricating oil is Aero Shell Fluid 12(MIL- L- 6085A).
8.3 Oil Lubrication
8. Bearing Lubrication
23
Miniature and Extra -small Ball Bearings
DroppingPoint,℃
OperatingTemperatureRange, ℃
Table 8.2 General - purpose Lubricating Greases
Table 8.3 Lubricating Greases Developed by KOYO
SR
AC
P2
B5
4M
BJ
Multemp SRL
Andok C
Multemp PS2
Beacon 325
SH44M
Barrierta JFE552
Kyodo Oil Lithium soap Ester oil 248
196
276
273
241
265
191
250 min.
198
194
224
250 min.
- 40~130
0~130
- 40~100
- 50~100
- 30~180
- 30~250
For wide tem-perature range
Code ApplicationBrand Manufacturer Thickener Base OilDropping
Point,℃
OperatingTemperatureRange, ℃
KN
K7
52
KV
VC
KNG 144
KNG 170
KAM 5
KVA
KVC
Diurea 247
245
267
332
285
186
- 30~130
- 40~150
- 30~140
- 40~100
- 40~150
Esso
Kyodo Oil
Esso
Dow CorningToray
NOK Cruba
Sodium soap
Lithium soap
Lithium soap
Lithium soap
Fluorinecompound
Mineral oil
Diester oilMineral oil
Diester oil
Silicone oil
Fluorinesynthetic oil
For low torque
For hightemperatures
For hightemperatures
For low torqueand low tem-peratures
For low torqueand low tem-peratures
Code ApplicationBrand Thickener Base Oil ApplicationExample
Diurea
Diurea
Lithium soap
Lithium soap
PolyalphaolefinMineral oil
Polyalphaolefin
Ester oil
Ester oilEtheral oil
PolyalphaolefinEster oil
250 min.
192
250 min.
260 min.
For wide tem-perature range
For high speedrotations andhigh temperatures
For low torqueand low noise
General-purposemotors, HDD pivots
General-purposemotors
General-purposemotors, air condi-tioner motors
VTR drum spindles
Cleaner motors
For wide tem-perature range
For high speedrotations andhigh temperatures
Consistencyafter 60 roundsof mixing( )
Consistencyafter 60 roundsof mixing( )
24
( )
8. Bearing Lubrication
……… (8.1)
log L = 6.10ー4.40×10ー6 dmn
ー(0.021ー1.80×10ー8 dmn)T
L
dm
n
P
C
T
:
:
::
:
:
:
grease life, h
, mm
rotation speed, minー1
equivalent radial load, N
basic dynamic load rating of bearing, N
bearing temperature, ℃
D + d2
There are some factors that have considerable influenceon the frictional torque of bearings. Such factors include thecage sliding friction, rolling friction caused by load, and theviscous resistance of the lubricant. It is possible to minimize the cage sliding friction and therolling friction by means of an appropriate design and a toler-ance finishing of the parts.
Bearing torque fluctuates depending on slight variations andwaviness in the raceway surfaces as these impair movementsof the rolling elements. The torque also varies according to the viscous resistanceof the lubricant, which changes with rotation speed, the qual-ity and quantity of lubricant, and temperature.
The frictional torque of a bearing is classified into startingtorque and running torque.
The starting torque is that which is required to overcomethe bearing's static friction. The starting torque varies de-pending on minor differences in tolerance of the raceway sur-faces and rolling elements and the position of the rolling ele-ments on the raceway surface immediately before the start.
The running torque refers to the frictional torque of a run-ning bearing. Its magnitude changes with rotation speed, thequality and quantity of lubricant, and atmospheric tempera-ture.
Typical data on running torque are shown in Figs. 9.1 to9.3.
ー2.50 ー0.05( )CP
8.4 Grease Life of Shielded and Sealed Deep Groove Ball Bearings
Grease life of shielded and sealed deep groove ball bear-ings in which grease is sealed is estimated by the equationbelow.
D: bearing outside diameterd: bearing bore diameter( )
where,
To apply Equation (8.1), the conditions below must be met.
Bearing temperature T ℃
The equation is applicable when 50 ≦ T ≦ 120.( If T < 50, assume that T = 50 )If T > 120, consult KOYO.
Rotation speed dmn
The equation is applicable when 12.5×104 ≦ dmn ≦ 50×104.( If dmn < 12.5×104, use dmn =12.5×104 )If dmn > 50×104, consult KOYO.
Load
The equation is applicable when 0.05 ≦ ≦ 0.2.
If <0.05, consider =0.05
If >0.2 , consult KOYO.
①
②
③
9. Bearing Torque
CPCP
CP
CPC
P
25
Miniature and Extra -small Ball Bearings
● Relationship between Rotation Speed and Running Torque In general, running torque increases as rotation speed increases (Fig. 9.1).
Fig. 9.1 Relationship between Rotation Speed and Running Torque
● Relationship between Temperature and Running Torque Running torque increases as temperature decreases(Fig. 9.2).
Fig. 9.2 Relationship between Temperature and Running Torque
● Relationship between Quantity of Sealed Grease and Running Torque Running torque increases as the quantity of sealed greaseincreases (Fig. 9.3).
Fig. 9.3 Relationship between Quantity of Sealed Grease and Running Torque
695
W693
608
�
Multemp SRL�30 %�20 ℃�
:�:�:�
3.5
3
2.5
2
1.5
1
0.5
01 800 3 600 7 200
mN ・m
minー1
Tor
que,
Rotation speed,
Grease brandQuantity of sealed greaseAtmospheric temperature
MultempSRL
Beacon 325
KNG 144
�BearingRotation speed
Quantity of sealed grease
608�1 800 minー1�30 %�
:�:�:�
0
6
5
4
3
2
1
-20 0 6020
℃�
mN ・m
Tor
que,
Atmospheric temp.,
Multemp SRL
Beacon 325
KNG144
�Bearing�
Rotation speedAtmospheric temperature
608�1 800 minー1�20 ℃�
:�:�:�
2.5
2
1.5
1
0.5
05 3015
Quantity of sealed grease,%�mN ・m
Tor
que,
26
Most bearing rings and rolling elements of miniature andextra-small ball bearings are made of high carbon chromebearing steel. Where bearings need to be corrosion resis-tant, martensite stainless steel is used.
For cages and shields, materials such as carbon steelsheets, stainless steel sheets (JIS SUS300 / 400 series), phe-nol resin, and reinforced polyamide resin are used.
Resin products used for miniature and extra-small ball bear-ings and their respective operating temperature ranges areshown in Table 10.3.
Resin Products used for Miniature andExtra-small Ball Bearings and TheirRespective Operating Temperature Ranges
ー 40~150
ー 40~180
ー 10~120
ー 30~130
ー 30~150
ー 10~100
MG
FG
RJ3
Resin cage
Resin seal
ResinProduct
CodeTemporary 1)
Operating Temperature Range, ℃Continued use
Note 1) "Temporary" denotes 2 to 3 minutes. Operation at such temperatures should not exceed 30 minutes
High carbonchrome bear-ing steel
JIS SUJ2
JIS SUS440C
Steel Class Code SimilarSteel Class
0.95~1.10
0.95~1.20
0.15~0.35
≦1.00
Chemical Composition, %
C Si Mn P S Cr Mo
≦0.50
≦1.00
≦0.025
≦0.04
ー
≦0.75
≦0.025
≦0.03
1.30 ~1.60
16.00~18.00
60~64
58~62
BearingHardness,HRC
SAE 52100
SAE 51440C
Table 10.2 Chemical Composition of Materials Used for Bearing Rings and Rolling Elements in Miniature and Extra-small Ball Bearings
Property
Cage
Shield / seal
Operating temperature 1)
Dynamic load rating
Static load rating
Frictional torque
Application
150 ℃ max.
High
High
Low
Reinforced polyamide resin
High-speed applications
Table 10.1 Materials Used for Miniature and Extra-small Ball Bearings and Their Properties
10. Bearing Materials
10. Bearing Materials
Materials used for miniature and extra-small ball bearingsand their properties are shown in Table 10.1. Chemical composition of materials used for bearing ringsand rolling elements in miniature and extra-small ball bear-ings are shown in Table 10.2.
Material
High carbon chrome bearing steel Stainless steel
Stainless steel sheet
300 ℃max.
85 % of bearing steel
80 % of bearing steel
Bearing ring /rolling element
General /high-tolerance purposes
Carbon steel sheet /stainless steel sheet Nitrile rubber /
reinforced polyamide resin
Corrosion / heatresistance
Higher thanbearing steel
Actual operating temperature is limited by cage material, seal material, and lubricant.Table 10.3 shows a guideline for operating temperature ranges in relation to resin cages and resin seals.If it is necessary to use a lubricant containing a specific additive, consult KOYO
Stainlesssteel
Table 10.3
Note 1)
27
Miniature and Extra -small Ball Bearings
Fig. 11.1 Shaft Diameter Measuring Positions
Fig. 11.2 Measuring Positions of Housing Bore Diameter
Additionally, carry out a thorough inspection of the shaftand housing fillet radius and shoulder quareness.
Bearings are shipped after high-quality rust preventive oilis applied to them followed by suitable wrapping. Their qual-ity is guaranteed as long as the wrapping is not damaged.
Bearings, if to be stored for an extended time, should be storedon a shelf at least 30 cm above the floor under conditionsof 65 % or less humidity at a temperature of around 20℃. Avoid any place that allows direct exposure to the sun orcontact with a cool wall.
11. Handling of Bearings
Since miniature and extra-small ball bearings are made toa higher tolerance than ordinary mechanical parts, one shouldaccordingly handling them with due care.
11.1 General Precautions for Handling
1)2)
3)4)
5)
6)
・・・・・・
Maintain bearings and their vicinity cleanHandle with care A severe shock to a bearing by rough handling may result in flaws, dents, fractures, and chipping.Use the correct tools for handlingExercise care for the prevention of rust Avoid handling them in a highly humid place. Wear gloves to prevent body oils from contactingthe bearing surface.Bearings should be handled by knowledgeablepersonsWork standards for handling bearings should beformulatedStorage of bearingsCleansing of bearings and surrounding partsInspection of dimensions and finish of partssurrounding bearingsMountingInspection after mountingMaintenance / inspection (regular inspection)
11.2 Storage of Bearings
11.3 Mounting Bearings
11.3.1 Precautions for Mounting1) Preparation Unwrap bearings just prior to mounting because they arewrapped to prevent rust.
The rust preventive oil applied to bearings offers good lu-brication, so bearings for general use or grease-sealed bear-ings can be used immediately, without cleansing. For measuring instruments and open type bearings for high-speed applications, remove preventive oil with clean wash-ing oil. As rust is easily formed on bearings after they are cleansed,do not leave them unattended for long periods.
2) Inspection of Shaft and Housing Clean the shaft and housing and verify that they are flaw-less and have no burrs caused by machining. The inside of the housing should be absolutely free fromany residual lapping compound (SiC, A l 2O 3, etc.), moldingsand, or chips.
Next, ensure that the shaft and housing are fabricated tothe dimensions, shapes, and finish as specified on the de-sign drawing.
Measure the shaft diameter and bore diameter of the hous-ing at several positions as shown in Figs. 11.1 and 11.2.
28
11. Handling of Bearings
11.3.2 Mounting Bearings Different methods are used to mount bearings dependingon model and fitting conditions. Since, in many cases, theinner ring rotates, an interference fit is used for the inner ringsand a clearance fit is used for the outer rings. If the outer ring is to rotate, an interference fit is used for theouter rings.
Table 11.1 shows methods used to mount bearings with aninterference fit.
Trial run and inspection are carried out when bearings havebeen mounted, to check whether the mounting is appropri-ate.
In the case of small machines, the rotation condition is ex-amined initially by manual operation. After confirmation thatno fault exists as noted below, a further inspection is carriedout by a powered run.
●
●
●
Table 11.1 Press-fitting of Cylindrical Bore Bearings
Press-fitting Method Description
Whatever method is used, force should be applied to the bearingevenly. For that purpose, use a fixture and fit bearing gently. Do not apply a fixture to the outer ring for press-fitting of the innerring, or vice versa
Press-fittingof inner ring )
When both inner and outerrings of non-separable bear-ings require interference,use two kinds of fixtures asshown on the right andpress-fit the bearing gentlybecause rolling elements arelikely to be damaged. Do not use a hammer insuch cases Simultaneous press-fitting
of inner and outer rings
(a) Use of press (most common)
(b) Use of nut and bolt (c) Use of hammer
To be used only whenno other method isavailable〔 〕
Threaded ho lemust be bored inshaft end〔 〕
●
●
11.4 Trial Run and Inspection
…………………
………
………
Knocking
Excessive torque(heavy)
Uneven runningtorque
Possible causes are entry offoreign matter, flaw in rollingsurfaces, etc
Possible causes are friction inthe sealing device, insuffi-cient clearance, mounting er-rors, etc
Possible causes are defec-tive mounting, mounting er-rors, etc
(Hydraulic pump)
Mounting fixture
Mounting fixture
( Press-fittingof inner ring )(Press-fitting
of outer ring)(
Mounting fixture
Mountingfixture
)(
29
Miniature and Extra -small Ball Bearings
Before removing bearings, consider their use after removal.
If bearings are to be disposed of, adopt as effortless amethod as possible. Removing bearings for re-use or to identify causes of fail-ure should be carried out with the same care as at time ofmounting to avoid damage.
Specifically, bearings fitted with an interference are likely tobe damaged during removal, how to remove bearings shouldbe taken into consideration at the design stage. It is recommended to design and make an appropriate jigfor removal.
Marking the direction and position on the bearing is usefulfor identifying the causes of failure.
Bolt holes and bolts for removal
Table 11.3 Removal of Outer Ring
Outer Ring Removal Method Description
Bolt holes should have been bored inadvance and be used to remove anouter ring fitted with interference
●
Table 11.2 Removal of Cylindrical Bore Bearings
Inner Ring Removal Method Description
When removing a non-separable bear-ing, no external force should be appliedto the rolling elements
The simplest way is to draw out thebearing with a press as shown in Fig.(a). Provide a fixture to apply the forceto the inner ring
The method illustrated in Fig. (b) usesa specific removal jig. Ensure that the claws of the jig catchthe side face of the inner ring(a) Removal by press (b) Removal by jig
●
●
●
11.5 Removal of Bearings ●
Tables 11.2 and 11.3 show common methods used for re-moving bearings for re-use or to investigate causes of failure,with interference fits.
Removal Methods
Fixtures
30
Ceramics (silicon nitride) are suitable for making high-speedand light-weight bearings. Ceramic bearings have excellent features in that they arehighly rigid, heat resistant, and highly corrosion resistant, aswell as non-magnetic and non-conductive. Ceramic miniature and extra-small ball bearings are usedin a wide range of advanced technological areas.
For details of ceramic bearings, refer to the KOYO ExtremeSpecial Environment Bearings Catalog (EXSEV bearings),CAT. NO. 208E.
Table 12.1 shows a comparison between characteristics ofceramics and high carbon chrome bearing steel.
Less likely to generate adhesion (transfer)between rolling contacts if oil film diminishes
120
3.2
℃
ItemUnit
Ceramics(Si3N4)
Bearing Steel(SUJ 2)
Features and Characteristics of Ceramics
g / cm3
12. Ceramic Bearings
12. Ceramic Bearings
12.1 Properties of Ceramics
Table 12.1 Comparison between Characteristics of Ceramics (Si3N4) and High Carbon Chrome Bearing Steel (SUJ 2)
Maintains high load capacity at high temperatures
Reduction in centrifugal force of rolling elements(balls and rollers)→ Lengthened life and prevention of temperature increase
Small changes in internal clearance caused bytemperature increase→Prevention of vibrations, and small changes in preload force
Minor deformation in rolling contact zone→ High rigidity
Serviceable in special environments such asacid or alkali solutions
Minor rotation fluctuations caused bymagnetic forces in a strong magnetic field
Prevention of electric pitting (motors etc.)
Heat resistance
Density
Coefficient oflinear expansion
Modulus of longitudinalelasticity
Poisson's ratio
Bonding form of material
Electrical conductivity
Magnetism
Corrosion resistance
Covalent bond
Insulant
Non-magneticmaterial
Good
0.29
314
1 400~1 700
3.2×10ー6
Metallic bond
Electricalconductor
Ferromagneticmateria
No good
0.3
206
700~800
800
12.5×10ー6
7.8
GPa
HV
1/℃
Vickers' hardness
31
Miniature and Extra -small Ball Bearings
12.2.2. Long Life The service life of ceramic bearings is several times longerthan that of steel bearings; not only with grease lubrication,but also with oil lubrication.
Test bearing
Bearing
Rotation speed
Load
Grease
629 ZZL50 000 minー1(dn 45×104)
axial 108 NKNG 170(Grease fill is 25 % of inner space)
:
:
:
:
12.2.1. High rotation speed Ceramics are lighter than bearing steel. Accordingly, thecentrifugal force and sliding caused by gyroscopic momentsare reduced in rolling elements rotating at a high speed ifthey are made of ceramics. Consequently, ceramics are highly effective in controllingtemperature increases.
Test bearing
Performance
Ceramic bearings are capable of rotating at a 15 % higherspeed than steel bearings
Bearing
Ball
Cage
3NCOB74ST4M3
Ceramics (silicon nitride)
SUS440C
Heat-resistant reinforced polyimide resin1 2 3 4 5
4
2.5
1Standard bearing (Steel sheet cage)
Standard bearing(Molded resin cage)
Hybrid ceramic bearing
Life ratio
φ6.350
φ3.175
2.380
5
6
4
3
2
1
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Supplied air pressure, MPa
Ceramic bearing
Steel bearing
Rot
atio
n sp
eed,
×10 5min
ー1
12.2 Features of Ceramic Bearings
●
Inner andOuter Rings
Unit mm
Performance
32
12.3 Application Examples of Ceramic Bearings
:
:
:
:
Test method
thrust tester
1 400 minー1
axial 1 176 N (per ball)
class 1 turbine oil (ISO VG56 equivalent)
Shaft washer�(SUJ 2)��Flat platetest piece
Balls(SUJ 2)�3/8" × 3
Cage
Shaft
97.5
90
50
10
21 2 5 10 20 50 100 200 500
Life time, h
Bearing steel
Regressionline of all results
Ceramics (silicon nitride)
Regression line obtained by discarding all results higher than 50 %
Cum
ulat
ive
brea
kage
pro
babi
lity,
%�
12. Ceramic Bearings
TurbochargersSpindle motorsDental hand piecesPolygon scanner motorsYarn twisting spindlesStepping motorsHeat rollersSemiconductor production facilitiesVacuum equipmentAero space development related equipment
・・・・・・・・・・
12.2.3. Light Weight The density of ceramics is approximately 40 % of bearingsteel. Therefore, ceramics are an ideal material for reducingthe weight of bearings.
12.2.4. Small Dimensional Changes with Respect to Temperature The coefficient of linear expansion of ceramics is small(25 % of bearing steel).
12.2.5. High Rigidity The hardness and the modulus of longitudinal elasticity aregreater than that of bearing steel.
12.2.6. Insulation Prevents electric pitting
Test apparatus
Rotation speed
Load
Lubricant
Performance
33
Miniature and Extra -small Ball Bearings
13. Products Information
KOYO is engaged in the manufacture and sales of all typesof tolerance miniature and extra-small ball bearings such asopen and sealed types as well as those with outer ring flangeand locating snap ring.
● Miniature and Extra-small Ball Bearings
Our recent developments, which include ceramic bearingsand those with resin flanges, are used in a variety of applica-tions.
34
Ceramic Bearings (EXSEV bearings)
FN Bearings Miniature and Extra-small Ball Bearings with Resin Flanges
Miniature and Extra-small Ball Bearingswith Resin Seals
●
● ●
13. Products Information
( )
35
Miniature and Extra -small Ball Bearings
We also produce a number of applied products such asbearings with resin or rubber pulleys and small spindle unitshaving built-in bearings.
For additional products, consult KOYO.
● Miniature and Extra-small Ball Bearings with Pulleys
● Small Spindle Units
36
Miniature Linear Ball Bearings
● Miniature One-way Clutches ●
●
Miniature Drawn Cup Needle Roller Bearings
13. Products Information
( )Miniature one-way clutches with resin pulleys orresin gears are also available
37
Miniature and Extra -small Ball Bearings
Deep Groove Ball Bearings - Standard series
Deep Groove Ball Bearings - Thin section series
Deep Groove Ball Bearings - Narrow-width series
Deep Groove Ball Bearings with Flanges - Standard series
Deep Groove Ball Bearings with Flanges - Thin section series
Deep Groove Ball Bearings with Resin Flanges - FN Bearings
Bearing Dimension TablesCONTENTS
[ Metrie series ]
[ Inch series ]
Deep Groove Ball Bearings
Deep Groove Ball Bearings with Flanges
54
56
38
42
44
46
50
52
1.
2.
3.
4.
5.
6.
1.
2.
1
2
3
4
5
6
7
8
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
○ ○ ○ ○ ○ ○ ○ ○
○ ○ ○ ○ ○
○ ○ ○ ○ ○ ○ ○
Miniature and Extra -small Ball Bearings
1.8
1.8
2.72.3
3.22.83.2
3.2
3.73.33.7
4.24.24.2
4.6
5.25.65.6
6
6.66.67
7
140 000
140 000
130 000100 000
100 000100 00079 000
79 000
79 00075 00076 000
76 00072 00063 000
54 000
65 00063 00054 000
49 000
60 00060 00049 000
43 000
691
ML1204
69/1.5ML1506
692ML2006ML2007602
69/2.5ML2508/1BML2508
693603623633
694604624634
695605625635
ー
ー
W69/1.5 ZZXWML1506 ZZX
W692 ZZWML2006 ZZXWML2007 ZZXW602 ZZX
W69/2.5 ZZ ーWML2508 ZZX
W693 ZZW603 ZZX623 ZZ633 ZZ
694 ZZ604 ZZ624 ZZ634 ZZ
695 ZZ605 ZZ625 ZZ635 ZZ
ー
ー
ーー
ーーー
ー
ーーー
ーーー
ー
ーーー
ー
2RDー2RD2RD
ー
ー
ーー
ーーー
ー
ーーー
ーーー
ー
2RUー2RUー
2RUー2RU2RU
ー
ー
ーー
ーーー
ー
ーーー
ーー2RSー
2RSー2RSー
2RSー2RS2RS
3.2
3.4
3.8 5.2
4.8 5.2 5.8
5.8
5.8 7.2 6.8
6.8 7.8 8.8
11.4
9.810.411.4
14
11.412.414
17
0.1
0.07
0.150.1
0.10.10.15
0.15
0.150.10.1
0.150.150.15
0.2
0.150.20.2
0.3
0.20.20.3
0.3
0.1
0.1
0.1 0.3
0.2 0.3 0.4
0.5
0.4 0.6 0.6
0.6 0.9 1.6
3.0
1.8 2.1 2.9
5.3
2.2 3.5 5.0
8.5
1
1.2
1.5
2
2.5
3
4
5
4
4
56
667
7
788
8910
13
111213
16
131416
19
0.1
0.08
0.150.1
0.150.10.15
0.15
0.150.10.15
0.150.150.15
0.2
0.150.20.2
0.3
0.20.20.3
0.3
ー
ー
2.6 3
3 3 3
3.5
3.5 ー 4
4 5 4
5
4 4 5
5
4 5 5
6
ー
ー
0.150.1
0.10.10.15
0.15
0.15 ー0.1
0.150.150.15
0.2
0.150.20.2
0.3
0.20.20.3
0.3
0.04
0.04
0.060.10
0.100.100.13
0.13
0.110.150.17
0.170.160.23
0.49
0.350.360.49
0.67
0.430.480.67
1.05
0.14
0.16
0.190.33
0.330.330.39
0.39
0.310.430.55
0.550.430.64
1.30
0.960.971.30
1.75
1.101.301.75
2.60
120 000
120 000
110 00086 000
86 00086 00067 000
67 000
66 00063 00064 000
64 00060 00052 000
44 000
54 00053 00044 000
40 000
50 00050 00040 000
35 000
1.6
1.8
22.5
2.32.52.5
2.8
2.52.52.8
334
5
445
5
455
6
ー
ー
ーー
ーーー
ー
ーーー
ーーー
ー
ーーー
ー
45 000ー
36 000
32 000
ー
ー
ーー
ーーー
ー
ーーー
ーー
44 000
ー
44 000ー
39 000
ー
42 000ー
33 000
27 000
BBr
rφD φ r1 r1r1
r11 r1
r1
r1
r1
r1
r1
r1r1
Open type Shielded typeContact
sealed typeNon-contact sealed type
Extremely light contact sealed type
ZZ ZZX ZZL 2RS2RU 2RD
d
B1 B1 B1B1 B1 r
rφD φd
�r
rφD φd
�a
a
a a
a
a
aa
If, however, P0<Fr , assume P0=Fr
0.0140.0280.056
0.0840.110.17
0.280.420.56
0.190.220.26
0.280.300.34
0.380.420.44
1 0 0.56
2.301.991.71
1.551.451.31
1.151.041.00
X Y X Ye
P0=0.6F r+0.5Fa
P=XFr+YFa
≦ e > eC0Fa
FaFr
FaFr
Dynamic equivalent load
Static equivalent load
ML1204, ML1506, ML2006, ML2007, ML2508/1B, and ML2508 correspond to former bearing numbersOB05, OB08, OB13, OB14, OB16, and OB17, respectively
Note 1)
Full-size Drawing
Bearing number Mounting dimensions (Refer.)Mass(g)
Oil lub.
Open type Shielded type Sealed type(min.) (max.) (max.)
da Da raCr Cor
1)
(mm)
(Open type)
Basic load ratings Limiting speedsBoundary dimensions
d D B B1Grease lub.
Dynamic Static(kN)(mm)
( 2RD ) ( 2RS ) ( )ZXr r1
(min.) ( )ZZX,2RU(min.)
(minー1)
Open type Open type
Deep Groove Ball Bearings [ Metric Series ]
Standard series d 1~5 mm
604
625
633
691
ML1204
ML1506
692
602
ML2508
693
605
38 39
Miniature and Extra -small Ball Bearings
6
7
8
9
151719
1922
171922
2226
192224
28
202426
30
0.20.30.3
0.30.3
0.30.30.3
0.30.3
0.30.30.3
0.3
0.30.30.6
0.6
5 6 6
8 7
5 6 7
8 9
6 7 8
9
6 7 8
10
0.20.30.3
0.30.3
0.30.30.3
0.30.3
0.30.30.3
0.3
0.30.30.6
0.6
0.670.741.05
1.051.35
0.711.051.35
1.351.95
0.911.351.40
1.95
1.051.401.95
2.65
1.751.952.60
2.603.30
1.602.603.30
3.304.55
2.253.303.35
4.55
2.453.354.55
6.00
45 00043 00035 000
40 00031 000
42 00040 00031 000
34 00026 000
39 00034 00028 000
26 000
35 00033 00027 000
24 000
54 00051 00043 000
47 00037 000
50 00047 00037 000
41 00032 000
46 00041 00035 000
32 000
42 00040 00033 000
29 000
696606626ML6019636
697607627ML7022637
698608628638
699609629639
696 ZZ606 ZZ626 ZZML6019 ZZ636 ZZ
697 ZZ607 ZZ627 ZZML7022 ZZ637 ZZ
698 ZZ608 ZZ628 ZZ638 ZZ
699 ZZ609 ZZ629 ZZ639 ZZ
2RD2RD2RDーー
ー2RD2RDーー
2RD2RDー
2RD
2RD2RD2RDー
5 6 6
8 7
5 6 7
8 9
6 7 8
9
6 7 8
10
2RU2RU2RUーー
ー2RU2RUーー
ー2RU2RUー
ー2RU2RUー
2RSー2RSー2RS
2RS2RS2RSーー
2RS2RS2RSー
2RS2RS2RSー
7.6 8 8
7 8
9 9 9
9 9
101010
10
111112.1
13
13.41517
1820
151720
2024
172022
26
182222
26
0.20.30.3
0.30.3
0.30.30.3
0.30.3
0.30.30.3
0.3
0.30.30.3
0.6
3.9 5.8 8.1
9.013
5.3 7.613
1424
7.21218
29
7.51520
35
( ) ( )
41 00039 00032 000
ー ー
ー36 00028 000
ー ー
35 00031 000 ー
23 000
32 00030 00024 000
ー
32 000 ー27 000
ー23 000
28 00027 00023 000
ー ー
27 00023 00022 000
ー
25 00022 00019 000
ー
BBr
rφD φ r1 r1r1
r11 r1
r1
r1
r1
r1
r1
r1r1
Open type Shielded typeContact
sealed typeNon-contact sealed type
Extremely light contact sealed type
ZZ ZZX ZZL 2RS2RU 2RD
d
B1 B1 B1B1 B1 r
rφD φd
�r
rφD φd
�a
a
a a
a
a
aa
Full-size Drawing
Bearing number Mounting dimensions (Refer.)Mass(g)
Oil lub.
Open type Shielded type Sealed type(min.) (max.) (max.)
da Da raCr Cor
2)
(mm)
(Open type)
Basic load ratings Limiting speedsBoundary dimensions
d D B B1Grease lub.
Dynamic Static(kN)(mm)
( 2RD ) ( 2RS ) ( )Zr r1
(min.) ( )ZZ,2RU(min.)
(minー1)
Open type Open type
Standard series d 6~9 mm
Values in ( ) do not conform to JIS B 1521Notes 1)
2) ML6019 and ML7022 correspond to former bearing numbers OB47 and OB52, respectively
1)
Deep Groove Ball Bearings [ Metric Series ]
1)
If, however, P0<Fr , assume P0=Fr
0.0140.0280.056
0.0840.110.17
0.280.420.56
0.190.220.26
0.280.300.34
0.380.420.44
1 0 0.56
2.301.991.71
1.551.451.31
1.151.041.00
X Y X Ye
P0=0.6F r+0.5Fa
P=XFr+YFa
≦ e > eC0Fa
FaFr
FaFr
Dynamic equivalent load
Static equivalent load
696��
ML7022
698
609
40 41
Miniature and Extra -small Ball Bearings
1
1.5
2
2.5
3
4
5
6
7
8
9
33
4
55
6
678
789
10
8910
11
101213
111314
121416
17
0.070.08
0.1
0.10.1
0.1
0.080.150.1
0.080.10.15
0.15
0.080.10.1
0.15
0.10.150.15
0.10.150.15
0.10.150.2
0.2
ーー
2
2.32.5
2.6
2.53ー
2.534
4
2.534
5
345
345
3.545
5
ー ー
0.1
0.10.08
0.1
0.050.15 ー
0.050.080.15
0.1
0.050.080.1
0.15
0.080.10.15
0.080.150.15
0.080.150.2
0.2
0.030.02
0.03
0.060.06
0.06
0.060.110.15
0.110.140.23
0.23
0.120.190.21
0.36
0.220.290.44
0.230.380.51
0.300.420.71
0.66
0.100.08
0.11
0.190.19
0.19
0.190.310.43
0.260.400.64
0.65
0.260.470.50
0.97
0.500.711.10
0.430.821.15
0.570.871.60
1.35
130 000130 000
120 000
98 00098 000
75 000
75 00066 00063 000
64 00061 00059 000
56 000
59 00056 00055 000
53 000
53 00049 00048 000
49 00047 00045 000
47 00044 00042 000
39 000
150 000150 000
140 000
110 000110 000
89 000
89 00079 00075 000
76 00073 00070 000
67 000
70 00067 00065 000
63 000
63 00059 00057 000
59 00055 00054 000
55 00052 00050 000
46 000
681ML1003
68/1.5
682ML2005
68/2.5
ML3006683ML3008
ML4007ML4008684ML4010
ML5008ML5009ML5010685
ML6010ML6012686
ML7011ML7013687
ML8012ML8014688
689
ー ー
W68/1.5 ZZ
W682 ZZXWML2005 ZZ
W68/2.5 ZZ
WML3006 ZZW683 ZZ ー
WML4007 ZZWML4008 ZZW684 ZZWML4010 ZZ
WML5008 ZZWML5009 ZZWML5010 ZZW685 ZZ
WML6010 ZZWML6012 ZZW686 ZZ
WML7011 ZZXWML7013 ZZW687 ZZ
WML8012 ZZWML8014 ZZW688 ZZ
W689 ZZ
ーー
ー
ーー
ー
ーーー
ーーー
ー
ーーー
ー
ーー2RD
ーーー
ーー2RD
2RD
11.5
1.2
1.52
1.8
222.5
222.5
3
22.53
3
2.533.5
2.533.5
2.53.54
4
ーー
ー
ーー
ー
ーーー
ーーー
ー
ーーー
ー
ーーー
ーーー
ーー2RU
2RU
ーー
ー
ーー
ー
ーーー
ーーー
ー
ーーー
ー
ー2RS2RS
ーーー
ーー2RS
ー
1.6 1.6
2.3
2.8 2.6
3.3
3.6 4.2 3.8
4.6 4.8 5.2
5.2
5.6 5.8 5.8
6.2
6.8 7.2 7.2
7.8 8.2 8.2
8.8 9.2 9.6
10.6
2.4 2.4
3.2
4.4 4.2
5.2
5.4 5.8 7.2
6.4 7.2 7.8
8.8
7.4 8.2 9
9.8
9.210.811.8
10.211.812.8
11.212.814.4
15.4
0.050.07
0.1
0.10.07
0.1
0.050.10.1
0.050.080.1
0.1
0.050.080.1
0.15
0.080.10.15
0.080.150.15
0.080.150.2
0.2
0.03 0.05
0.1
0.1 0.1
0.2
0.2 0.3 0.5
0.2 0.4 0.6
1.0
0.3 0.5 0.9
1.0
0.6 1.3 1.8
0.7 1.4 2.0
0.8 1.8 3.2
3.5
( ) ( )
( ) ( )
ーー
ー
ーー
ーー
ーーー
ーーー
ー
ーーー
ー
ーー
43 000
ーーー
ーー
38 000
35 000
ーー
ー
ーー
ーー
ーーー
ーーー
ー
ーーー
ー
ー37 00036 000
ーーー
ーー
28 000
ー
BBr
rφD r1 r1r1
r11 B1 B1 B1B1 1r1 r1 r1r1B r1
r1r1 r1ZZ ZZX ZZL 2RS2RU 2RD
φd
Open type Shielded typeContact
sealed typeNon-contact sealed type
Extremely light contact sealed type
r
rφD φd
�r
rφD φd
�
a
a
a
a a a
a
a
Full-size Drawing
Bearing number Mounting dimensions (Refer.)Mass(g)
Oil lub.
Open type Shielded type Sealed type(min.) (max.) (max.)
da Da raCr Cor
2)
(mm)
(Open type)
Basic load ratings Limiting speedsBoundary dimensions
d D B B1Grease lub.
Dynamic Static(kN)(mm)
( 2RD ) ( 2RS ) ( )Zr r1
(min.) ( )ZZ,2RU(min.)
(minー1)
Open type Open type
Thin section series d 1~9 mm
Values in ( ) do not conform to JIS B 1521Notes 1)
2) ML1003 and ML2005 correspond to former bearing numbers OB03 and OB11, respectively
1)
Deep Groove Ball Bearings [ Metric Series ]
If, however, P0<Fr , assume P0=Fr
0.0140.0280.056
0.0840.110.17
0.280.420.56
0.190.220.26
0.280.300.34
0.380.420.44
1 0 0.56
2.301.991.71
1.551.451.31
1.151.041.00
X Y X Ye
P0=0.6F r+0.5Fa
P=XFr+YFa
≦ e > eC0Fa
FaFr
FaFr
Dynamic equivalent load
Static equivalent load
1)
ML5010
ML6010
ML7011
ML4007
ML4010
681
68 / 1.5
682
68 / 2.5
ML3006
689
ML8014
42 43
Miniature and Extra -small Ball Bearings
44 45
d D B Da ra
2
3
4
5
6
5
78
8910
1113
1315
0.08
0.150.15
0.080.150.15
0.150.2
0.150.2
( )
0.06
0.130.17
0.110.230.35
0.280.43
0.440.60
0.19
0.340.55
0.310.640.96
0.711.10
1.101.50
98 000
66 00064 000
61 00059 00054 000
53 00050 000
48 00045 000
110 000
79 00076 000
73 00070 00065 000
63 00060 000
57 00054 000
ML2005/1B Z
683 Z693/1B Z
ML4008 Z684/1B Z694/1B Z
685/1B Z695/1B Z
686/1B Z696/1B Z
1.6
22.6
22.63
43
33.5
2.6
4.2 4.2
4.8 5.2 5.2
6.2 6.6
7.2 7.6
4.2
5.8 6.8
7.2 7.8 9.8
9.811.4
11.813.4
0.07
0.10.15
0.080.10.15
0.150.2
0.150.2
0.1
0.3 0.5
0.4 0.6 1.8
1.0 2.2
1.8 2.8
( )
(kN)
r 1)(minー1)
Cr Cor
(mm)
Br
rφD φd
r
r�φD φd
�
a a
a
a
Full-size Drawing
Bearing number Mounting dimensions (Refer.)
Mass
(g) Oil lub. Shielded type(min.) (max.) (max.)
da
Basic load ratings Limiting speedsBoundary dimensions
Grease lub.Dynamic Static
(mm)
(min.)
Narrow-width series d 2~6 mm
Values in ( ) do not conform to JIS B 1521Note 1)
If, however, P0<Fr , assume P0=Fr
0.0140.0280.056
0.0840.110.17
0.280.420.56
0.190.220.26
0.280.300.34
0.380.420.44
1 0 0.56
2.301.991.71
1.551.451.31
1.151.041.00
X Y X Ye
P0=0.6F r+0.5Fa
P=XFr+YFa
≦ e > eC0Fa
FaFr
FaFr
Dynamic equivalent load
Static equivalent load
Deep Groove Ball Bearings [ Metric Series ]
ML2005 / 1B Z
683 Z
684 / 1B Z
686 / 1B Z
695 / 1B Z
Miniature and Extra -small Ball Bearings
46 47
1
1.5
2
2.5
3
4
5
4
56
667
7
788
8 910
13
111213
16
131416
19
0.1
0.150.1
0.150.10.15
0.15
0.150.10.15
0.150.150.15
0.2
0.150.20.2
0.3
0.20.20.3
0.3
ー
2.63
333
3.5
3.5ー4
454
5
445
5
455
6
0.14
0.170.33
0.330.330.39
0.39
0.390.550.56
0.570.570.63
1.30
0.960.961.30
1.35
1.101.351.75
2.35
120 000
110 00086 000
86 00086 00067 000
67 000
66 00064 00063 000
60 00060 00061 000
50 000
54 00054 00050 000
47 000
49 00048 00045 000
40 000
F691
F69/1.5MLF1506
F692MLF2006MLF2007F602
F69/2.5MLF2508/1BMLF2508
F693F603F623F633
F694F604F624F634
F695F605F625F635
ー
WF69/1.5 ZZWMLF1506 ZZ
WF692 ZZWMLF2006 ZZWMLF2007 ZZWF602 ZZ
WF69/2.5 ZZX ーWMLF2508 ZZ
WF693 ZZWF603 ZZF623 ZZF633 ZZ
F694 ZZF604 ZZF624 ZZF634 ZZ
F695 ZZF605 ZZF625 ZZF635 ZZ
1.6
22.5
2.32.52.5
2.8
2.52.52.8
334
5
445
5
455
6
0.1
0.2 0.4
0.3 0.4 0.5
0.6
0.5 0.7 0.7
0.7 1.0 1.8
3.4
2.0 2.3 3.3
5.7
2.5 3.9 5.4
9.7
ー
0.150.1
0.10.10.15
0.15
0.15ー0.1
0.150.150.15
0.2
0.150.20.2
0.3
0.20.20.3
0.3
0.04
0.050.10
0.100.100.13
0.13
0.130.170.18
0.190.190.22
0.48
0.350.350.48
0.52
0.430.510.67
0.89
140 000
130 000100 000
100 000100 00079 000
79 000
79 00076 00075 000
72 00072 00072 000
60 000
65 00065 00060 000
55 000
59 00057 00054 000
47 000
MLF1506, MLF2006, MLF2007, MLF2508/1B, and MLF2508 correspond to former bearing numbersOBF08, OBF13, OBF14, OBF16, and OBF17, respectively
5
6.5 7.5
7.5 7.2 8.2
8.5
8.5 9.2 9.5
9.510.511.5
15
12.513.515
18
151618
22
ー
0.80.8
0.80.60.6
0.9
0.9ー0.9
0.911
1
111
1
111
1.5
0.5
0.60.6
0.60.60.6
0.7
0.70.60.7
0.70.71
1
111
1
111
1.5
1.8
2.72.3
3.22.83.2
3.2
3.73.53.7
4.24.24.2
4.6
5.25.65.6
6
6.66.67
7
0.1
0.150.1
0.10.10.15
0.15
0.150.10.1
0.150.150.15
0.2
0.150.20.2
0.3
0.20.20.3
0.3
B CBBB
r
r
φD φ φD r1 r1r1
r1 r1r1
1
1 11
1 φD2 φD2 φD2ZZ ZZX ZZL
d
C2 C2C2
rφd
�
a
a
Open type Shielded type
rφd
a
a
d D B B1 r r1Cr Cor
(minー1)(mm)
C2C1
Flange dimensions(mm)
da ra(mm) Full-size Drawing
Bearing number Mounting dimensions
(Refer.)
Mass
(g) Oil lub. Open type Shielded type
(max.) (Open type)
Basic load ratings Limiting speedsBoundary dimensions
Grease lub.Dynamic Static
(kN)
(min.)(min.)
Standard series d 1~5 mm
Bearings with locating snapring on outer ring are alsoavailable. Consult KOYO
Deep Groove Ball Bearings with Flanges [ Metric Series ]
If, however, P0<Fr , assume P0=Fr
0.0140.0280.056
0.0840.110.17
0.280.420.56
0.190.220.26
0.280.300.34
0.380.420.44
1 0 0.56
2.301.991.71
1.551.451.31
1.151.041.00
X Y X Ye
P0=0.6F r+0.5Fa
≦ e > eC0Fa
FaFr
FaFr
Dynamic equivalent load
Static equivalent load
D 1・D 2(min.)
1)
Note 1)
P= XFr+YFa
F691
MLF1506
MLF2006
MLF2508
F603
F623
F694
F625
F624
F692
Miniature and Extra -small Ball Bearings
48 49
6
7
8
9
151719
22
171922
26
1922
2024
0.20.30.3
0.3
0.30.30.3
0.3
0.30.3
0.30.3
566
7
567
9
67
67
1.352.252.35
3.30
1.602.353.30
4.60
2.253.30
2.453.35
47 00043 00040 000
34 000
42 00040 00034 000
29 000
39 00034 000
37 00032 000
F696F606F626F636
F697F607F627F637
F698F608
F699F609
F696 ZZF606 ZZF626 ZZF636 ZZ
F697 ZZF607 ZZF627 ZZF637 ZZ
F698 ZZF608 ZZ
F699 ZZF609 ZZ
566
7
567
9
67
67
4.3 6.3 9.2
14
5.8 8.714
26
8.313
8.716
0.20.30.3
0.3
0.30.30.3
0.3
0.30.3
0.30.3
0.520.840.89
1.35
0.710.891.35
1.95
0.911.35
1.051.45
55 00052 00047 000
41 000
50 00047 00041 000
35 000
46 00041 000
44 00038 000
171922
25
192225
29
2225
2327
1.21.21.5
1.5
1.21.51.5
2
1.51.5
1.51.5
1.21.21.5
1.5
1.21.51.5
2
1.51.5
1.51.5
7.6 8 8
8
9 9 9
9
1010
1111
0.2 0.3 0.3
0.3
0.3 0.3 0.3
0.3
0.3 0.3
0.3 0.3
B CBBB
r
r
φD φ φD r1 r1r1
r1 r1r1
1
1 11
1 φD2 φD2 φD2ZZ ZZX ZZL
d
C2 C2C2
rφd
�
a
a
Open type Shielded type
rφd
a
a
d D B B1 r r1Cr Cor
(minー1)(mm)
C2C1
Flange dimensions(mm)
da ra(mm) Full-size Drawing
Bearing number Mounting dimensions
(Refer.)
Mass
(g) Oil lub. Open type Shielded type
(max.) (Open type)
Basic load ratings Limiting speedsBoundary dimensions
Grease lub.Dynamic Static
(kN)
(min.)(min.)
Standard series d 6~9 mm
Bearings with locating snapring on outer ring are alsoavailable. Consult KOYO
F696
F697
F609
Deep Groove Ball Bearings with Flanges [ Metric Series ]
If, however, P0<Fr , assume P0=Fr
0.0140.0280.056
0.0840.110.17
0.280.420.56
0.190.220.26
0.280.300.34
0.380.420.44
1 0 0.56
2.301.991.71
1.551.451.31
1.151.041.00
X Y X Ye
P0=0.6F r+0.5Fa
≦ e > eC0
FaFa
Fr
Fa
Fr
Dynamic equivalent load
Static equivalent load
D 1・D 2(min.)
P= XFr+YFa
Miniature and Extra -small Ball Bearings
1
1.5
2
2.5
3
4
5
6
7
8
9
3
4
55
6
678
789
10
8910
11
101213
111314
121416
17
0.07
0.1
0.10.1
0.1
0.080.150.1
0.080.10.15
0.15
0.080.10.1
0.15
0.10.150.15
0.10.150.15
0.10.150.2
0.2
ー
2
2.32.5
2.6
2.53 ー
2.534
4
2.534
5
345
345
3.545
5
ー
0.1
0.10.08
0.1
0.050.15ー
0.050.080.15
0.1
0.050.080.1
0.15
0.080.10.15
0.080.150.15
0.080.150.2
0.2
0.03
0.03
0.050.05
0.07
0.070.110.14
0.110.140.23
0.27
0.090.170.17
0.28
0.220.290.44
0.200.280.51
0.270.420.59
0.66
0.10
0.11
0.170.17
0.21
0.210.310.40
0.250.400.64
0.71
0.220.430.43
0.71
0.500.711.10
0.460.541.15
0.540.871.25
1.35
130 000
120 000
99 00099 000
69 000
69 00065 00061 000
63 00061 00059 000
56 000
59 00057 00057 000
53 000
53 00049 00048 000
49 00046 00045 000
47 00044 00042 000
39 000
150 000
140 000
120 000120 000
82 000
82 00078 00072 000
75 00072 00070 000
66 000
70 00067 00067 000
63 000
63 00059 00057 000
59 00055 00054 000
55 00052 00050 000
46 000
1
1.2
1.52
1.8
222.5
222.5
3
22.53
3
2.533.5
2.533.5
2.53.54
4
1.6
2.3
2.8 2.8
3.3
3.6 4.2 4.0
4.6 4.8 5.2
5.2
5.6 5.8 5.8
6.2
6.8 7.2 7.2
7.8 8.2 8.2
8.8 9.2 9.6
10.6
0.05
0.1
0.10.07
0.1
0.050.10.1
0.050.080.1
0.1
0.050.080.1
0.15
0.080.10.15
0.080.150.15
0.080.150.2
0.2
( ) ( )
( )( )
F681
F68/1.5
F682MLF2005
F68/2.5
MLF3006F683MLF3008
MLF4007MLF4008F684MLF4010
MLF5008MLF5009MLF5010F685
MLF6010MLF6012F686
MLF7011MLF7013F687
MLF8012MLF8014F688
F689
3.8
5
6.1 6.2
7.1
7.2 8.1 9.2
8.2 9.210.3
11.2
9.210.211.2
12.5
11.213.215
12.214.216
13.215.618
19
ー
5
6.1 6.2
7.1
7.2 8.1 ー
8.2 9.210.3
11.6
9.210.211.6
12.5
11.213.615
12.214.616
13.615.618
19
-
WF68/1.5 ZZ
WF682 ZZWMLF2005 ZZ
WF68/2.5 ZZ
WMLF3006 ZZWF683 ZZ -
WMLF4007 ZZXWMLF4008 ZZWF684 ZZWMLF4010 ZZ
WMLF5008 ZZXWMLF5009 ZZXWMLF5010 ZZWF685 ZZ
WMLF6010 ZZXWMLF6012 ZZWF686 ZZ
WMLF7011 ZZXWMLF7013 ZZWF687 ZZ
WMLF8012 ZZXWMLF8014 ZZWF688 ZZ
WF689 ZZ
0.03
0.1
0.10.2
0.2
0.20.40.6
0.30.50.7
1.1
0.40.61.0
1.1
0.71.42.1
0.81.52.4
0.92.03.6
3.9
ー
0.6
0.6 0.6
0.8
0.6 0.8 ー
0.6 0.6 1
0.8
0.6 0.6 0.8
1
0.6 0.8 1.1
0.6 0.8 1.1
0.8 0.8 1.1
1.1
0.3
0.4
0.5 0.6
0.5
0.6 0.5 0.6
0.6 0.6 0.6
0.6
0.6 0.6 0.6
0.8
0.6 0.6 1
0.6 0.6 1
0.6 0.8 1
1
B CB
r
r
φD φ φD r1
r1
1
1
1 φD2ZZ ZZX ZZL
d
C2 B
r1
r11
φD2
C2B
r1
r11
φD2
C2
rφd
�
a
a
Open type Shielded type
r�φda
a
d D B B1 r r1Cr Cor
(minー1)(mm)
D1 C2C1
Flange dimensions(mm)
da ra(mm) Full-size Drawing
Bearing number Mounting dimensions
(Refer.)
Mass
(g) Oil lub. Open type Shielded type
(max.)(Open type)
Basic load ratings Limiting speedsBoundary dimensions
Grease lub.Dynamic Static
(kN)
(min.)(min.)D2
Thin section series d 1~9 mm
Values in ( ) do not conform to JIS B 1521Notes 1)
2) MLF2005 and WMLF2005 ZZ correspond to former bearing numbers OBF11 and WOBF11 ZZ, respectively
Bearings with locating snapring on outer ring are alsoavailable. Consult KOYO
Deep Groove Ball Bearings with Flanges [ Metric Series ]
If, however, P0<Fr , assume P0=Fr
0.0140.0280.056
0.0840.110.17
0.280.420.56
0.190.220.26
0.280.300.34
0.380.420.44
1 0 0.56
2.301.991.71
1.551.451.31
1.151.041.00
X Y X Ye
P0=0.6F r+0.5Fa
P=XFr+YFa
≦ e > eC0Fa
FaFr
FaFr
Dynamic equivalent load
Static equivalent load
1) 1)
(min.)
2)
F68 / 1.5
F68 / 2.5
F681
F682
F683
F685
F688
F689
MLF4008
MLF6010
MLF4010
50 51
Miniature and Extra -small Ball Bearings
d 3~8 mmFN Bearings
3
4
5
6
7
8
78
89
910
101213
1113
121416
0.80.9
0.61
0.60.8
0.60.81.1
0.60.8
0.80.81.1
0.15 0.15
0.08 0.15
0.08 0.1
0.08 0.1 0.15
0.08 0.15
0.08 0.15 0.2
34
34
34
345
34
3.545
8.1 9.5
9.210.3
10.211.6
11.213.615
12.214.6
13.615.618
WFN683 ZZWFN693 ZZ
WMLFN4008 ZZWFN684 ZZ
WMLFN5009 ZZWMLFN5010 ZZ
WMLFN6010 ZZWMLFN6012 ZZWFN686 ZZ
WMLFN7011 ZZWMLFN7013 ZZ
WMLFN8012 ZZWMLFN8014 ZZWFN688 ZZ
0.310.55
0.400.64
0.380.50
0.500.711.10
0.430.82
0.570.871.60
66 00064 000
61 00059 000
56 00055 000
53 00049 00048 000
49 00047 000
47 00044 00042 000
0.50.9
0.61.0
0.71.2
0.81.72.6
0.92.1
1.12.13.9
0.110.17
0.130.23
0.170.21
0.220.290.44
0.230.38
0.300.420.71
4.24.2
4.85.2
5.85.8
6.87.27.2
7.88.2
8.89.29.6
0.10.15
0.080.1
0.080.1
0.080.10.15
0.080.15
0.080.150.2
2. Pull-out Strength of Flange
These values for the pull-out strength of the flange arevalid when an axial load is applied evenly to the wholecircumference of the flange. If the load is applied locally,the pull-out strength may decrease to approximately 10% of the C 0 value (C 0 denotes the basic static load ratingof bearing).
1. Application Conditions and Environment
Condition / Environment Operating range
Resistanceto axial load
65 % or less of C0
50 % or less of C0
130℃ max.
-30℃ min.
95 % RH max.
< 50℃
≧ 50℃
Heat resistance
Low temperature resistance
Moisture resistance
Pul
l-out
str
engt
h of
flan
ge
Temperature, ℃
B C
r
r
φD φ φD
1
1dr
φda
a
1.5
1
0.65
0.5
010 20 30 40 50 100 200
d D B ra(kN)
r (minー1)Cr Cor
(mm) Full-size Drawing
Bearing number Mounting dimensions (Refer.)
Mass
(g)Shielded type(min.) (max.)
da
Basic load ratings Limitingspeeds
Boundary dimensions
Grease lub.Dynamic Static
(mm)
(min.)
Flange dimensions
(mm)1)
D1 C12)
The tolerance for D1 is from + 0.125 to - 0.050 mm. This does not apply to the portion formed by the molding gateNotes 1) 2) The tolerance for C1 is from 0 to - 0.050 mm
Performance
Remark:
( )Assume that the basic static
load rating of bearing, C0 , is 1
Deep Groove Ball Bearings with Resin Flanges [ Metric Series ]
If, however, P0<Fr , assume P0=Fr
0.0140.0280.056
0.0840.110.17
0.280.420.56
0.190.220.26
0.280.300.34
0.380.420.44
1 0 0.56
2.301.991.71
1.551.451.31
1.151.041.00
X Y X Ye
P0=0.6F r+0.5Fa
P=XFr+YFa
≦ e > eC0Fa
FaFr
FaFr
Dynamic equivalent load
Static equivalent load
d 3~8 mm
Remark: Consult KOYO for flange dimensions and shapes which are not listed above
Note:
C0 denotes the basic static load rating of bearing
WFN683
WMLFN4008
WMLFN6010
WMLFN8012
WMLFN5009
WMLFN7011
52 53
Miniature and Extra -small Ball Bearings
(min.)d D B B 1 r1Shielded type
1.016
1.191
1.397
1.984
2.380
3.175
3.967
4.762
6.350
9.525
Cr Cor0.02
0.04
0.06
0.10
0.060.17
0.110.150.23
0.230.49
0.15
0.120.270.49
0.200.440.62
1.05
1.40
0.08
0.14
0.21
0.33
0.190.55
0.310.430.64
0.641.30
0.36
0.260.711.30
0.421.101.50
2.80
3.35
130 000
120 000
110 000
86 000
98 00064 000
66 00063 00059 000
59 00050 000
61 000
59 00056 00050 000
53 00048 00044 000
40 000
33 000
150 000
140 000
130 000
100 000
110 00076 000
79 00075 00070 000
70 00060 000
73 000
70 00066 00060 000
63 00057 00052 000
47 000
40 000
OB63
OB65
OB67
OB69
OB71OB72
OB74OB75OB76EE0EE1/2
OB79
OB81OB82EE1
OB87OB88EE11/2EE2
EE3
ー
WOB65 ZZX
WOB67 ZZX
WOB69 ZZX
WOB71 ZZXWOB72 ZZX
WOB74 ZZWOB75 ZZWOB76 ZZXEE0 ZZEE1/2 ZZX
WOB79 ZZX
WOB81 ZZXOB82 ZZXEE1S ZZ
OB87 ZZWOB88 ZZXEE11/2 ZZEE2S ZZ
EE3S ZZ
3.175
3.967
4.762
6.350
4.7627.938
6.3507.9389.525
9.52512.700
7.938
7.9389.52512.700
9.52512.70015.875
19.050
22.225
0.05
0.1
0.1
0.3
0.10.6
0.20.60.9
1.32.6
0.5
0.40.72.1
0.51.44.3
7.2
9.0
(minー1)
mm inch mm inch mm inch mm inch mm inch mm inch
0.0400
0.0469
0.0550
0.0781
0.0937
0.1250
0.1562
0.1875
0.2500
0.3750
0.1250
0.1562
0.1875
0.2500
0.18750.3125
0.25000.31250.37500.37500.5000
0.3125
0.31250.37500.5000
0.37500.50000.62500.7500
0.8750
1.191
1.588
1.984
2.380
1.5882.779
2.3802.7792.779
3.9674.366
2.779
2.7793.1753.967
3.1753.1754.978
5.558
5.558
0.0469
0.0625
0.0781
0.0937
0.06250.1094
0.09370.10940.10940.15620.1719
0.1094
0.10940.12500.1562
0.12500.12500.19600.2188
0.2188
ー
2.380
2.779
3.571
2.3803.571
2.7793.5713.571
3.9674.366
3.175
3.1753.1754.978
3.1754.7624.978
7.142
7.142
ー
0.0937
0.1094
0.1406
0.09370.1406
0.10940.14060.14060.15620.1719
0.1250
0.12500.12500.1960
0.12500.18750.19600.2812
0.2812
0.08
0.08
0.08
0.08
0.080.127
0.080.080.127
0.30.3
0.08
0.080.080.3
0.080.1270.3
0.4
0.4
0 .003
0 .003
0 .003
0 .003
0 .0030 .005
0 .0030 .0030 .0050 .0120 .012
0 .003
0 .0030 .0030 .012
0 .0030 .0050 .0120 .016
0 .016
ー
0.08
0.08
0.08
0.080.08
0.080.080.08
0.30.3
0.08
0.080.080.3
0.080.080.3
0.4
0.4
ー
0.003
0 .003
0 .003
0 .0030 .003
0 .0030 .0030 .0030 .0120 .012
0 .003
0 .0030 .0030 .012
0 .0030 .0030 .0120 .016
0 .016
r
OB, EEシリーズ
EE2
EE0
OB63
OB65
OB67
OB69
OB76
OB79
OB87
OB71
OB82
BBBBr
rφD φ r1 r1r1
r11 1 1 r1r1
ZZ ZZX ZZL
d
Open type Shielded type
Full-size Drawing
Boundary dimensions
(min.)
Basic load ratings
Dynamic Static Greaselub.
Oil lub.
Limiting speeds
Open type
Bearing number (Refer.)Mass(g)
(Open type)
OB and EE series d 1.016~9.525 mmDeep Groove Ball Bearings [ Inch Series ]
If, however, P0<Fr , assume P0=Fr
0.0140.0280.056
0.0840.110.17
0.280.420.56
0.190.220.26
0.280.300.34
0.380.420.44
1 0 0.56
2.301.991.71
1.551.451.31
1.151.041.00
X Y X Ye
P0=0.6F r+0.5Fa
P=XFr+YFa
≦ e > eC0Fa
FaFr
FaFr
Dynamic equivalent load
Static equivalent load
(kN)
54 55
Miniature and Extra -small Ball Bearings
56 57
d D B B 1 r 1
1.191
1.397
1.984
2.380
3.175
3.967
4.762
6.350
7.938
9.525
Cr Cor0.03
0.07
0.10
0.060.17
0.110.180.23
0.23
0.15
0.150.270.48
0.170.440.62
0.28
1.40
0.11
0.23
0.28
0.190.55
0.310.560.64
0.64
0.36
0.360.711.30
0.371.101.50
0.54
3.35
120 000
110 000
67 000
97 00064 000
67 00063 00059 000
59 000
59 000
59 00056 00050 000
53 00048 00044 000
46 000
33 000
140 000
130 000
80 000
110 00076 000
80 00075 00070 000
70 000
71 000
71 00066 00060 000
63 00057 00052 000
55 000
40 000
OBF65
OBF67
OBF69
OBF71OBF72
OBF74OBF75OBF76OBF77
OBF79
OBF81OBF82OBF84
OBF87OBF88OBF89
OBF92
OBF93
WOBF65 ZZX
WOBF67 ZZX
WOBF69 ZZX
WOBF71 ZZXWOBF72 ZZX
WOBF74 ZZXWOBF75 ZZWOBF76 ZZXOBF77 ZZX
WOBF79 ZZX
WOBF81 ZZXOBF82 ZZXOBF84 ZZ
OBF87 ZZXWOBF88 ZZXOBF89 ZZ
OBF92 ZZX
WOBF93 ZZ
3.967
4.762
6.350
4.7627.938
6.3507.9389.525
9.525
7.938
7.9389.52512.700
9.52512.70015.875
12.700
22.225
0.1
0.2
0.4
0.1 0.7
0.3 0.7 1.0
1.5
0.6
0.5 0.8 2.8
0.6 1.6 5.8
1.8
12
(kN)
mm inch mm inch mm inchmm inch mm inchmm inch
0.0469
0.0550
0.0781
0.0937
0.1250
0.1562
0.1875
0.2500
0.3125
0.3750
0.1562
0.1875
0.2500
0.18750.3125
0.25000.31250.37500.3750
0.3125
0.31250.37500.5000
0.37500.50000.6250
0.5000
0.8750
1.588
1.984
2.380
1.5882.779
2.3802.7792.779
3.967
2.779
2.7793.1754.978
3.1753.1754.978
3.967
5.558
0.0625
0.0781
0.0937
0.06250.1094
0.09370.10940.10940.1562
0.1094
0.10940.12500.1960
0.12500.12500.1960
0.1562
0.2188
2.380
2.779
3.571
2.3803.571
2.7793.5713.571
3.967
3.175
3.1753.1754.978
3.1754.7624.978
3.967
7.142
0.0937
0.1094
0.1406
0.09370.1406
0.10940.14060.14060.1562
0.1250
0.12500.12500.1960
0.12500.18750.1960
0.1562
0.2812
0.08
0.08
0.08
0.080.127
0.080.080.127
0.3
0.08
0.080.080.3
0.080.1270.3
0.127
0.4
0.003
0.003
0.003
0.0030.005
0.0030.0030.0050.012
0.003
0.0030.0030.012
0.0030.0050.012
0.005
0.016
0.08
0.08
0.08
0.080.08
0.080.080.08
0.3
0.08
0.080.080.3
0.080.080.3
0.08
0.4
0.003
0.003
0.003
0.0030.003
0.0030.0030.0030.012
0.003
0.0030.0030.012
0.0030.0030.012
0.003
0.016
r
mm inchmm inch mm inchC 1 C 2D 1・ D 2
5.156
5.944
7.518
5.9449.119
7.5189.11910.719
11.176
9.119
9.11910.71914.351
10.71913.89417.526
13.894
24.613
0 .203
0 .234
0 .296
0 .2340 .359
0 .2960 .3590 .4220 .440
0 .359
0 .3590 .4220 .565
0 .4220 .5470 .690
0 .547
0 .969
0.330
0.584
0.584
0.4570.584
0.5840.5840.584
0.762
0.584
0.5840.5841.067
0.5840.5841.067
0.787
1.575
0.013
0.023
0.023
0.0180.023
0.0230.0230.0230.030
0.023
0.0230.0230.042
0.0230.0230.042
0.031
0.062
0.787
0.787
0.787
0.7870.787
0.7870.7870.787
0.762
0.914
0.9140.7871.067
0.9141.1431.067
0.787
1.575
0 .031
0 .031
0 .031
0 .0310 .031
0 .0310 .0310 .0310 .030
0 .036
0 .0360 .0310 .042
0 .0360 .0450 .042
0 .031
0 .062
Flange dimensions
OBF65
OBF92
OBF87
OBF84
OBF79
OBF76
OBF72
OBF71
OBF69
OBF67
OBF93
B CBBB
r
r
φD φ φD r1 r1r1
r1 r1r1
1
1 11
1 φD2 φD2 φD2ZZ ZZX ZZL
d
C2 C2C2
Open type Shielded type
Full-size Drawing
Boundary dimensions
(min.) (min.)
Basic load ratings
Dynamic Static
(minー1)Grease
lub.Oil
lub.
Limiting speeds Bearing number
Shieldedtype
Opentype
(Refer.)Mass(g)
(Open type)
OBF series d 1.191~9.525 mm
Bearings with locating snapring on outer ring are alsoavailable. Consult KOYO
Deep Groove Ball Bearings with Flanges [ Inch Series ]
If, however, P0<Fr , assume P0=Fr
0.0140.0280.056
0.0840.110.17
0.280.420.56
0.190.220.26
0.280.300.34
0.380.420.44
1 0 0.56
2.301.991.71
1.551.451.31
1.151.041.00
X Y X Ye
P0=0.6F r+0.5Fa
P=XFr+YFa
≦ e > eC0Fa
FaFr
FaFr
Dynamic equivalent load
Static equivalent load
58
(1) Metric Series, Open Type
1
1.2
1.5
2
2.5
3
4
5
681ML1003691
ML1204
68 / 1.569 / 1.5ML1506
682ML2005692
ML2006ML2007602
68 / 2.569 / 2.5ML2508 / 1B
ML2508
ML3006683ML3008
693603623
633
ML4007ML4008684
ML4010694604
624634
ML5008ML5009ML5010
685695605
625635
681MR31691
MR41 X
681 X691 X601 X
682MR52692
MR62MR72602
682 X692 XMR82 X
602 X
MR63683MR83
693603623
633
MR74MR84684
MR104694604
624634
MR85MR95MR105
685695605
625635
L - 310L - 310W51R - 410
R - 412
L - 415R - 515R - 615
L - 520L - 520W02R - 620
R - 620W52R - 720Y52R - 720
L - 625R - 725R - 825Y52
R - 825
L - 630L - 730R - 830Y52
R - 830R - 930R - 1030
ー
L - 740L - 840L - 940
L - 1040R - 1140R - 1240
R - 1340R - 1640
L - 850L - 950L - 1050
L - 1150R - 1350R - 1450
R - 1650R - 1950
6
7
8
9
ML6010ML6012686
696606626
636
ML7011ML7013687
697607627
637
ML8012ML8014688
698608628
638
689699609
629639
MR106MR126686
696606626
636
MR117MR137687
697607627
637
MR128MR148688
698608628
638
689699609
629639
L - 1060L - 1260L - 1360
R - 1560R - 1760R - 1960
ー
L - 1170L - 1370L - 1470
ーR - 1970R - 2270
ー
L - 1280L - 1480L - 1680
R - 1980R - 2280ー
ー
L - 1790L - 2090ー
ーー
KOYO NSK NMB KOYO NSK NMB
Supplementary Table 1 Bearing Number Correspondence Table
Bore diameter
(mm)Bore diameter
(mm)
Supplementary Table 1 (1) Bearing Number Correspondence Table
59
Miniature and Extra -small Ball Bearings
1.5
2
2.5
3
4
5
6
691 XZZ601 XZZS
682 ZZMR52 ZZ692 ZZ
MR62 ZZSMR72 ZZS602 ZZS
682 XZZS692 XZZ602 XZZS
MR63 ZZ683 ZZ693 ZZ
623 ZZ633 ZZ
MR74 ZZSMR84 ZZ684 ZZ
MR104 ZZ694 ZZ604 ZZ
624 ZZ634 ZZ
MR85 ZZSMR95 ZZSMR105 ZZ
685 ZZ695 ZZ605 ZZ
625 ZZ635 ZZ
MR106 ZZSMR126 ZZ686 ZZ
696 ZZ606 ZZ626 ZZ
636 ZZ
R - 515 ZZR - 615 ZZ
L - 520 ZZL - 520 ZZW52R - 620 ZZ
R - 620ZZY52R - 720ZZY03R - 720 ZZ
L - 625 ZZR - 725 ZZR - 825 ZZ
L - 630 ZZL - 730 ZZR - 830 ZZ
R - 1030 ZZ ー
L - 740X2 ZZL - 840 ZZL - 940 ZZ
L - 1040 ZZR - 1140 ZZR - 1240 ZZ
R - 1340 ZZR - 1640 ZZ
L - 850 ZZL - 950X2 ZZL - 1050 ZZ
L - 1150 ZZR - 1350 ZZR - 1450 ZZ
R - 1650 ZZR - 1950 ZZ
L - 1060 ZZL - 1260 ZZL - 1360 ZZ
R - 1560 ZZR - 1760 ZZR - 1960 ZZ
ー
7
8
9
WML7011 ZZXWML7013 ZZW687 ZZ
697 ZZ607 ZZ627 ZZ
637 ZZ
WML8012 ZZWML8014 ZZW688 ZZ
698 ZZ608 ZZ628 ZZ
638 ZZ
W689 ZZ699 ZZ609 ZZ
629 ZZ639 ZZ
MR117 ZZSMR137 ZZS687 ZZ
697 ZZ607 ZZ627 ZZ
637 ZZ
MR128 ZZSMR148 ZZ688 ZZ
698 ZZ608 ZZ628 ZZ
638 ZZ
689 ZZ699 ZZ609 ZZ
629 ZZ639 ZZ
L - 1170 ZZL - 1370 ZZL - 1470 ZZ
ーR - 1970 ZZR - 2270 ZZ
ー
L - 1280 ZZL - 1480 ZZL - 1680 ZZ
R - 1980 ZZR - 2280 ZZ
ー
ー
L - 1790 ZZL - 2090 ZZ
ー
ーー
KOYO NSK NMB KOYO NSK NMB
W69 / 1.5 ZZXWML1506 ZZX
W682 ZZXWML2005 ZZW692 ZZ
WML2006 ZZXWML2007 ZZXW602 ZZX
W68 / 2.5 ZZW69 / 2.5 ZZWML2508 ZZX
WML3006 ZZW683 ZZW693 ZZ
623 ZZ633 ZZ
WML4007 ZZWML4008 ZZW684 ZZ
WML4010 ZZ694 ZZ604 ZZ
624 ZZ634 ZZ
WML5008 ZZWML5009 ZZWML5010 ZZ
W685 ZZ695 ZZ605 ZZ
625 ZZ635 ZZ
WML6010 ZZWML6012 ZZW686 ZZ
696 ZZ606 ZZ626 ZZ
636 ZZ
ZX or Z ZS or Z Z
Bore diameter
(mm)
Bore diameter
(mm)
Code of single-shielded type
(2) Metric Series, Shielded Type
Supplementary Table 1 (2) Bearing Number Correspondence Table
60
1
1.5
2
2.5
3
4
5
F681F691
F68 / 1.5F69 / 1.5MLF1506
F682MLF2005F692
MLF2006MLF2007F602
F68 / 2.5F69 / 2.5MLF2508 / 1B
MLF2508
MLF3006F683MLF3008
F693F603F623
MLF4007MLF4008F684
MLF4010F694F604
F624F634
MLF5008MLF5009MLF5010
F685F695F605
F625F635
F681F691
F681XF691XF601X
F682MF52F692
MF62MF72F602
F682XF692XMF82X
F602X
MF63F683MF83
F693F603F623
MF74MF84F684
MF104F694F604
F624F634
MF85MF95MF105
F685F695F605
F625F635
LF - 310RF - 410
LF - 415RF - 515RF - 615
LF - 520 ーRF - 620
RF - 620W52RF - 720Y52RF - 720
LF - 625RF - 725RF - 825Y52
RF - 825
LF - 630LF - 730RF - 830Y52
RF - 830RF - 930RF-1030
LF - 740LF - 840LF - 940
LF - 1040RF - 1140RF - 1240
RF - 1340RF - 1640
LF - 850LF - 950LF - 1050
LF - 1150RF - 1350RF - 1450
RF - 1650RF - 1950
6
7
8
9
MLF6010MLF6012F686
F696F606F626
MLF7011MLF7013F687
F697F607F627
MLF8012MLF8014F688
F698F608
F689F699
MF106MF126F686
F696F606F626
MF117MF137F687
F697F607F627
MF128MF148F688
F698F608
F689F699
LF - 1060LF - 1260LF - 1360
RF - 1560RF - 1760RF - 1960
LF - 1170LF - 1370LF - 1470
ーー
RF - 2270
LF - 1280LF - 1480LF - 1680
RF - 1980RF - 2280
LF - 1790ー
KOYO NSK NMB KOYO NSK NMBBore diameter
(mm)Bore diameter
(mm)
Supplementary Table 1 Bearing Number Correspondence Table
(3) Metric Series, Flanged Type
Supplementary Table 1 (3) Bearing Number Correspondence Table
61
Miniature and Extra -small Ball Bearings
1.5
2
2.5
3
4
5
6
F691 XZZF601 XZZS
F682 ZZMF52 ZZSF692 ZZ
MF72 ZZF602 ZZS
F682 XZZSF692 XZZF602 XZZS
MF63 ZZSF683 ZZF693 ZZ
F623 ZZ
MF74 ZZSMF84 ZZF684 ZZ
MF104 ZZF694 ZZF604 ZZ
F624 ZZF634 ZZ
MF85 ZZSMF95 ZZSMF105 ZZ
F685 ZZF695 ZZF605 ZZ
F625 ZZF635 ZZ
MF106 ZZSMF126 ZZF686 ZZ
F696 ZZF606 ZZF626 ZZ
RF - 515 ZZRF - 615 ZZ
LF - 520 ZZ ーRF - 620 ZZ
RF - 720Y03RF - 720 ZZ
LF - 625 ZZRF - 725 ZZRF - 825 ZZ
LF - 630 ZZLF - 730 ZZRF - 830 ZZ
RF - 1030 ZZ
LF - 740 ZZLF - 840 ZZLF - 940 ZZ
LF - 1040 ZZRF - 1140 ZZRF - 1240 ZZ
RF - 1340 ZZRF - 1640 ZZ
LF - 850 ZZLF - 950 ZZLF - 1050 ZZ
LF - 1150 ZZRF - 1350 ZZRF - 1450 ZZ
RF - 1650 ZZRF - 1950 ZZ
LF - 1060 ZZLF - 1260 ZZLF - 1360 ZZ
RF - 1560 ZZRF - 1760 ZZ ー
7
8
9
WMLF7011 ZZXWMLF7013 ZZWF687 ZZ
F697 ZZF607 ZZF627 ZZ
WMLF8012 ZZXWMLF8014 ZZWF688 ZZ
F698 ZZF608 ZZ
WF689 ZZF699 ZZ
MF117 ZZSMF137 ZZSF687 ZZ
F697 ZZF607 ZZF627 ZZ
MF128 ZZSMF148 ZZF688 ZZ
F698 ZZF608 ZZ
F689 ZZF699 ZZ
LF - 1170 ZZLF - 1370 ZZLF - 1470 ZZ
ーー
RF - 2270 ZZ
LF - 1280 ZZLF - 1480 ZZLF - 1680 ZZ
ーRF - 2280 ZZ
LF - 1790 ZZー
KOYO NSK NMB KOYO NSK NMB
WF69 / 1.5 ZZWMLF1506 ZZ
WF682 ZZWMLF2005 ZZWF692 ZZ
WMLF2007 ZZWF602 ZZ
WF68 / 2.5 ZZWF69 / 2.5 ZZXWMLF2508 ZZ
WMLF3006 ZZWF683 ZZWF693 ZZ
F623 ZZ
WMLF4007 ZZXWMLF4008 ZZWF684 ZZ
WMLF4010 ZZF694 ZZF604 ZZ
F624 ZZF634 ZZ
WMLF5008 ZZXWMLF5009 ZZXWMLF5010 ZZ
WF685 ZZF695 ZZF605 ZZ
F625 ZZF635 ZZ
WMLF6010 ZZXWMLF6012 ZZWF686 ZZ
F696 ZZF606 ZZF626 ZZ
Bore diameter
(mm)
Bore diameter
(mm)
ZX or Z ZS or Z ZCode of single-shielded type
(4) Metric Series, Flanged, and Shielded Type
Supplementary Table 1 (4) Bearing Number Correspondence Table
62
Supplementary Table 1 Bearing Number Correspondence Table
1.0161.1911.3971.9842.380
3.175
3.9674.762
6.350
7.9389.525
OB63
OB65
OB67
OB69
OB71OB72
OB74OB75OB76
EE0EE1/2
OB79
OB81OB82EE1
OB87OB88EE11/2
EE2
OB92
EE3
KOYO NSK NMB BARDEN MPB
R 09
R 0
R 1
R 1 - 4
R 133R 1 - 5
R 144R 2 - 5R 2 - 6
R 2R 2A
R 155
R 156R 166R 3
R 168R 188R 4
R 4A
R 1810
R 6
RI - 2
RI - 21/2
RI - 3
RI - 4
RI - 3332RI - 5
RI - 418RI - 518RI - 618
R - 2 ー
RI - 5532
RI - 5632RI - 6632R - 3
RI - 614RI - 814R - 4
RI - 1214
RI - 8516
RI - 1438
ー
R 0
R 1
R 1 - 4
R 133R 1 - 5
R 144R 2 - 5R 2 - 6
R 2R 2A
R 155
R 156R 166R 3
R 168R 188R 4
R 4A
R 1810
R 6
2 C
21/2 C
3 C
4 C
3332 C5 C
418 C518 C618 C
R 2 CR 2A C
5532 C
5632 C6316 CR 3 C
614 C814 CR 4 C
R 4AR
8516 C
R 6 R
Bore diameter
(mm)
1.1911.3971.9842.380
3.175
3.9674.762
6.350
7.9389.525
WOB65 ZZX
WOB67 ZZX
WOB69 ZZX
WOB71 ZZXWOB72 ZZX
WOB74 ZZWOB75 ZZWOB76 ZZX
EE0 ZZEE1/2 ZZX
WOB79 ZZX
WOB81 ZZXOB82 ZZXEE1S ZZ
OB87 ZZWOB88 ZZXEE11/2 ZZ
EE2S ZZ
OB92 ZZX
EE3S ZZ
KOYO NSK NMB BARDEN MPB
R 0 ZZS
R 1 ZZS
R 1 - 4 ZZS
R 133 ZZSR 1 - 5 ZZS
R 144 ZZR 2 - 5 ZZR 2 - 6 ZZS
R 2 ZZR 2A ZZ
R 155 ZZS
R 156 ZZSR 166 ZZR 3 ZZ
R 168 ZZSR 188 ZZR 4 ZZ
R 4A ZZ
R 1810 ZZS
R 6 ZZ
RI - 21/2 ZZ
RI - 3 ZZ
RI - 4 ZZ
RI - 3332 ZZRI - 5 ZZ
RI - 418 ZZRI - 518 ZZRI - 618 ZZ
R - 2 ZZ ー
RI - 5532 ZZ
RI - 5632 ZZRI - 6632 ZZR - 3 ZZ
RI - 614 ZZRI - 814 ZZR - 4 ZZ
RI - 1214 ZZ
RI - 8516 ZZ
RI - 1438 ZZ
R 0 SS
R 1 SS
R 1 - 4 SS
R 133 SSR 1 - 5 SS
R 144 SSR 2-5 SSR 2-6 SS
R 2 SSR 2A SS
R 155 SS
R 156 SSR 166 SSR 3 SS
R 168 SSR 188 SSR 4 SS
R 4A SS
R 1810 SS
R 6 SS
21/2 CHH
3 CHH
4 CHH
3332 CHH5 CHH
418 CHH518 CHH618 CHH
R 2 CHHR 2A CHH
5532 CHH
5632 CHH6316 CHHR 3 CHH
614 CHH814 CHHR 4 CHH
R 4A RHH
8516 CHH
R 6 RHH
Bore diameter(mm)
Op
en T
ype
Sh
ield
ed T
ype
(5) Inch Series
Supplementary Table 1 (5) Bearing Number Correspondence Table
63
Miniature and Extra -small Ball Bearings
1.1911.3971.9842.380
3.175
3.9674.762
6.350
7.9389.525
OBF65
OBF67
OBF69
OBF71OBF72
OBF74OBF75OBF76
OBF77
OBF79
OBF81OBF82OBF84
OBF87OBF88OBF89
OBF92
OBF93
KOYO NSK NMB BARDEN MPB
FR 0
FR 1
FR 1 - 4
FR 133FR 1 - 5
FR 144FR 2 - 5FR 2 - 6
FR 2
FR 155
FR 156FR 166FR 3
FR 168FR 188FR 4
FR 1810
FR 6
RIF - 21/2
RIF - 3
RIF - 4
RIF - 3332RIF - 5
RIF - 418RIF - 518RIF - 618
RF - 2
RIF - 5532
RIF - 5632RIF - 6632 ー
RIF - 614RIF - 814RF - 4
RIF - 8516
ー
FR 0
FR 1
FR 1 - 4
FR 133FR 1 - 5
FR 144FR 2 - 5FR 2 - 6
FR 2
FR 155
FR 156FR 166FR 3
FR 168FR 188FR 4
FR 1810
ー
21/2 FC
3 FC
4 FC
3332 FC5 FC
418 FC518 FC618 FC
R2 FC
5532 FC
5632 FC6316 FC ー
614 FC814 FCR 4 FC
8516 FC
ー
1.1911.3971.9842.380
3.175
3.9674.762
6.350
7.9389.525
WOBF65 ZZX
WOBF67 ZZX
WOBF69 ZZX
WOBF71 ZZXWOBF72 ZZX
WOBF74 ZZXWOBF75 ZZWOBF76 ZZX
WOBF77 ZZX
WOBF79 ZZX
WOBF81 ZZXWOBF82 ZZXWOBF84 ZZ
WOBF87 ZZXWOBF88 ZZXWOBF89 ZZ
OBF92 ZZX
WOBF93 ZZ
KOYO NSK NMB BARDEN MPB
FR 0 ZZS
FR 1 ZZS
FR 1 - 4 ZZS
FR 133 ZZSFR 1 - 5 ZZS
FR 144 ZZFR 2 - 5 ZZFR 2 - 6 ZZS
FR 2 ZZ
FR 155 ZZS
FR 156 ZZSFR 166 ZZFR 3 ZZ
FR 168 ZZSFR 188 ZZFR 4 ZZ
FR 1810 ZZS
FR 6 ZZ
RIF - 21/2 ZZ
RIF - 3 ZZ
RIF - 4 ZZ
RIF - 3332 ZZRIF - 5 ZZ
RIF - 418 ZZRIF - 518 ZZRIF - 618 ZZ
RF - 2 ZZ
RIF - 5532 ZZ
RIF - 5632 ZZRIF - 6632 ZZRF - 3 ZZ
RIF - 614 ZZRIF - 814 ZZRF - 4 ZZ
RIF - 8516 ZZ
RIF - 1438 ZZ
FR 0 SS
FR 1 SS
FR 1 - 4 SS
FR 133 SSFR 1 - 5 SS
FR 144 SSFR 2 - 5 SSFR 2 - 6 SS
FR 2 SS
FR 155 SS
FR 156 SSFR 166 SSFR 3 SS
FR 168 SSFR 188 SSFR 4 SS
FR 1810 SS
FR 6 SS
21/2 FCHH
3 FCHH
4 FCHH
3332 FCHH5 FCHH
418 FCHH518 FCHH618 FCHH
R 2 FCHH
5532 FCHH
5632 FCHH6316 FCHHR 3 FCHH
614 FCHH814 FCHHR 4 FCHH
8516 FCHH
R 6 FCHH
Op
en T
ype
Bore diameter
(mm)
Bore diameter(mm)
Sh
ield
ed T
ype
(6) Inch Series, Flanged Type
Supplementary Table 1 (6) Bearing Number Correspondence Table
Miniature and Extra -small Ball BearingsSupplementary Table 2 Shaft Tolerances
+
+
+ +
+ +
+ +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
2010 27 15 34 19 41 23 49 28 59 34 71 41 73 43 86 51 89 54 103 63 105 65 108 68123 77 126 80 130 84146 94 150 98 165 108171 114 189 126 195 132 220 150 225155255175265 185 300 210 310 220
ー
3
6
10
18
30
50
65
80
100
120
140
160
180
200
225
250
280
315
355
400
450
500
560
630
710
800
900
3
6
10
18
30
50
65
80
100
120
140
160
180
200
225
250
280
315
355
400
450
500
560
630
710
800
900
1 000
0 8 0 8 0 8 0 8 0 10 0 12
0 15
0 20
0 25
0 30
0 35
0 40
0 45
0 50
0 75
0 100
6 0 9 110 112 115 218 2
21 2
25 3
28 3
33 4
36 4
40 4
455
44 0
50 0
56 0
6 2 9 412 615 717 820 9
2411
2813
3315
3717
4320
4621
5023
8 212 415 618 721 825 9
3011
3513
4015
4617
5220
5721
6323
7026
8030
9034
12 2 16 4 21 6 25 7 29 8 34 9
41 11
48 13
55 15
63 17
72 20
78 21
86 23
96 26
110 30
124 34
8 413 81610201224152817
3320
3823
4527
5131
5734
6237
6740
10 4 16 8 19 10 23 12 28 15 33 17
39 20
45 23
52 27
60 31
66 34
73 37
80 40
88 44
100 50
112 56
12 6 20 12 24 15 29 18 35 22 42 26
51 32
59 37
68 43
79 50
88 56
98 62
108 68
122 78
138 88
156100
k 5 k 6 k 7 m 5 m 6 m 7 n 5 n 6 p 6 r 6 r 7
(mm)
(Refer.)
⊿dmp1)of
bearing(class 0)
2)16102315281934234128503460416243735176548863906593681067710980113841269413098144108150114166126172132194150199155225175235185266210276220
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ +
+ +
+ +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
ー
ー
ー
+
+
+ +
+ +
+ +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
ー
ー
ー
+
+ +
+ +
+ +
+ +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ +
+ +
+ +
+ +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ +
+ +
+ +
+ +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ +
+ +
+ +
+ +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
ー
ー
ー
+
+ +
+ +
+ +
+ +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ +
+ +
+ +
+ +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
4 0 6 1 7 1 9 111 213 2
15 2
18 3
21 3
24 4
27 4
29 4
32 5
10 0131161191232272
32 2
38 3
43 3
50 4
56 4
61 4
68 5
70 0
80 0
90 0
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
3
6
10
18
30
50
80
120
180
250
315
400
500
630
800
3
6
10
18
30
50
80
120
180
250
315
400
500
630
800
1 000
14 20 20 28 25 34 32 43 40 53 50 66
60 79
72 94
85110
100129
110142
125161
135175
145 189
160210
170226
6 12 10 18 13 22 16 27 20 33 25 41
30 49
36 58
43 68
50 79
56 88
62 98
68 108
76 120
80 130
86 142
2 6 4 9 5 11 6 14 7 16 9 20
10 23
12 27
14 32
15 35
17 40
18 43
20 47
2 8 4 12 5 14 6 17 7 20 9 25
10 29
12 34
14 39
15 44
17 49
18 54
20 60
22 66
24 74
26 82
0 4 0 5 0 6 0 8 0 9011
013
015
018
020
023
025
027
0 6 0 8 0 9011013016
019
022
025
029
032
036
040
044
050
056
010012015018021025
030
035
040
046
052
057
063
070
080
090
0 25 0 30 0 36 0 43 0 52 0 62
0 74
0 87
0100
0115
0130
0140
0155
0175
0200
0230
0 40 0 48 0 58 0 70 0 840100
0120
0140
0160
0185
0210
0230
0250
0280
0320
0360
2
2.5
3
4
4.5
5.5
6.5
7.5
9
10
11.5
12.5
13.5
3
4
4.5
5.5
6.5
8
9.5
11
12.5
14.5
16
18
20
22
25
28
5
6
7
9
10
12
15
17
20
23
26
28
31
35
40
45
2 3 2 4 2 5 3 5 4 6 5
6 7
6 9
711
713
716
718
720
4 2 6 2 7 2 8 3 9 411 5
12 7
13 9
1411
1613
16
18
20
d 6 e 6 f 6 g 5 g 6 h 5 h 6 h 7 h 8 h 9 h 10 j s 5 j s 6 j s 7 j 5 j 6
Nominal shaft dia.(mm)
Deviation classes of shaft diameter
202630384049506165788096
100119
120142
145170
170199
190222
210246
230270
260304
290340
320376
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
0 14 0 18 0 22 0 27 0 33 0 39
0 46
0 54
0 63
0 72
0 81
0 89
0 97
0110
0125
0140
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
±
±
±
±
±
±
±
±
±
±
±
±
±
ー
ー
ー
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
+
ー +
ー +
ー +
ー +
ー
+
ー
+
ー
+
ー
+
ー
+
ー
+
ー
+
ー
ー
ー
ー
+
ー +
ー +
ー +
ー +
ー
+
ー
+
ー
+
ー
+
ー
+
ー
±
±
±
ー
ー
ー
over up to over up to
Unit μm
Supplementary Table 2 Shaft Tolerances (deviation from nominal dimensions)
Nominal shaft dia.
⊿dmp ; single plane mean bore diameter deviation These shall be applied to bearings with a nominal bore diameter 0.6 mm and more
Notes 1)2)
64 65
Miniature and Extra -small Ball BearingsSupplementary Table 3 Housing Bore Tolerances
ー
ー ー
ー ー
ー ー
ー ー
ー ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
ー
10 20 11 23 13 28 16 34 20 41 25 50 30 60 32 62 38 73 41 76 48 88 50 90 53 93 60106 63109 67113 74126 78130 87144 93150103166109172150220155225175255185265210300220310250355260365
ー
3
6
10
18
30
50
65
80
100
120
140
160
180
200
225
250
280
315
355
400
450
500
560
630
710
800
900
1 000
1 120
K 5 K 6 K 7 M 5 M 6 M 7 N 5 N 6 N 7 P 6 P 7
(mm)
3
6
10
18
30
50
65
80
100
120
140
160
180
200
225
250
280
315
355
400
450
500
560
630
710
800
900
1 000
1 120
1 250
R 7
0 4 0 5 1 5 2 6 1 8 2 9
310
213
315
218
320
322
225
0 6 2 6 2 7 2 9 211 313
415
418
421
524
527
729
832
044
050
056
066
2 6 3 8 410 412 514 516
619
823
927
1131
1336
1439
1643
2 8 0 12 0 15 0 18 0 21 0 25
0 30
0 35
0 40
0 46
0 52
0 57
0 63
26 96
30110
34124
40145
2 8 1 9 3 12 4 15 4 17 4 20
5 24
6 28
8 33
8 37
9 41
10 46
10 50
26 70
30 80
34 90
40106
4 8 712 814 917 12211324
1528
1833
2139
2545
2750
3055
3360
4 10 5 13 7 16 9 20 11 24 12 28
14 33
16 38
20 45
22 51
25 57
26 62
27 67
44 88
50100
56112
66132
4 14 4 16 4 19 5 23 7 28 8 33
9 39
10 45
12 52
14 60
14 66
16 73
17 80
44114
50130
56146
66171
6 12 9 17 12 21 15 26 18 31 21 37
26 45
30 52
36 61
41 70
47 79
51 87
55 95
78122
88138
100156
120186
6 16 8 20 9 24 11 29 14 35 17 42
21 51
24 59
28 68
33 79
36 88
41 98
45108
78148
88168
100190
120225
ー
ー +
ー +
ー +
ー
+
ー
+
ー
+
ー
+
ー
+
ー
+
ー
+
ー
+
ー
ー
ー
ー
ー
ー +
ー +
ー +
ー +
ー
+
ー
+
ー
+
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0 18
0 25
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2) 0 10 3 9 5 10 6 12 6 15 7 18
9 21
10 25
12 28
13 33
16 36
17 40
18 45
0 70
0 80
0 90
0105
ー
ー
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ー
3
6
10
18
30
50
80
120
180
250
315
400
500
630
800
1 000
3
6
10
18
30
50
80
120
180
250
315
400
500
630
800
1 000
1 250
(mm)
20 14 28 20 34 25 43 32 53 40 66 50
79 60
94 72
110 85
129100
142110
161125
175135
189145
210160
226170
261195
4 6
6
8 710 8 12 91411
1812
2213
2614
3016
3616
3918
4320
E 6 F 6 F 7 G 6 G 7 H 6 H 7 H 8 H 9 H 10 J 6 J 7 JS 5 JS 6 JS 7
12 6 18 10 22 13 27 16 33 20 41 25
49 30
58 36
68 43
79 50
88 56
98 62
108 68
120 76
130 80
142 86
164 98
16 6 22 10 28 13 34 16 41 20 50 25
60 30
71 36
83 43
96 50
108 56
119 62
131 68
146 76
160 80
176 86
203 98
8 212 414 517 620 725 9
2910
3412
3914
4415
4917
5418
6020
6622
7424
8226
9428
6 0 8 0 9 0110 130160
190
220
250
290
320
360
400
440
500
560
660
10 0 12 0 15 0 18 0 21 0 25 0
30 0
35 0
40 0
46 0
52 0
57 0
63 0
70 0
80 0
90 0
105 0
14 0 18 0 22 0 27 0 33 0 39 0
46 0
54 0
63 0
72 0
81 0
89 0
97 0
110 0
125 0
140 0
165 0
25 0 30 0 36 0 43 0 52 0 62 0
74 0
87 0
1000
1150
1300
1400
1550
1750
2000
2300
2600
40 0 48 0 58 0 70 0 84 01000
1200
1400
1600
1850
2100
2300
2500
2800
3200
3600
4200
2 4 5 3 5 4 6 5 8 510 6
13 6
16 6
18 7
22 7
25 7
29 7
33 7
3
4
4.5
5.5
6.5
8
9.5
11
12.5
14.5
16
18
20
22
25
28
33
5
6
7
9
10
12
15
17
20
23
26
28
31
35
40
45
52
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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+
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+
+
+
+
+
+
+
+
+
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+
+
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+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
12 2 16 4 20 5 24 6 28 7 34 9
40 10
47 12
54 14
61 15
69 17
75 18
83 20
92 22
104 24
116 26
133 28
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
ー +
ー +
ー +
ー +
ー
+
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+
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+
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+
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+
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+
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+
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+
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ー
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ー
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ー
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±
±
±
±
±
±
±
±
±
±
±
±
±
+
ー ± +
ー +
ー +
ー
+
ー
+
ー
+
ー
+
ー
+
ー
+
ー
+
ー
+
ー
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
2
2.5
3
4
4.5
5.5
6.5
7.5
9
10
11.5
12.5
13.5
over up to over up to
Unit μm
Supplementary Table 3 Housing Bore Tolerances (deviation from nominal dimensions)
(Refer.)
⊿Dmp1)of
bearing(class 0)
Nominal bore dia. Deviation classes of housing bore Nominal bore dia.
(up to150)
(over150)
0 8 0 8 0 8 0 8 0 9 0 11
0 13
0 15
0 30
0 35
0 40
0 45
0 50
0 75
0 100
0 125
Notes 1) ⊿Dmp ; single plane mean outside diameter deviation 2) These shall be applied to bearings with a nominal outside diameter 2.5 mm and more66 67
68
Supplementary Table 4 Numerical Values for Standard Tolerance Grades IT
Supplementary Table 5 Prefixes used with SI Units
Supplementary Table 4 Numerical Values for Standard Tolerance Grades IT
69
Miniature and Extra -small Ball Bearings
Supplementary Table 6 (1 ) SI Units and Conversion Factors
70
Supplementary Table 6 (2) SI Units and Conversion Factors
Supplementary Table 6 SI Units and Conversion Factors
71
Miniature and Extra -small Ball Bearings
Supplementary Table 6 (3) SI Units and Conversion Factors
72
Supplementary Table 6 (4) SI Units and Conversion Factors
Supplementary Table 6 SI Units and Conversion Factors
73
Miniature and Extra -small Ball Bearings
Supplementary Table 7 Inch / Millimeter Conversion
74
Supplementary Table 8 Steel Hardness Conversion
Supplementary Table 8 Steel Hardness Conversion
75
Miniature and Extra -small Ball Bearings
Supplementary Table 9 Viscosity Conversion
76
Research and Development
KOYO SEIKO promotes research and developmentactivities through an excellent research environment fea-turing advanced research facilities. We are steadily making improvements in the perfor-mance of miniature and extra-small ball bearings, suchas low torque, high running accuracy, and longer life. We are also actively developing new products.
● Technical Center (Osaka,Japan)
Research and Development
● Vibration tester ● Surface roughness / form tester
● Clean room ● Thermo-hydrostatic test chamber
77
Miniature and Extra -small Ball Bearings
With more than 75 years experience, KOYO SEIKOproduces bearings using state-of-the-art manufactur-ing facilities.
Plants
● MS Project Division (Kagawa,Japan)
● KOYO NIDEC (DALIAN) PRECISION BEARINGS CO., LTD. (Dalian, China)
* I S O 9002 certified.
● WUXI KOYO BEARING CO., LTD. (Wuxi, China)
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INTERNATIONAL NETWORK
*
*
( )KOYO SEIKO CO., LTD. (Japan) is certified to ISO9001. ISO9002 certified. *
CAT.NO.295EPrinted in Japan ,97.9-3CM(,97.9)
MINIATURE AND EXTRA-SMALL BALL BEARINGS