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BALL & ROLLER BEARINGS

ISO 9001/QS-9000Certificate No. 927265

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Copyright KOYO 1997

The contents of this catalogue are the copyright of KOYO and

may not be reproduced unless permission is granted.

Cares have been taken in every aspect to ensure the correctness

of the data contained in this catalogue but no liability can be

accepted for any mistakes or omissions.

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¡Technical section

1. Structures and types 2. Internal clearance 3. Bearing numbers 4. Handling of bearings

¡Bearing specification tables

Deep groove ball bearings d 3– 200 mm

Angular contact ball bearings d 10– 200 mm

Self-aligning ball bearings d 10– 100 mm

Cylindrical roller bearings

d 20– 200 mm

Tapered roller bearings

d 15– 200 mm

Spherical roller bearings

d 25– 300 mm

Thrust ball bearings

d 10– 200 mm

Spherical thrust roller bearings d 60– 300 mm

Ball bearing units

d 10– 140 mm

Locknuts and lockwashers

¡Supplementary tables¡Products information

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BALL & ROLLER

BEARINGSPOPULAR SIZE

CAT.NO.203E-1

¡VALUE & TECHNOLOGY

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¡

Standard ball and roller bearings

¡

Ball bearing units

¡

Locknuts¡

Lockwashers

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Introduction

This catalogue is prepared to show most popular ball and roller

bearings used in various applications.These bearings are generally

available from stock.

As the technical information mentioned in this catalogue is limited,

when more detailed information is required for new design of applica-tion, it is recommended that the KOYO General Catalogue is referred.For trouble free operation of the application, it is recommended to

keep the bearings in proper condition avoiding from extreme high or

low temperature, wet, contamination, hitting, dropping, etc..

Also proper handling and maintenance are required at mounting,

regular inspection, overhaul, and dismounting by the use of suitable

tools, jigs and lubricant.

*For improvements, as well as other reasons, the contents of this

catalogue are subject to change without prior notice.

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Contents

1.Rolling bearing structures and types........................................A1

2.Bearing internal clearance ..........................................................A11

3.Bearing numbers .........................................................................A21

4.Handling of bearings ...................................................................A22

Deep groove ball bearings

Angular contact ball bearings

Self-aligning ball bearings

Cylindrical roller bearings

Taperedroller bearings

Spherical roller bearings

Thrust ball bearings

Spherical thrust roller bearings

Ball bearing unitsd 3 – 200 mm .......................B2d 10 – 200 mm ......................B16d 10 – 100 mm ......................B34d 20 – 200 mm ......................B42d 15 – 200 mm ......................B50d 25 – 300 mm ......................B70d 10 – 200 mm ......................B88d 60 – 300 mm ......................B94d 10 – 140 mm ......................B98Locknuts and lockwashers ..............................................................B 132.................................................C 1

.................................................D 1

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Bearings are classified as follows, by the

number of rows of rolling elements:single-

row, double-row, or multi-row (triple- or four-

row) bearings.

Outer ring

Ball

Inner ring

Cage

CageCupRollerConeDw, Dw >5 mm)1)Dw, Dw≤5 mm)1)Note 1) Lw:roller length Dw:roller diameter(mm)(mm)3) CageThe cage guides the rolling elementsalong the bearing rings, retaining the rollingelements in correct relative position.There are various types of cages includingpressed, machined, molded, and pin typecages.Due to lower friction resistance than that

found in full complement roller and ball bear-

ings, bearings with a cage are more suitable

for use under high speed rotation.

Deep groove ball bearingTapered roller bearing1-2 Type

The contact angle (α) is the angle formed

by the direction of the load applied to the

bearing rings and rolling elements, and a

plan perpendicular to the shaft center, when

the bearing is loaded.

Shaft washerBallHousing washerCage

Thrust ball bearing

Note) In thrust bearings inner and outer rings and also called

"shaft washer" and "housing washer" respectively; in

tapered roller bearings, the respective forms are "cone"

and "cup."

Fig. 1-1 Bearing structureBearings are classified into two types in

accordance with the contact angle (α).

Radial bearings (0 ≤α ≤45 )

...designed to accommodate

mainly radial load.

Thrust bearings (45 < α ≤90 )

...designed to accommodate

mainly axial load.

Rolling bearings are classified in Fig.1-2,

and characteristics of each bearing type are

described in Tables 1-1 to 1-8.1) Bearing ringsThe path of the rolling elements is calledthe raceway;and, the section of the bearingrings where the elements roll is called theraceway surface.In the case of ball bearings,since grooves are provided for the balls, theyare also referred to as raceway grooves.The inner ring is normally engaged with ashaft;and, the outer ring with a housing.

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Deep groove ball bearing

Angular contact

ball bearing

Four-point

contact

ball bearing

Self-aligning

ball bearing

Cylindrical

roller bearing

Needle

roller bearing

Tapered

roller bearing

Spherical

roller bearingThrustball bearingdirection

Angular contact

thrust

ball bearing direction seat washer seat washers

directiondirection

Cylindrical roller thrust bearing

Needle roller

thrust bearing

Tapered roller

thrust bearing

Spherical thrust

roller bearing

Fig. 1-2 Rolling bearingsSingledirectionDoubledirection

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Table 1-1 Deep groove ball bearings

widely used in a variety of industries.

sRadial load and axial load in both directions can be

accommodated.

sSuitable for operation at high speed, with low noise

and low vibration.

sSealed bearings employing steel shields or rubber

seals are filled with the appropriate volume of grease

when manufactured.s

son the outer ring are easily mounted in housings forsimple positioning of housing location.sIn spite of having the same boundary dimensions asstandard bearings, maximum type bearings have ahigher load rating because a filling slot on each ofthe inner and outer rings, allows a greater number ofballs to be inserted than do standard bearings.

[Recommended cages ] Pressed steel cage (ribbon types, snap type ...single-row, S type ...double-row),

copper alloy or phenolic resin machined cage, synthetic resin molded cage

[ Main applications ] Automobile :front and rear wheels, transmissions, electric devices

Electric equipment :standard motors, electric appliances for domestic use

Others :measuring instruments, internal combustion engines, construction

equipment, railway rolling stock, cargo transport equipment, agricultural

equipment, equipment for other industrial uses

BearingchamferracewayInner ringracewaychamferFaceFace(ribbon type)

Unit mm

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Table 1-2 Angular contact ball bearings

[ Main applications ] Single-row :machine tool spindles, high frequency motors, gas turbines, centrifugal

separators, front wheels of small size automobiles, differential pinion shafts

Double-row :hydraulic pumps, roots blowers, air-compressors, transmissions, fuel injec-

tion pumps, printing equipment

Outer ring back facefront faceContact angles ofKoyo bearings (Reference) Ball and bearing ring are not separable.

δ1) "G type" bearings are processed (with flush ground) such that the stand-out turns out to be δ1= δ2. The matched pair DB, DF, and DT, or stack are available.

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Table 1-3 Self-aligning ball bearings

s

ment, accommodating shaft or housing deflection

and misaligned mounting conditions.

sTapered bore design can be mounted readily

using an adapter.

[ Recommended cages ]

Pressed steel cage staggered type ....12, 13, 22...2RS, 23...2RS

snap type ............22, 23

[ Main applications ]

Power transmission shaft of wood working and

spinning machines, plummer blocks

Bearing width

Pressed cage LockwasherLocknut

Adapter sleeve Adapter assembly

1B)(d1 = d

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Table 1-4 Cylindrical roller bearings

Since the design allowing linear contact of cylindrical

rollers with the raceway provides strong resistance

to radial load, this type is suitable for use under

heavy radial load and impact load, as well as at

high speed.

sN and NU types are ideal for use on the free side :

they are movable in the shaft direction in response to

changes in bearing position relative to the shaft or

housing, which are caused by heat expansion of the

shaft or improper mounting.ssNJ and NF types can accommodate axial load in onedirection ;and NH and NUP types can accommo-date partial axial load in both directions.sWith separable inner and outer ring, this typeensures easy mounting.sDue to their high rigidity, NNU and NN types arewidely used in machine tool spindles.

[ Recommended cages ] Pressed steel cage (Z type), copper alloy machined cage, pin type cage,

synthetic resin molded cage

[ Main applications ] Large and medium size motors, traction motors, generators, internal combustion

engines, gas turbines, machine tool spindles, speed reducers, cargo transport equip-

ment, and other industrial equipment

Lubrication Center ribRibRibcage

Pin type cage (suitable for large size bearings)

Removal groove

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Table 1-5 Tapered roller bearings

sed by the cone back face rib.

sThe raceway surfaces of cone and cup and the

rolling contact surface of rollers are designed so that

the respective apexes converge at a point on the

bearing center line.

sSingle-row bearings can accommodate radial load

and axial load in one direction, and double-row bear-

ings can accommodate radial load and axial load in

both directions.

sThis type of bearing is suitable for use under heavy

load or impact load.and steep types, in accordance with their coctactangle (α).The larger the contact angle is, the greater the bear-ing resistance to axial load.sSince cup and cone assembly can be separatedfrom each other, mounting is easy.sBearings designated by the suffix " J " and " JR " areinterchangeable internationally.sItems sized in inches are still widely used.s

[ Recommended cages ] Pressed steel cage, synthetic resin molded cage, pin type cage

[ Main applications ]Automobile :front and rear wheels, transmissions, differential pinion

Others :machine tool spindles, construction equipment, large size agricultural

equipment, railway rolling stock speed reduction gears, rolling mill roll

necks and speed reducers, etc

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Table 1-6 Spherical roller bearings

convex rollers, double-row inner ring and outer ring

are classified into three types :R (RR), RH (RHR)

and RHA, according to their internal structure.

sWith the bearing designed such that the circular

arc center of the outer ring raceway matches with

the bearing center, the bearing is self-aligning,

insensitive to errors of alignment of the shaft rela-

tive to the housing, and to shaft bending.

sThis type can accommodate radial load and axial

load in both directions, which makes it especially

suitable for applications in which heavy load or

impact load is applied.s

dismounted by using an adapter or withdrawalsleeve.There are two types of tapered bores(tapered ratio) : 1 :30 supplementary ...Suitable for code K30 series 240 and 241. 1 :12 supplementary ...Suitable for series code K other than 240 and 241.sLubrication holes, a lubrication groove and anti-rotation pin hole can be provided on the outerring.Lubrication holes and a lubrication groovecan be provided on the inner ring, too.s

[ Recommended cages ] Copper alloy machined cage, pressed steel cage, pin type cage,

synthetic resin molded cage

[ Main applications ] Paper manufacturing equipment, speed reducers, railway rolling stock axle journals,

rolling mill pinion stands, table rollers, crushers, shaker screens, printing equipment,

wood working equipment, speed reducers for various industrial uses, plummer blocks

sleeve(Bore diameter ≤180 mm)(Bore diameter ≥200 mm)(For shaker screen)

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Table 1-7 Thrust ball bearings

ssThis type of bearing comprises washer-shaped

rings with raceway groove and ball and cage

assembly.

sWashers to be mounted on shafts are called shaft

washers (or inner rings);and, washers to be

mounted into housings are housing washers (or

outer rings).

Central washers of double direction bearings are

mounted on the shafts.Single direction bearings accommodate axial loadin one direction, and double direction bearingsaccommodate axial load in both directions.(Both of these bearings cannot accommodateradial loads.)sSince bearings with a spherical back face areself-aligning, it helps to compensate for mountingerrors.[ Recommended cages ] Pressed steel cage, copper alloy or phenolic resin machined cage,synthetic resin molded cage

[ Main applications ] Automobile king pins, machine tool spindles

cage

(øD )

Pressedcage

chamferAligning seat washerCentral washerAligning seat washer

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Table 1-8 Spherical thrust roller bearings

29200

29300

29400

This type of bearing, comprising barrel-shaped

convex rollers arranged at an angle with the axis,

is self-aligning due to spherical housing washer

raceway;therefore, shaft inclination can be com-

pensated for to a certain degree.

sGreat axial load resistance is provided.

This type can accommodate a small amount of

radial load as well as heavy axial load.

sNormally, oil lubrication is employed.s

[ Recommended cage ]

Copper alloy machined cage

[ Main applications ]

Hydroelectric generators, vertical motors, propeller

shafts for ships, screw down speed reducers,

jib cranes, coal mills, pushing machines,

molding machines

Shaft

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2. Bearing internal clearance

Table 2-1 Radial internal clearance of deep groove ball bearings (cylindrical bore)

Unit µm

Remarks) 1.For measured clearance, the increase of radial internal clearance caused by the measurement load should be

added to the values in the above table for correction.Amounts for correction are as shown below.

Of the amounts for clearance correction in the C2 column, the smaller is applied to the minimum clearance, the

larger to the maximum clearance.

2.Values typed in Italics are based on the Koyo standards.

Remark) For measured clearance, the following amounts should be added for correction.

Extra-small ball bearing:9 mm or larger in outside diameter and under 10 mm in bore diameter Miniature ball bearing:Under 9 mm in outside diameter

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Table 2-3 Axial internal clearance of matched pair angular contact ball bearings

(measurement clearance) 1)

Unit µm