SKF ConCentra roller bearing units for fast and … SKF ConCentra roller bearing units? ..... 4 The SKF Explorer spherical roller bearing..... 5 The SKF stepped sleeve..... 6 The SKF

SKF ConCentra roller bearing units for fast and reliable mounting

Now also including tablesfor inch assortment

Contents

1 Product information.................................................. 3

Ready to mount and operate....................................... 3Why SKF ConCentra roller bearing units? ................. 4The SKF Explorer spherical roller bearing .................... 5The SKF stepped sleeve............................................... 6The SKF plummer block housing ................................. 6The seals....................................................................... 7The lubricant ................................................................. 7

A wealth of variants...................................................... 8For total economy......................................................... 10

2 Recommendations.................................................... 12

Selection of bearing size ............................................. 12Design of bearing arrangements ................................ 14Arrangement of bearing units ....................................... 14Location on the shaft .................................................... 14Attachment to the support surface............................... 15The housing surface ..................................................... 17Sealing .......................................................................... 17

Lubrication .................................................................... 18Trouble-Free Operation................................................ 20Mounting and dismounting.......................................... 21Tools ............................................................................. 21Mounting....................................................................... 22Dismounting.................................................................. 24

3 Product data.............................................................. 26

General product data ................................................... 26Product tables............................................................... 28ConCentra roller bearing units for metric shafts .......... 28ConCentra roller bearing units for inch shafts .............. 32

Other SKF bearing units............................................... 40

SKF – The knowledge engineering company............. 42

2

The SKF brand now stands for more than ever before, and means more to you as a valued customer.

While SKF maintains its leadership as the hallmark of quality bearings throughout the world, new dimensions in technical advances, product support and services have evolved SKF into a truly solutions-oriented supplier,creating greater value for customers.

These solutions encompass ways to bring greater productivity to customers, not only with breakthrough application-specific products, but also through leading-edge design simulation tools and consultancy services,plant asset efficiency maintenance programs, and theindustry’s most advanced supply management techniques.

The SKF brand still stands for the very best in rolling bearings, but it now stands for much more.

SKF – The knowledge engineering company

Ready to mount and operate

• They must be easy to install on theshaft and sit firmly in position. Theymust be protected against contam-ination during mounting.

• Conditioning monitoring should bepossible to avoid unplanned stop-pages and prevent premature bear-ing replacement, just to be on thesafe side.

SKF ConCentra roller bearing units aresuch mounted roller bearings whichsatisfy all these demands.

• They should be ready to mount, i.e.the bearings should have the correctclearance and be greased andsealed.

• They should reduce operating costs.The fewer components to be bought,the fewer parts that have to storedand documented.

• They should permit the use of com-mercial shafting, to save costs andmachining needs.

• They must tolerate errors of align-ment and shaft deflections.

3

Tough jobs need tough machines andequipment which keep functioningeven under difficult conditions. To dothis specific bearing arrangements areneeded, particularly housed bearingssuch as those used on conveyors,often outdoors.

Mounted roller bearings are mostsuitable for this type of applicationand often provide a cost favourablealternative to conventional bearingand housing arrangements.

The demands placed by the designerand purchaser on such products in-clude the following.

1

1 Product information 2 Recommendations 3 Product data

The demands Page .............. 12 Page .............. 26

Why SKF ConCentra rollerbearing units?

• long service life,• high operational reliability,• quick mounting

and require

• little maintenance.

Simple replacement is also a valuableconsideration, and the units are avail-able wherever they may be requiredsupported by the worldwide SKF salesorganisation.

The total cost of SKF ConCentra rollerbearing units is a convincing benefit asare the design characteristics.

4

Quite simply because they are basedon the well-proven and very successfulSKF Explorer spherical roller bearingswhich are state-of-the-art products.Because the housings are also SKFproducts and SKF has determined thestate of the art of bearing housings formore than 80 years.

Thus SKF know-how and wideexperience of mounted bearings havebeen built into SKF ConCentra rollerbearing units, as have quality andtrouble-free operation. SKF ConCentraroller bearing units of series SYT alsooffer


Customer benefits Page .............. 12 Page .............. 26

Stepped sleeve

Grease nipple

SKF Explorer spherical roller bearing

Locating or non-locating bearingarrangement

Plummer block housing

Seal

1,5°

5

The SKF Explorerspherical roller bearingSKF Explorer spherical roller bearingsare at the heart of ConCentra rollerbearing units. More significantly, theyare spherical roller bearings in the 222series, the most popular seriesworldwide. This means that they haveproven their performance millions oftimes, are state-of-the-art products andhave the following characteristics:

• self-alignment capability• many long and large-diameter

rollers• symmetrical rollers with special

profile• self-guiding rollers• floating guide ring between the

roller rows• steel window type cages

The benefits of these characteristicsare long life, high operational reliabilityand compact design. These benefitsprovide opportunities for long servicelives or for downsizing.

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Design characteristics Page .............. 12 Page .............. 26

Tolerate errors of alignmentThe bearings are able to align themselvesand are thus insensitive to misalignments of the shaft relative to the housing.

Very high load carrying capacityThe symmetrical rollers automatically positionthemselves providing an even distribution ofload over the roller length and providing veryhigh reliability under all load conditions.

No edge stressesThe special roller profile obviates the dangerof edge stresses occurring.

Low friction and minimum heatgenerationThe self-guidance of the rollers and thefloating guide ring which guides the rollersaxially through the unloaded zone keep frictionand heat generation at a minimum.

Lightweight and high strengthThe steel window-type cages are lightweightbut highly stable and wear-resistant. Theyoccupy little space in the bearing leavingroom for adequate lubricant supply.

SKF Explorer qualityAll the bearings belong to the newperformance class, referred to as SKFExplorer. SKF Explorer class spherical rollerbearings live longer under heavier loads andmuch longer under the same loads.

The SKF stepped sleeveThe particular adapter sleeve designfor the SYT units is a masterly piece oflocation technology. It is highly efficientand has a low cross section. The out-side surface of the sleeve and thebearing bore both have a saw-toothedprofile. When these profiles are axiallydisplaced against each other a veryreliable location of the bearing on theshaft will be achieved. The operation isexceedingly simple.

The benefit for the user is very quickassembly. It is simply a matter of push-ing the unit along the shaft and thenbolting it to the support.

The SKF plummer block housingRobust non-split plummer (pillow)block housings of grey cast ironenclose the bearings and efficientlyprotect them from external mechanicaldamage. The stiff design helps thehousings to retain their form. Theholes for the attachment bolts arecast. All housings are provided with a grease nipple, allowing lubricant tobe supplied direct to the bearing.

The housings of the SYT units arebased on the SNL plummer blockhousings of Dimension Series 5 –another state-of-the-art SKF product –and have the same high stiffness andgood heat conducting properties.They can also be quickly adapted toindividual applications.

If required it is also possible tosupply housings made of spheroidalgraphite cast iron. The units are thenidentified by a D in the designationprefix: SYTD.

6



The saw-toothed profileThe requirements were clear and simple – a sleeve was required having a relativelysteep angle of taper but at the same time a low cross section. The SKF answer isequally clear and simple – the sleeve andbearing bore both have a profile whichconsists of several equal tapered sectionsarranged one after another.

The reliable fixationTo obtain this a mounting ring with grub (set)screws has been added to the adaptersleeve. By tightening the screws the innerring is pushed axially along the sleeve andlocked in position.

Stiff designThe base of the SYT housings is reinforced.This reinforcement also surrounds the holesfor attachment bolts providing a reliable holdon the support surface. The preload forces of the bolts provide good contact with thesupport to make sure that the housing baseand thus the housing as a whole cannotdeform.

Markings for additional holesThe most suitable positions for additionalholes are clearly indicated on the casting. For example, if the housings are to beinstalled on T beams, four additional holes for attachment bolts can be drilled at theindicated positions. The most appropriateposition for the attachment of permanentcondition monitoring sensors is alsoindicated.

The sealsThe integral seals contribute to thecompactness of the ConCentra rollerbearing units. The factory grease fillprovides a suitable amount of thecorrect lubricant from the outset.These features make the ConCentraroller bearing units ready to mount andoperate at a modest cost.

There is a choice of two seal designsand both accommodate misalignmentand axial movements. End covers arealso available for SYT housings mount-ed on shaft ends.

The lubricantIn order for ConCentra roller bearingunits to perform correctly they are filledwith SKF LGEP 2 grease. This is a light-brown, high-quality lithium thickenergrease with EP additives and a mineralbase oil and is characterised by

• good lubricating properties underheavy loads and at low speeds,

• minimal lubricant loss under severeoperating conditions,

• excellent ageing resistance,• excellent water resistance, and• very good rust inhibiting properties.

Well lubricatedThe SKF LGEP 2 grease is well suitedfor ConCentra roller bearing unitapplications; it fills between 30 and 50 % of the free space in the housing.

7

1



Double-lip sealsThese seals allow excess grease to exit butexclude solid contaminants and moisture;the operating temperature range is –50 to+100 °C.

Labyrinth sealsThese allow high-speed operation and thelimit to the operating temperature is set bythe grease rather than the seal.

End coversTo protect shaft ends and preventaccidents. The operating temperaturerange is –20 to +100 °C.

8


Product range Page .............. 12 Page .............. 26

A wealth of variants

The standard range of SKF ConCentraroller bearing units comprises SYTplummer block units for 35 to 75 mmdiameter metric shafts, thus coveringmost market needs. To meet individualrequirements, they are available as

• non-locating bearing units as well as• locating bearing units.

These units are shown in the producttable on pages 28 and 29.

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1


Product range Page .............. 12 Page .............. 26

Additional series for inch shaftsThe standard range of ConCentraroller bearing units for metric shafts iscomplemented by several series andsizes of plummer block bearing unitsfor inch-size shafts of diameter 1 7/16

to 4 in, inclusive. These differ slightlyin their dimensions and designs. Therange includes units in the

• SYR .. N series, • SYE .. N series and • FSYE .. N series.

based on the SYR, SYE and FSYEplummer block units which have beensuccessful on the American market for many years. The most importanttechnical data for these units for inch-size shafts will be found on pages 32to 39.

Locating or non-locatingarrangementsGenerally two bearings are required tosupport a rotating machine component:a locating bearing and a non-locatingbearing. Consequently the SKFConCentra roller bearing units areavailable in two versions – a locatingdesign and a non-locating design.

A choice of sealsDifficult environments with a lot ofdust, dirt and dampness call for strongseals. For such environments thedouble-lip seals are the answer. Foroperation at higher speeds and whenthe environment is not so severe, thelabyrinth seals are more appropriate.Both seals are standard equipment.

Another choiceThe standard housings are made ofgrey cast iron. If even greater strengthis needed, housings of spheroidalgraphite cast iron can be supplied.

The ConCentra roller bearing unit designs

Locating bearing arrangement Non-locating bearing arrangement

Double-lip seal Labyrinth seal

SYT SYR .. N SYE .. N FSYE .. N

Solution

10


Applications Page .............. 12 Page .............. 26

For total economy

The high load carrying capacity andhigh reliability, the robust design andeasy maintenance, and above all, thesimple and rapid mounting mean thatSKF ConCentra roller bearing units areappropriate for a wealth of applications.For example, consider the operatingconditions bearing arrangements haveto withstand in quarrying equipment.

They are usually exposed to theweather as well as dust and dirt, haveto carry heavy loads and survive im-pacts and in spite of this should lastfor a long while. Or units in a sawmill.Dust and sawdust are everywhere,getting into everything, and may evenbe mixed with water.

If the bearings should fail, they canvery easily be replaced on site – by theready-to-mount, ready-to-operate pre-greased and sealed units with pre-setclearance which cannot becomecontaminated during mounting – theSKF ConCentra roller bearing units.

Applications

• Mining and metallurgicalequipment

• Refining equipment• Belt, bucket and chain conveyors• Large washing installations• Agricultural and forestry

machinery• Food and beverage processing

equipment• Fans and blowers• Mixers, crushers and screens• Light rail vehicles• Wastewater treatment equipment• Commercial laundry equipment

Requirements

• Ready to mount and operate• Robust design• Strong and reliable• Efficiently sealed• Grease pre-lubricated • Can be relubricated• Simple location on shaft• Insensitive to misalignment• Condition monitoring possible

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1


Applications Page .............. 12 Page .............. 26

The life-extending improvementsembodied in SKF Explorer sphericalroller bearings can best be understoodusing the equation for SKF rating lifewhich is in accordance with ISO281:1990/Amd 2:2000. This calculationmethod constitutes an extension of thefatigue life theory and is better able topredict bearing life. For roller bearings

Lnm = a1 aSKF L10

or

C 10/3Lnm = a1 aSKF ( )P

If the speed is constant, it is often pre-ferable to calculate the life expressedin operating hours using

1 000 000 C 10/3Lnmh = a1 aSKF ( )60 n P

whereLnm = SKF rating life (at 100 – n %

reliability), millions of revolutionsLnmh = SKF rating life (at 100 – n %

reliability), operating hoursL10 = basic rating life (at 90 % reli-

ability), millions of revolutionsa1 = life adjustment factor for

reliability (➔ table )aSKF = SKF life modification factor

(➔ diagram )C = basic dynamic load rating, kNP = equivalent dynamic bearing

load, kNn = rotational speed, r/min

1

1

12


Page ................. 3 Requisite size Page .............. 26

Selection of bearing size

Reliability Factor % a1

90 195 0,6296 0,5397 0,4498 0,3399 0,21

aSKF factorThe aSKF factor represents a very complex relationship between variousinfluencing factors including contam-ination and lubrication. Lubricationconditions are expressed by the vis-cosity ratio κ. Values of aSKF can beobtained from diagram for differentvalues of ηc (Pu/P) and κ. This couldalso be calculated by using the “SKFInteractive Engineering Calalogue” onCD-ROM or online at www.skf.com.

Diagram has been drawn up for a safety factor commonly used in fatiguelife considerations.

1

1

Equivalent dynamic bearing loadThe equivalent dynamic bearing load for spherical roller bearings can be obtained from

P = Fr + Y1Fa when Fa/Fr ≤ eP = 0,67 Fr + Y2Fa when Fa/Fr > e

whereP = equivalent dynamic bearing

load, kNFr = actual radial bearing load, kNFa = actual axial bearing load, kNY1, Y2 = axial load factors for the

bearingse = calculation factor

Appropriate values of the factors e, Y1and Y2 will be found in the producttables for each individual bearing.

Life adjustment factor a1

1Table

13

2


Page ................ 3 Requisite size Page .............. 26

0,005 0,01 0,02 0,050,05

0,1

0,1

0,2

0,2

0,5

0,5

1

1

2

2

5

10

20

50

5

aSKF

ηcP

PuPuP

––

κ=

44222

0,8

00,8

0

0,5

0,150,1,

0,2

0,6

0,40,0,

0,3

1

If κ > 4 , use κ = 4 curve

Factor aSKF for SKF Explorer spherical roller bearings

1DiagramExample For a ConCentra roller bearing applica-tion following example could be applic-able during normal circumstances:The operating conditions for ConCentraroller bearing unit SYT 40 L, includingSKF Explorer class bearing 22208 E, are:

• equivalent dynamic bearing loadP = 12 kN

• vicosity ratio κ = 3• contamination factor ηc = 0,5• basic load rating C = 96,5 kN• fatigue load limit Pu = 9,8 kN• life adjustment factor a1 = 1• rotational speed n = 1 000 r/min

Thus

ηc (Pu/P) = 0,5 (9,8/12) = 0,41

Using diagram and κ = 3 givesaSKF ≈ 6.

Using formula

1 000 000 C 10/3Lnmh = a1 aSKF ( )60 n P

then gives

L10mh = 1 × 6 × 1 000 000 × (96,5)10/3

60 × 1 000 12

≈ 104 000 h

Further information on selection ofbearing size can be found in the SKFGeneral Catalogue or the “SKF Inter-active Engineering Catalogue” on CD-ROM or online at www.skf.com.

1

SKF Explorerbearings

14


Page ................ 3 Attachment to shaft Page .............. 26

Other components on the shaftIn order to allow the units to be dis-mounted easily, a space of at least 40 mm should be left between the unitand adjacent components on the shaft(➔ fig ). This is necessary to provideaccess to the grub screws in the ringat the “DISMOUNT.SIDE”. The mount-ing and dismounting sides are markedon the housing (➔ fig ).

Bearing arrangements at shaft endsTo protect bearing arrangements onthe ends and to avoid accidents, endcovers are available for ConCentraroller bearing units of series SYT.These plastic covers are suitable foroperating temperatures from –20 to+100 °C and are snapped intorecesses in the housing bore.

The appropriate cover for a particularunit will be found in table which alsoprovides the value of the cover protru-sion.

1

3

2

Design of bearing arrangements

1Fig

Arrangement of bearing unitsTo support a rotating component, e.g.a shaft, two ConCentra roller bearingunits are required: a locating bearingunit and a non-locating bearing (➔ fig ).

The locating bearing unit at one endof the shaft supports it radially andlocates it axially in both directions. Thenon-locating bearing unit at the otherend also provides radial support andmust allow axial displacements result-ing from thermal changes in shaftlength to take place. These are accom-modated between the bearing outerring and the housing bore.

The locating bearing unit should bearranged at the drive side (➔ fig ).1

1

Location on the shaftShaft requirementsThe special method of securing theConCentra roller bearing units to theshaft allows the use of commercialshafting.

TolerancesIn normal cases shafts machined totolerance h9 can be used. The cylin-dricity as defined in ISO 1101:1996should be according to IT5/2. For lessdemanding applications h10 and IT7/2may be satisfactory.

Surface finishThe surface roughness Ra to ISO 4288:1996 for the sleeve seating should notexceed 3,2 µm.

Arrangement of bearing units

Unit End coverBasic Dimensions Designationdesignation ba A1

max min

– mm –

SYT 35 43 34 50 ECY 207SYT 40 43 34 51 ECY 208SYT 45 43 34 52 ECY 209



15

2


Page ................ 3 Attachment to support Page .............. 26

40 mm

2Fig

1Table

Ab1

a

End covers for shaft end bearing arrangements

Minimum distance to adjacent components

SYT 60 LMOUNT.SIDE DISMOUNT.SIDE

Dismounting Instructions1: Side with only two screws is Dismounting side.

2. Using 3 mm hex key, adjust screws as follows.

3. First snug up, then loosen Mounting side screws.

Alterately tighten Dismounting side screws in 1/4turn increments until shaft rotates freely in bearing,or POP is heard.

4.

Relubricate with SKF grease LGEP2 or equivalent

SKF ConCentraPatented product

3Fig

Bearing unit marking

Attachment to thesupport surfaceConCentra roller bearing units haveholes in the feet to take attachmentbolts. The holes allow subsequentadjustment of housing position.

Support surfaceTo provide operational reliability and a long service life for the units, it is rec-ommended that the support surfaceshould have a surface roughness Ra ≤ 12,5 µm. The flatness tolerance(planicity) should lie within IT7.

Holes for attachment boltsThe ConCentra roller bearing units ofseries SYT have two cast holes in thefeet as standard. It is possible to drillfour additional holes in the series SYTunits if required by the application.The positions where these holesshould be drilled are indicated on thecasting. Details of the positions andsuitable dimensions for these holeswill be found in table on page 16.

Attachment boltsHexagonal headed bolts to ISO 4014:1988 are recommended. Where loadsact vertically towards the support sur-face, bolts of strength 8.8 are adequate.If the loads act at other angles strongerbolts to class 10.9 may be necessary.The recommended tightening torquesfor class 8.8 bolts are given in table on page 16.

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2

16


Page ................ 3 Attachment to support Page .............. 26

Unit DimensionsBasic J6 J7 N4designation max

– mm

SYT 35 135 23 6SYT 40 135 23 6SYT 45 135 23 6

SYT 50 170 27 8SYT 55 172 27 8SYT 60 190 32 8

SYT 65 190 32 8SYT 70 218 35 8SYT 75 218 35 8

4Table

N

J7

4J6

Position and size of dowel pin holes

Bolt Recommendedsize tightening torque

– Nm

M 12 80M 16 200M 20 385M 24 656

1/2 UNC 955/8 UNC 1853/4 UNC 3207/8 UNC 5151 UNC 770

3Table

Tightening torques for attachment boltsof strength class 8.8

Unit Dimensions AppropriateBasic J1 J2 N2 bolt sizedesignation

– mm –

SYT 35 160 34 11 M 10SYT 40 160 34 11 M 10SYT 45 160 34 11 M 10

SYT 50 200 40 14 M 12SYT 55 200 40 14 M 12SYT 60 220 48 14 M 12

SYT 65 220 48 14 M 12SYT 70 252 52 18 M 16SYT 75 252 52 18 M 16

2Table

N

J2

2

J1

Position and size of four bolt holes

17

2


Page ................ 3 Seals Page .............. 26

5Fig4Fig

PinsWhere the load acts vertically towardsthe support surface, the ConCentra rollerbearing units are adequately secured inposition by the attachment bolts. If

• the direction of the load lies between55° and 120° or if

• the load acts in parallel to the sup-port surface and exceeds 5 % ofthe breaking load P180°, the unitsshould be located against a stop orshould be pinned to the supportsurface. Information on the lines ofaction of the loads as well as thebreaking loads is given in tableon page 27.

The position for holes to take suchpins is indicated on the housing foot.Details of the position and size ofthese holes are given in table .

The housing surfaceThe housings of ConCentra rollerbearing units are painted blue. Thelayer of paint offers protection againstrust as specified by category C2, ISO12944-2:1998. This is adequate for themajority of applications.

The units can be repainted by the userif it is desired to have a uniform colourfor the machine or plant. When repaint-ing it should be remembered that

• the housing bore with its bearingshould be covered at both sides,e.g. with discs cut from cardboardor plastic,

• the grease nipple should bereplaced by a plug which protectsthe thread,

• the colour is resistant to normallyused low-alkalinity washing chem-icals; to avoid fretting effects on thesurface when washing colouredcastings, it is, however, alwaysimportant to follow the instructionsfrom the supplier of the washingchemicals, regarding concentration,temperature and time.

The label carrying the unit designation (➔ fig , page 15) is covered with a thin transparent foil, which can bepeeled off after repainting, leaving thedesignation clearly visible.

3

4

1

SealingConCentra roller bearing units areused in a large variety of applicationsso that demands can vary widely. Tomake the units suitable under extremelydirty conditions as well as under normalconditions but where circumferentialspeeds are high, these SKF units areavailable with a choice of contactingand non-contacting seals:

• double-lip seals (➔ fig ), nodesignation suffix, or

• labyrinth seals (➔ fig ),designation suffix TL.

The properties of these seals aredescribed briefly in the following.

When selecting the seal the mostimportant points to consider are

• the environmental conditions,• the circumferential speed and• the operating temperature.

If the operating temperature is particu-larly low or high, a check should bemade that the operating temperaturerange of the standard grease is suitable.

Double-lip sealsThe double-lip seal (➔ fig ) is a con-tacting seal. It consists of a double-lipnitrile rubber (NBR) seal vulcanised onto a pressed steel shell.

The steel shell sits firmly in the hous-ing bore and provides static sealing.The externally directed dust lip forms anarrow gap with the cylindrical surfaceof the mounting rings and protects the

4

5

4

internal seal lips against abrasivematerial from the environment. Therubber lips prevent the entrance of dustand moisture and retain the grease;they do, however, allow excess greaseto exit during relubrication.

The nitrile rubber has very good en-gineering properties which make it themost popular material for contactingseals. It has good resistance to manymineral oils and greases with a mineraloil base. It is also resistant to hot water.The operating temperature range liesbetween –50 and +100 °C, but briefperiods of operation at temperatures upto +120 °C are possible.

The operational speed limits for thedouble-lip seal can be found in theproduct table on page 29.

Labyrinth sealsThe labyrinth seal (➔ fig ) consistsof three sheet steel rings. Two of theseare mounted on the mounting rings,arranged at both sides of the bearing;they rotate with the shaft and act asflingers. The third ring is secured in thehousing bore. A narrow sealing gap isformed between this ring and theother two rings.

When starting up or after relubrica-tion of the ConCentra roller bearingunits, excess grease may exit throughthe seal.

The labyrinth seals can be operatedat the speeds quoted for the grease-lubricated spherical roller bearings (➔product table on page 29). There are nooperating temperature limits except thatimposed by the grease used in the unit.

5

Double-lip seal Labyrinth seal

18

Lubrication


Page ................ 3 Lubrication Page .............. 26

3Fig 4Fig

2Fig1FigConCentra roller bearing units are lubri-cated with SKF LGEP 2 grease beforeleaving the factory. The quantity ofgrease fills some 30 to 50 % of the freespace in the housing. The LGEP 2 greaseis a high-quality lithium thickener greasewith a mineral base oil and it contains EPadditives. The grease is characterised by:

• little wear under difficult operatingconditions;

• good lubricating conditions underheavy loads and at low speeds;

• excellent ageing resistance;• excellent water resistance;• very good rust inhibiting properties.

It also fulfils demands for very smoothrunning.

ConCentra roller bearing units areequipped with a grease nipple AH 1/8-27 PTF as standard. This opens overthe annular groove with its three lubri-cation holes in the outer ring of thebearing so that the bearing can berelubricated. The threaded hole for thenipple has a 1/8-27 NPSF threadwhich also permits the use of greasenipples with R 1/8, KR 1/8 and M10×1threads.

The following accessories can besupplied to specific order:

• grease nipple M1 G 1/8 (➔ fig ) and

• nipple connection LAPN 1/8 (➔ fig ).

Replacement of the standard greasenipple AH 1/8-27 PTF with the nippleM1 G 1/8 must be made by the user.

The nipple connection LAPN 1/8allows the easy installation of com-ponents having a thread G 1/4.

2

1

RelubricationThe ConCentra roller bearing unitsshould be relubricated with a similartype of grease, i.e. SKF LGEP 2. Theappropriate quantities are given in theproduct tables.

Before relubricating, the greasenipple and its immediate vicinityshould be carefully cleaned. The useof high pressure cleaning equipmentshould be avoided.

When relubricating the greaseshould be supplied slowly as the bear-ing rotates. Excessive pressure shouldbe avoided as otherwise the seals maybe damaged.

The SKF grease gun 1077600 (➔ fig ) is most suitable for use withConCentra roller bearing units. It issupplied with a 175 mm extensiontube with automatic grip. A 500 mmlong pressure tube 1077601 is avail-able as an accessory. The SKF greasegun

• can be used for grease cartridgesas well as “loose” grease,

• has a robust design, and • is easy to use.

3

Grease nipple M1 G 1/8

Nipple connectionLAPN 1/8

Grease gun 1077600 Grease metering unit LAGM 1000

To accurately measure the greasequantity, a grease metering unit LAGM1000 can also be supplied by SKF. Theunit can easily be attached to the SKFgrease gun 1077600 (➔ fig ).4

19

2


Page ................ 3 Relubrication Page .............. 26

Relubrication intervalsThe relubrication intervals tf for bearingson horizontal shafts under normal andclean conditions can be obtained fromdiagram as function of

• the speed factor A whereA = n × dmn = rotational speed, r/mindm = bearing mean diameter

(➔ table ), mm• the bearing factor bf

depending on the load conditions = 2 when Fa/Fr ≤ e = 6 when Fa/Fr > ewhere e is the limiting value (➔ product tables)

• the load ratio C/P

The relubrication interval tf is anestimated value, valid for an operatingtemperature of 70 °C, for example:

1

1

0

C/P ≥ 15

C/P ≈ 8

C/P ≈ 4 100

500

1 000

5 000

10 000

50 000

100 000

200 000 400 000 600 000 800 000

1Diagram

tf, operating hours

A bf

ConCentra roller Bearing bearing units meanSize codes diametermetric shaft inch shaft dm (mm)

35 – 53,540 1.7/16 60– 1.1/2 60

45 1.11/16 65– 1.3/4 6550 1.15/16 70

– 2 7055 2.3/16 77,560 – 85

65 2.7/16 92,5– 2.1/2 92,570 – 97,5

75 2.11/16 102,5– 2.3/4 102,5– 2.15/16 102,5

– 3 102,5– 3.7/16 125– 3.1/2 125

– 3.11/16 140– 3.15/16 140– 4 140

1Table

• ConCentra roller bearing unit SYT40 Lwith bearing mean diameter 60 mm,rotational speed 1 000 r/min, C/P ≈ 8and Fa/Fr < e needs to be relubri-cated every 8 000 hours.

• ConCentra roller bearing unit SYT 75 Lwith bearing mean diameter 102,5 mm,operating speed 1000 r/min, C/P ≈8 and Fa/Fr < e needs to be relubri-cated every 5 000 hours.

For bearings on vertical shafts, theintervals obtained from diagramshould be halved.

1

Bearing mean diameter

Relubrication intervals at operating temperatures of 70 °C

20

Trouble-Free Operation


Page ................ 3 Maintenance Page .............. 26

1Fig 2Fig

Correctly chosen and correctly mount-ed ConCentra roller bearing units arehighly reliable machine components –as long as adequate lubricant is avail-able and contaminants and moisturecannot penetrate.

In spite of this it is still advisable tomonitor the condition of ConCentraroller bearing units at regular intervalsor continuously, in order to detectbearing damage in good time and alsoto be able to assess the extent andprogress of the damage. It is thenpossible to plan the replacement ofdamaged units and avoid any un-planned stoppages. Routine checks ofthe noise and temperature should bemade and the units opticallyinspected.

Condition monitoring usingvibration analysisThe most reliable way of monitoring thecondition of ConCentra roller bearingunits is by vibration analysis (➔ fig ).This provides the best method of pre-dicting bearing damage. The ConCentraroller bearing units can be fitted withvibration sensors, and three locations

1

are provided on the housings for thispurpose.

SKF has a complete range of meas-uring equipment for condition monitor-ing, from light hand-held measuringpens to complex systems for perman-ent installation enabling the continuousmonitoring of bearings and machines.

The range also includes theMARLIN™ system (➔ fig ). Thismachine reliability inspection systemis designed for on site measurementsand allows data from over 2 000measuring points to be stored. Thesystem can be used to analyse thevibration velocity enabling machinemalfunction to be identified as well asthe envelope curve of vibration accel-eration to be produced which is usedto analyse the bearing function.

2

Details of SKF conditionmonitoring equipment can beobtained from SKF and fromauthorised SKF distributors.

The MARLIN™ machine reliabilityinspection systemRecording vibration values

Mounting and dismounting

21

2


Page ................ 3 Tools Page .............. 26

2Fig1Fig

Unit Double slot shimsBasic Basic designation Dimensions1)

designation A B C

– – mm

SYT 35 TMAS D3 80 230 22SYT 40SYT 45

SYT 50 TMAS D4 90 274 26SYT 55

SYT 60 TMAS D5 100 294 26SYT 65

SYT 70 TMAS D6 110 328 30SYT 75

1) All double slot shims are available in the following thicknesses: 0,05; 0,10; 0,25; 0,50 and 1,00 mm. A 0,25 mm thick shims TMAS D3 is designated TMAS D3-025

1Table

ToolsTo mount or dismount ConCentra rollerbearing units, the only tools requiredare

• a hexagonal key to tighten/loosenthe grub screws in the mountingrings, and

• a spanner to tighten/loosen theattachment bolts.

A key 3L to ISO 2936:1996 is suppliedwith each unit together with a torqueindicator (➔ fig ) and mountinginstructions are packed with each unit.These should be followed.

Double slot shimsTo enable to adjust for the heightdifferences between the supportsurfaces relative to the shaft, SKF cansupply double slot shims (➔ fig ) forthe ConCentra roller bearing units ofseries SYT. These shims, of seriesTMAS, are available in

• 4 different sizes, each having• 4 different thicknesses.

They fit all SYT units of sizes 35 to 75inclusive (➔ table ).1

2

1

Double slot shims for bearing units of series SYT

Key with torque indicator Double slot shims for ConCentra rollerbearing units of series SYT

NB.A grub screw of a ConCentra rollerbearing unit should never be tighten-ed until the unit is in position onthe shaft, as otherwise

• the adapter sleeve may bedeformed and/or

• the O-ring seal can be squashed.

The unit will then be impossible tomount.

B

A

CC

22


Page ................ 3 Installation Page .............. 26

MountingA label marked “MOUNT. SIDE/DISMOUNT. SIDE” shows the mountingand dismounting side, respectively, ofthe unit (➔ fig , page 15).

1. Determine the positions of thelocating and non-locating units.The locating unit should alwaysbe at the drive side.

2. Make sure that the base of theunit and the support surface areclean and free from burrs. For thesupport surface a flatness toler-ance within tolerance grade IT7 isrecommended. For less demand-ing applications IT8 may be satis-factory. Recommended max sur-face finish for the support surfaceis Ra = 12,5 µm. If the unit elevationis adjusted with shims these mustcover the whole contact area be-tween the unit and the supportsurface.

3. Make sure that the shaft is cleanand free from burrs and check thedimensional and form accuracy ofthe shaft. For the shaft a diametertolerance h9 and cylindricity toler-ance grade IT5 are recommended.For less demanding applicationsh10 and IT7 may be satisfactory.Recommended max surface finishfor the shaft is Ra = 3,2 µm. Lightlyoil the shaft bearing seatings with low-viscosity oil.

4. Mount any components which areto be on the shaft between thebearing positions.

5. Push the units on to the shaft withthe “dismounting side” leading.Leave 40 mm minimum spacebehind the unit to make dis-mounting possible.

6. Fasten the units to the supportsurface with the attachment bolts,but do not tighten.

7. Adjust the position of the units onthe support surface if necessary.

8. Position the shaft axially in the units.

3

9. Lock the locating bearing (SYT .. F)on the shaft.

9a. This is done by tightening thegrub screws in the “mountingside” ring using the hexagonalkey. Follow the tightening patterndepending on the numbers ofscrews (➔ adjacent illustration)and tighten 1/4 turn at the time.

9b. Tighten until the hexagonal keybows and comes at the samelevel as the mounted indicator. If a torque wrench is used therecommended tightening torqueis 7,4 Nm.

10. Check the unit alignment. Themaximum permissible misalign-ment of the shaft is 1,5°. Fullytighten the attachment bolts ofthe locating bearing unit. Therecommended tightening torquesare given in table , page 16.

11. Find the middle of the non-locating bearing seating in thehousing (SYT .. L)

– by supporting the shaft and– by pushing the unloaded

bearing from one end position inthe housing to the other.

11. If only thermal elongation of theshafts is expected it is recom-mended that the end positionopposite to the locating bearing be chosen as the seating.

12. Lock the non-locating bearing onthe shaft as under point 9.

13. Check the unit alignment. Themaximum permissible misalign-ment of the shaft is 1,5°. Fullytighten the attachment bolts ofthe non-locating bearing unit. Therecommended tightening torquesare given in table , page 16.

14. If applicable, snap the end coverinto the housing bore.

3

3

Tightening scheme for grub screws

23

2


Page ................ 3 Installation Page .............. 26

SKF ConCentra

SKFConCentra

SKF ConCentra

SKF ConCentra

6

9

11

5

14

SKF ConCentra

10

24


Page ................ 3 Removal Page .............. 26

DismountingA label marked “MOUNT. SIDE/DISMOUNT. SIDE” shows the mountingand dismounting side, respectively, ofthe unit (➔ fig , page 15).

1. Clean the bearing position and allthe internal hexagons of the grubscrews. Remove the end cover (if any).

2. Remove any rust or damage overwhich the bearing unit is to bewithdrawn.

3. Support the shaft with itscomponents.

4. Loosen the attachment bolts.

5. Loosen the grub screws in the“mounting side” ring 3 or 4 turns.

6. Tighten the two grub screws in the“dismounting side” ring alternatelyby 1/4 of a turn until a noticeable“POP” is heard or felt. If no “POP”is heard or felt, continue to tightenthe dismounting screws until thelong end of the hexagonal wrenchbows as maximum approx. 20 mm.If still no “POP” is heard or feltplease follow the instructions givenunder the heading “Warning”.

7. Loosen the grub screws in the“dismounting side” ring again by 3 or 4 turns.

8. Remove the attachment bolts.

9. Withdraw the unit from the shaft.

10. If the application permits, it isrecommended to remove all theattachment bolts and to lift out thecomplete arrangement of shaft withConCentra roller bearing units andother components. Then proceed asdescribed under points 5 to 9.

3

WarningOn no account should the grubscrews in the “dismounting side”ring be further tightened if thebearing and sleeve do not comefree.

In such a case the followingprocedure should be followed.

a The grub screws in the“dismounting side” ring shouldbe loosened again by 3 or 4turns.

b Then the grub screws in the“mounting side” ring should betightened until the long arm ofthe hexagonal key starts tobend noticeably.

c The procedure described underpoints 5 and 6 should then berepeated.

25

2


Page ................ 3 Removal Page .............. 26

SKF ConCentra

SKF ConCentra

SKF ConCentra

Restorvasting inportant tris

sarfriday is beingfang

SKF ConCentra

SKF ConCentra

Restorvasting inportant tris

sarfriday is beingfang

SKF ConCentra

1, 2

4

5

3

6

7

8

9

10

26


Page ................ 3 Page .............. 12 General

General product data

DimensionsConCentra roller bearing units ofseries SYT have dimensions thatconform to ISO 113-2:1999, plummerblock housing series 5 and are thusinterchangeable with other housings tothe same standard.

Internal clearanceConCentra roller bearing units aresupplied with pre-adjusted C3 radialinternal bearing clearance for atapered bore. The size and number of mounting set screws have beenchosen to obtain the correct internalclearance when the unit is properlymounted.

MisalignmentConCentra roller bearing units canaccommodate angular misalignmentsof up to 1,5 degrees between thebearing positions.

Axial displaceabilityThe permissible axial displacementfrom the central position for non-locating ConCentra roller bearing unitsis min 1,1 mm and from the end posi-tion min 2,2 mm.

Minimum loadIn order to provide satisfactoryoperation, spherical roller bearings inConCentra roller bearing units mustalways be subjected to a given min-imum load, especially if they are tooperate at high speeds or are sub-jected to high accelerations or rapidchanges in the direction of load. Undersuch conditions the inertia forces ofthe rollers and cages and the frictionin the lubricant can have a detrimentalinfluence on rolling conditions in thebearing arrangement and may causedamaging sliding movements to occurbetween the rollers and raceways.

The requisite minimum load to beapplied can be estimated using

P0m = 0,01 C0

whereP0m = minimum equivalent static load,

kNC0 = basic static load rating, kN

When starting up at low temperaturesor when the lubricant is highly viscous,even greater loads may be required.The weights of the components sup-ported by the bearing, together withexternal forces, often exceed the re-quisite minimum load. If this is not thecase, the bearing must be subjectedto an additional radial load, e.g. byincreasing belt tension or idling torqueor by the similar means.

SpeedsThe speeds at which ConCentra rollerbearing units can be operated dependon the seal design. Guideline valuesare given in the product tables.

The (thermal) reference speed listedin the product tables represent areference value that is to be used todetermine the permissible operationalspeed of the bearing subjected to acertain load and running with LGEP 2grease. Please refer to the SKFGeneral Catalogue, section “Speedsand vibration”. The values of thereference speed listed are in accordingwith ISO 15312.

For bearings with double lip seals,the speed is limited by the seal friction.

27

33


Page ................ 3 Page .............. 12 General

Load carrying ability of the housingsConCentra roller bearing units aredesigned for loads acting verticallytowards the support surface.

Guideline values for the breakingload P for housings of series SYT aregiven in table . Using these valuesand a safety factor which depends onthe operating conditions and reliabilityrequirements the permissible load canbe determined for the housing. Ingeneral engineering a safety factor of6 is often used.

In this connection it is important thatthe attachment bolts are properlytightened. When loads act at an anglein excess of 90° the bolts must beequally firmly tightened.

The guideline values for spheroidalgraphite cast iron housings can beobtained by multiplying the breakingloads given in table by a factor of 1,8.

The holding power of a ConCentraroller bearing unit depends on thefriction between the shaft and thelocking device. When correctly mountedthe locking device gives the ConCentraroller bearing unit a holding power ofapproximately 15 kN.

DesignationsThe complete designation of aConCentra roller bearing unit consistsof

• the housing series identification,• the size identification, i.e. the shaft

diameter in mm, uncoded, and• supplementary designations

identifying design, seal, housingmaterial and other features.

The designation scheme shown intable explains the significance ofthe various parts of the designation inthe order in which they appear.

2

1

1

Example SYT 45 LTS

Variants

– Two holes for attachment boltsF Four holes for attachment bolts

Basic designation

SYT Plummer block unit housing, series 5 to ISO 113:1999

Housing material

– Grey cast ironD Spheroidal graphite cast iron

Size

35 35 mm bore diameterto75 75 mm bore diameter

Type of arrangement

F Locating unitL Non-locating unit

Seals

– Double-lip sealsTS Labyrinth seals

Unit Breaking loadsBasic for housings of grey cast irondesignation P55° P90° P120° P150° P180°

– kN

SYT 35 250 150 95 85 105SYT 40 265 160 100 90 110SYT 45 280 170 110 100 115

SYT 50 330 200 130 115 140SYT 55 350 210 140 120 150SYT 60 365 220 150 130 170

SYT 65 380 230 155 140 210SYT 70 400 240 160 145 215SYT 75 415 250 165 150 220

1Table

2Table

Designation scheme

SYT 45 L TS

Breaking loads for ConCentra roller bearing units of series SYT

180°150°

120°

90°

55°

28

Shaft Bearing unitdia- Dimensions Mass Designations1)

meter Non-locating unit withda A B H H1 H2 J L N N1 G double-lip labyrinth

seals seals

mm mm kg –

35 60 59,5 110 60 25 170 205 20 15 12 3,40 SYT 35 L SYT 35 LTS

40 60 59,5 114 60 25 170 205 20 15 12 3,50 SYT 40 L SYT 40 LTS

45 60 59,5 116 60 25 170 205 20 15 12 3,60 SYT 45 L SYT 45 LTS

50 70 59,5 129 70 28 210 255 24 18 16 4,80 SYT 50 L SYT 50 LTS

55 70 59,5 135 70 30 210 255 24 18 16 5,40 SYT 55 L SYT 55 LTS

60 80 65,5 150 80 30 230 275 24 18 16 7,00 SYT 60 L SYT 60 LTS

65 80 65,5 157 80 30 230 280 24 18 16 8,00 SYT 65 L SYT 65 LTS

70 90 65,5 177 95 32 260 315 28 22 20 10,5 SYT 70 L SYT 70 LTS

75 90 65,5 182 95 32 260 320 28 22 20 11,5 SYT 75 L SYT 75 LTS

All ConCentra units have SKF Explorer bearings

1) Locating bearing units are identified by the suffix F instead of L, e.g. SYT 35 F or SYT 35 FTS


Page ................ 3 Page ..............12 ConCentra roller bearing units for metric shafts da 35 – 75 mm

H

H1

da

A

B

G

JL

H2

Non-locating bearing unitSYT .. L

Locating bearing unitSYT .. FTS

29

Unit Bearing Speed ratings Grease Appropriate end cover Basic Basic Basic load ratings Fatigue Calculation factors Double- Labyrinth quantity Designation Protrusiondesig- desig- dynamic static load limit lip seals seals Relubri- A5nation nation C C0 Pu e Y1 Y2 Y0 Limiting Reference cation

speed speed

– – kN kN – r/min g – mm

SYT 35 22207 86,5 85 9,3 0,31 2,2 3,3 2,2 4 400 9 000 10 ECY 207 22

SYT 40 22208 96,5 90 9,8 0,28 2,4 3,6 2,5 4 000 8 000 10 ECY 208 23,5

SYT 45 22209 102 98 10,8 0,26 2,6 3,9 2,5 3 700 7 500 10 ECY 209 23

SYT 50 22210 104 108 11,8 0,24 2,8 4,2 2,8 3 500 7 000 10 ECY 210 29,5

SYT 55 22211 125 137 13,7 0,24 2,8 4,2 2,8 3 250 6 300 15 ECY 211 34

SYT 60 22212 156 166 18,6 0,24 2,8 4,2 2,8 3 000 5 600 15 ECY 212 35,5

SYT 65 22213 193 216 24 0,24 2,8 4,2 2,8 2 900 5 300 20 ECY 213 35,5

SYT 70 22214 208 228 25,5 0,22 3 4,6 2,8 2 650 5 000 20 ECY 214 38,5

SYT 75 22215 212 240 26,5 0,22 3 4,6 2,8 2 600 4 800 20 ECY 215 38,5

33


Page ............... 3 Page ...............12

N

N1

JA5

30


Page ................ 3 Page .............. 12 Additional series

Series for inch shafts

31

3


Page ................ 3 Page .............. 12 Additional series

The standard range of ConCentraroller bearing units for metric shafts iscomplemented by several series andsizes of plummer block bearing unitsfor inch-size shafts of diameter 1 7/16

to 4 in, inclusive. These differ slightlyin their dimensions and designs. Therange includes units in the

• SYR .. N series, • SYE .. N series and • FSYE .. N series.

based on the SYR, SYE and FSYEplummer block units which have beensuccessful on the American market for many years. The most importanttechnical data for these units for inchshafts will be found on pages 32 to 39.

DesignationsThe complete designation of aConCentra roller bearing unit for inchshafts consists of:

• the housing series identification• the size identification, i.e. the shaft

diameter in inches, uncoded, and• supplementary designations

identifying design, seal and otherfeatures.

The designation scheme shown intable explains the significance ofthe various parts of the designation in the order in which they appear.

1

Designation scheme

Example FSYE 2.7/16 NH-118

Variants

– Two holes for attachment bolsF Four holes for attachment bols

Basic designation

SYE Plummer (pillow) block unit with cast housingSYR Plummer (pillow) block unit with cast housingFYR Flanged unit with round, flat back housingFYE Flanged unit with square, flat back housingFYRP Flanged unit with round spigot piloted housingTBR Take-up unit with cast housing

Size

1.7/16 1 7/16 in bore diameterto4 4 in bore diameter

Type of arrangement

N ConCentra designH Locating bearing unitY Closed end (end cover supplied)

Seals, others

– TriGard seals-118 Labyrinth seals

1Table

SYEF 2.7/16 NH -118

32

Shaft Bearing unitdiameter Dimensions Mass Designation1)

Non-locating unit da A B H H1 H2 J L N N1 G with TriGard contact

seals

in/mm in/mm lb/kg –

1 7/16 2 1/16 2 11/32 3 7/8 1 7/8 1 3/16 5 6 7/8 15/16 5/8 1/2 7.00 SYR 1.7/16 N36,512 52,4 59,5 98,4 47,6 30,2 127 174,6 23,8 15,9 3,18

1 1/2 2 1/16 2 11/32 3 7/8 1 7/8 1 3/16 5 6 7/8 15/16 5/8 1/2 7.00 SYR 1.1/2 N38,100 52,4 59,5 98,4 47,6 30,2 127 174,6 23,8 15,9 3,18

1 11/16 2 1/16 2 11/32 4 1/4 2 1/8 1 5/16 5 1/2 7 3/8 1 5/8 1/2 8.00 SYR 1.11/16 N42,862 52,4 59,5 108 54 33,3 139,7 187,3 25,4 15,9 3,62

1 3/4 2 1/16 2 11/32 4 1/4 2 1/8 1 5/16 5 1/2 7 3/8 1 5/8 1/2 8.00 SYR 1.3/4 N44,450 52,4 59,5 108 54 33,3 139,7 187,3 25,4 15,9 3,62

1 15/16 2 1/16 2 11/32 4 9/16 2 1/4 1 3/8 6 1/4 8 3/8 1 1/16 3/4 5/8 9.20 SYR 1.15/16 N49,212 52,4 59,5 115,9 57,2 34,9 158,8 212,7 27 19 4,17

2 2 1/16 2 11/32 4 9/16 2 1/4 1 3/8 6 1/4 8 3/8 1 1/16 3/4 5/8 9.20 SYR 2 N50,800 52,4 59,5 115,9 57,2 34,9 158,8 212,7 27 19 4,17

2 3/16 2 5/16 2 11/32 5 2 1/2 1 5/8 6 3/4 8 7/8 1 1/16 3/4 5/8 12.0 SYR 2.3/16 N55,562 58,7 59,5 127 63,5 41,3 171,5 225,4 27 19 5,44

2 7/16 2 9/16 2 37/64 5 11/16 2 3/4 1 3/4 7 1/8 9 1/4 1 1/16 3/4 5/8 16.0 SYR 2.7/16 N61,912 65,1 65,5 144,5 69,8 44,4 181 235 27 19 7,26

2 1/2 2 9/16 2 37/64 5 11/16 2 3/4 1 3/4 7 1/8 9 1/4 1 1/16 3/4 5/8 16.0 SYR 2.1/2 N63,500 65,1 65,5 144,5 69,8 44,4 181 235 27 19 7,26

2 11/16 2 9/16 2 37/64 6 7/16 3 1/4 2 1/4 8 1/8 10 7/16 1 3/16 7/8 3/4 22.0 SYR 2.11/16 N68,262 65,1 65,5 163,5 82,6 57,2 206,4 265,1 30,2 22,2 9,98

2 3/4 2 9/16 2 37/64 6 7/16 3 1/4 2 1/4 8 1/8 10 7/16 1 3/16 7/8 3/4 22.0 SYR 2.3/4 N69,850 65,1 65,5 163,5 82,6 57,2 206,4 265,1 30,2 22,2 9,98

2 15/16 2 9/16 2 37/64 6 7/16 3 1/4 2 1/4 8 1/8 10 7/16 1 3/16 7/8 3/4 21.0 SYR 2.15/16 N74,612 65,1 65,5 163,5 82,6 57,2 206,4 265,1 30,2 22,2 9,53

3 2 9/16 2 37/64 6 7/16 3 1/4 2 1/4 8 1/8 10 7/16 1 3/16 7/8 3/4 21.0 SYR 3 N76,200 65,1 65,5 163,5 82,6 57,2 206,4 265,1 30,2 22,2 9,53

3 7/16 2 15/16 3 9/64 7 1/2 3 3/4 2 1/4 10 13 1 3/4 1 7/8 31.5 SYR 3.7/16 N87,312 74,6 80 190,5 95,2 57,2 254 330,2 44,5 25,4 14,3

3 1/2 2 15/16 3 9/64 7 1/2 3 3/4 2 1/4 10 13 1 3/4 1 7/8 31.5 SYR 3.1/2 N88,900 74,6 80 190,5 95,2 57,2 254 330,2 44,5 25,4 14,3


With non-locating bearing units, the maximum possible axial displacement from the central position is 0,8 mm

1) Locating bearing units are identified by the suffix H, e.g. SYR 1.7/16 NH. Bearing units with labyrinth seals are identified by the sufix -118, e.g. SYR 1.7/16 N-118 or SYR 1.7/16 NH-118

H

H1

ad

A

B


Page ................ 3 Page .............. 12 ConCentra roller bearing unitsSYR .. N for inch shaftsda 1 7/16 – 3 1/2 in

33

Unit Bearing Speed ratings GreaseDesignation Basic Basic load ratings Fatigue Calculation factors TriGard Labyrinth quantity

desig- dynamic static load limit seals seals Relubricationnation C C0 Pu e Y1 Y2 Y0 Limiting Reference

speed speed

– – lbs/kN Ibs/kN – r/min oz/g

SYR 1.7/16 N 22208 21 600 20 000 2 200 0,28 2,4 3,6 2,5 2 500 8 000 0.35 96,5 90 9,8 10

SYR 1.1/2 N 22208 21 600 20 000 2 200 0,28 2,4 3,6 2,5 2 500 8 000 0.35 96,5 90 9,8 10

SYR 1.11/16 N 22209 22 800 22 000 2 400 0,26 2,6 3,9 2,5 2 300 7 500 0.35 102 98 10,8 10

SYR 1.3/4 N 22209 22 800 22 000 2 400 0,26 2,6 3,9 2,5 2 300 7 500 0.35 102 98 10,8 10

SYR 1.15/16 N 22210 23 300 24 200 2 650 0,24 2,8 4,2 2,8 2 150 7 000 0.35 104 108 11,8 10

SYR 2 N 22210 23 300 24 200 2 650 0,24 2,8 4,2 2,8 2 150 7 000 0.35 104 108 11,8 10

SYR 2.3/16 N 22211 28 100 30 700 3 070 0,24 2,8 4,2 2,8 2 000 6 300 0.53125 137 13,7 15

SYR 2.7/16 N 22213 43 000 48 000 5 380 0,24 2,8 4,2 2,8 1 800 5 300 0.70193 216 24 20

SYR 2.1/2 N 22213 43 000 48 000 5 380 0,24 2,8 4,2 2,8 1 800 5 300 0.70193 216 24 20

SYR 2.11/16 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 20

SYR 2.3/4 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 20

SYR 2.15/16 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 20

SYR 3 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 200

SYR 3.7/16 N 22218 73 500 85 000 8 740 0,24 2,8 4,2 2,8 1 400 3 800 1.25325 375 39 35

SYR 3.1/2 N 22218 73 500 85 000 8 740 0,24 2,8 4,2 2,8 1 400 3 800 1.25325 375 39 35

33

G

JL

H2 N

J

N1


Page ................ 3 Page .............. 12

34


Non-locating unit da A B H H1 H2 J L N N1 G with TriGard contact

seals


3 11/16 3 5/16 3 9/64 8 7/16 4 1/4 2 1/2 10 7/8 14 1/4 2 1 1/8 1 44.5 SYR 3.11/16 N93,662 84,1 80 214,3 108 63,5 276,2 362 50,8 28,6 20,2

3 15/16 3 15/16 3 9/64 8 7/16 4 1/4 2 1/2 10 7/8 14 1/4 2 1 1/8 1 43.5 SYR 3.15/16 N100,012 84,1 80 214,3 108 63,5 276,2 362 50,8 28,6 19,7

4 3 15/16 3 9/64 8 7/16 4 1/4 2 1/2 10 7/8 14 1/4 2 1 1/8 1 43.5 SYR 4 N101,600 84,1 80 214,3 108 63,5 276,2 362 50,8 28,6 19,7



1) Locating bearing units are identified by the suffix H, e.g. SYR 3.11/16 NH. Bearing units with labyrinth seals are identified by the sufix -118, e.g. SYR 3.11/16 N-118 or SYR 3.11/16 NH-118

H

H1

ad

A

B


Page ................ 3 Page .............. 12 ConCentra roller bearing unitsSYR .. N for inch shaftsda 3 11/16 – 4 in

35

33



speed speed


SYR 3.11/16 N 22220 95 000 110 000 10 980 0,24 2,8 4,2 2,8 1 250 3 400 1.60425 490 49 45

SYR 3.15/16 N 22220 95 000 110 000 10 980 0,24 2,8 4,2 2,8 1 250 3 400 1.60425 490 49 45

SYR 4 N 22220 95 000 110 000 10 980 0,24 2,8 4,2 2,8 1 250 3 400 1.60425 490 49 45

G

JL

H2 N

J

N1


Page ................ 3 Page .............. 12

36


Non-locating unitda A B H H1 H2 J J1 L N N1 G with TriGard contact

seals


1 7/16 2 1/8 2 11/32 3 7/8 1 7/8 1 1/8 5 3/4 – 7 3/8 3/4 5/8 1/2 8.00 SYE 1.7/16 N36,512 54 59,5 98,4 47,6 28,6 146 – 187,3 19 15,9 3,62

1 1/2 2 3/8 2 11/32 4 1/4 2 1/8 1 1/4 6 1/4 – 7 7/8 3/4 5/8 1/2 8.00 SYE 1.1/2 N38,100 60,3 59,5 108 54 31,8 158,8 – 200 19 15,9 3,62

1 11/16 2 3/8 2 11/32 4 1/4 2 1/8 1 1/4 6 1/4 – 7 7/8 3/4 5/8 1/2 9.30 SYE 1.11/16 N42,862 60,3 59,5 108 54 31,8 158,8 – 200 19 15,9 4,22

1 3/4 2 1/2 2 11/32 4 1/2 2 1/4 1 5/16 7 – 8 7/8 7/8 3/4 5/8 9.30 SYE 1.3/4 N44,450 63,5 59,5 114,3 57,2 33,3 177,8 – 225,4 22,2 19 4,22

1 15/16 2 1/2 2 11/32 4 1/2 2 1/4 1 5/16 7 – 8 7/8 7/8 3/4 5/8 10.5 SYE 1.15/16 N49,212 63,5 59,5 114,3 57,2 33,3 177,8 – 225,4 22,2 19 4,76

2 2 1/2 2 11/32 4 1/2 2 1/4 1 5/16 7 – 8 7/8 7/8 3/4 5/8 10.5 SYE 2 N50,800 63,5 59,5 114,3 57,2 33,3 177,8 – 225,4 22,2 19 4,76

2 3/16 2 5/8 2 11/32 5 2 1/2 1 1/2 7 3/4 – 9 5/8 7/8 3/4 5/8 13.5 SYE 2.3/16 N55,562 66,7 59,5 127 63,5 38,1 196,8 – 244,4 22,2 19 6,12

2 7/16 2 7/8 2 37/64 5 11/16 2 3/4 1 5/8 8 1/2 – 10 1/2 1 3/4 5/8 18.5 SYE 2.7/16 N61,912 73 65,5 144,5 69,8 41,3 216 – 266,7 25,4 19 8,39

3 1/2 2 37/64 5 11/16 2 3/4 1 5/8 8 1/2 1 7/8 10 1/2 1 3/4 5/8 19.0 FSYE 2.7/16 N88,9 65,5 144,5 69,8 41,3 216 47,6 266,7 25,4 19 8,62

2 1/2 2 7/8 2 37/64 5 11/16 2 3/4 1 5/8 8 1/2 – 10 1/2 1 3/4 5/8 18.5 SYE 2.1/2 N63,500 73 65,5 144,5 69,8 41,3 216 – 266,7 25,4 19 8,39

3 1/2 2 37/64 5 11/16 2 3/4 1 5/8 8 1/2 1 7/8 10 1/2 1 3/4 5/8 19.0 FSYE 2.1/2 N88,9 65,5 144,5 69,8 41,3 216 47,6 266,7 25,4 19 8,62

2 11/16 3 2 37/64 6 5/16 3 1/8 1 7/8 9 1/2 – 12 1 1/8 7/8 3/4 25.5 SYE 2.11/16 N68,262 76,2 65,5 160,3 79,4 47,6 241,3 – 304,8 28,6 22,2 11,6

4 2 37/64 6 5/16 3 1/8 1 7/8 9 1/2 2 1/8 12 1 1/8 3/4 5/8 25.5 FSYE 2.11/16 N101,6 65,5 160,3 79,4 47,6 241,3 54 304,8 28,6 19 11,6

2 3/4 3 2 37/64 6 5/16 3 1/8 1 7/8 9 1/2 – 12 1 1/8 7/8 3/4 25.5 SYE 2.3/4 N69,850 76,2 65,5 160,3 79,4 47,6 241,3 – 304,8 28,6 22,2 11,6

4 2 37/64 6 5/16 3 1/8 1 7/8 9 1/2 2 1/8 12 1 1/8 3/4 5/8 25.5 FSYE 2.3/4 N101,6 65,5 160,3 79,4 47,6 241,3 54 304,8 28,6 19 11,6



1) Locating bearing units are identified by the suffix H, e.g. SYE 1.7/16 NH. Bearing units with labyrinth seals are identified by the sufix -118, e.g. SYE 1.7/16 N-118 or FSYE 2.7/16 NH-118

H

H1

ad

A

B

SYE FSYE


Page ................ 3 Page .............. 12 ConCentra roller bearing unitsSYE .. N and FSYE .. N for inch shaftsda 1 7/16 – 2 3/4 in

37



speed speed


SYE 1.7/16 N 22208 21 600 20 000 2 200 0,28 2,4 3,6 2,5 2 500 8 000 0.3596,5 90 9,8 10

SYE 1.1/2 N 22208 21 600 20 000 2 200 0,28 2,4 3,6 2,5 2 500 8 000 0.3596,5 90 9,8 10

SYE 1.11/16 N 22209 22 800 22 000 2 400 0,26 2,6 3,9 2,5 2 300 7 500 0.35102 98 10,8 10

SYE 1.3/4 N 22209 22 800 22 000 2 400 0,26 2,6 3,9 2,5 2 300 7 500 0.35102 98 10,8 10

SYE 1.15/16 N 22210 23 300 24 200 2 650 0,24 2,8 4,2 2,8 2 150 7 000 0.35104 108 11,8 10

SYE 2 N 22210 23 300 24 200 2 650 0,24 2,8 4,2 2,8 2 150 7 000 0.35104 108 11,8 10

SYE 2.3/16 N 22211 28 100 30 700 3 070 0,24 2,8 4,2 2,8 2 000 6 300 0.53125 137 13,7 15

SYE 2.7/16 N 22213 43 000 48 000 5 380 0,24 2,8 4,2 2,8 1 800 5 300 0.70193 216 24 20

FSYE 2.7/16 N 22213 43 000 48 000 5 380 0,24 2,8 4,2 2,8 1 800 5 300 0.70193 216 24 20

SYE 2.1/2 N 22213 43 000 48 000 5 380 0,24 2,8 4,2 2,8 1 800 5 300 0.70193 216 24 20

FSYE 2.1/2 N 22213 43 000 48 000 5 380 0,24 2,8 4,2 2,8 1 800 5 300 0.70193 216 24 20

SYE 2.11/16 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 20

FSYE 2.11/16 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 20

SYE 2.3/4 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 20

FSYE 2.3/4 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 20

33

G

JL

H2N

J

N1

SYE

N

J

N1

J1

FSYE


Page ................ 3 Page .............. 12

38


Non-locating unitda A B H H1 H2 J J1 L N N1 G with TriGard contact

seals


2 15/16 3 2 37/64 6 5/16 3 1/8 1 7/8 9 1/2 – 12 1 1/8 7/8 3/4 24.0 SYE 2.15/16 N74,612 76,2 65,5 160,3 79,4 47,6 241,3 – 304,8 28,6 22,2 10,9

4 2 37/64 6 5/16 3 1/8 1 7/8 9 1/2 2 1/8 12 1 1/8 3/4 5/8 24.0 FSYE 2.15/16 N101,6 65,5 160,3 79,4 47,6 241,3 54 304,8 28,6 19 10,9

3 3 2 37/64 6 5/16 3 1/8 1 7/8 9 1/2 – 12 1 1/8 7/8 3/4 23.5 SYE 3 N76,200 76,2 65,5 160,3 79,4 47,6 241,3 – 304,8 28,6 22,2 10,7

4 2 37/64 6 5/16 3 1/8 1 7/8 9 1/2 2 1/8 12 1 1/8 3/4 5/8 24.0 FSYE 3 N101,6 65,5 160,3 79,4 47,6 241,3 54 304,8 28,6 19 10,9

3 7/16 3 5/8 3 9/64 7 1/2 3 3/4 2 1/4 11 – 14 1 5/16 1 7/8 35.5 SYE 3.7/16 N87,312 92,1 80 190,5 95,2 57,2 279,4 – 355,6 33,3 25,4 16,1

4 1/2 3 9/64 7 1/2 3 3/4 2 1/4 11 2 3/8 14 1 5/16 7/8 3/4 36.5 FSYE 3.7/16 N114,3 80 190,5 95,2 57,2 279,4 60,3 355,6 33,3 22,2 16,6

3 1/2 3 5/8 3 9/64 7 1/2 3 3/4 2 1/4 11 – 14 1 5/16 1 7/8 35.5 SYE 3.1/2 N88,900 92,1 80 190,5 95,2 57,2 279,4 – 355,6 33,3 25,4 16,1

4 1/2 3 9/64 7 1/2 3 3/4 2 1/4 11 2 3/8 14 1 5/16 7/8 3/4 36.5 FSYE 3.1/2 N114,3 80 190,5 95,2 57,2 279,4 60,3 355,6 33,3 22,2 16,6

3 11/16 4 1/2 3 9/64 8 9/16 4 1/4 2 7/16 12 1/2 2 1/4 15 1/4 1 3/8 7/8 3/4 50.5 FSYE 3.11/16 N93,662 114,3 80 217,5 108 61,9 317,5 57,2 387,4 34,9 22,2 22,9

3 15/16 4 1/2 3 9/64 8 9/16 4 1/4 2 7/16 12 1/2 2 1/4 15 1/4 1 3/8 7/8 3/4 49.5 FSYE 3.15/16 N100,012 114,3 80 217,5 108 61,9 317,5 57,2 387,4 34,9 22,2 22,5

4 4 1/2 3 9/64 8 9/16 4 1/4 2 7/16 12 1/2 2 1/4 15 1/4 1 3/8 7/8 3/4 49.5 FSYE 4 N101,600 114,3 80 217,5 108 61,9 317,5 57,2 387,4 34,9 22,2 22,5



1) Locating bearing units are identified by the suffix H, e.g. SYE 2.15/16 NH. Bearing units with labyrinth seals are identified by the sufix -118, e.g. SYE 2.15/16 N-118 or FSYE 2.15/16 NH-118


Page ................ 3 Page .............. 12 ConCentra roller bearing unitsSYE .. N and FSYE .. N for inch shaftsda 2 15/16 – 4 in

H

H1

ad

A

B

SYE FSYE

39

33



speed speed


SYE 2.15/16 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 20

FSYE 2.15/16 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 20

SYE 3 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 20

FSYE 3 N 22215 47 500 54 000 5 940 0,22 3 4,6 2,8 1 600 4 800 0.70212 240 26,5 20

SYE 3.7/16 N 22218 73 500 85 000 8 740 0,24 2,8 4,2 2,8 1 400 3 800 1.25325 375 39 35

FSYE 3.7/16 N 22218 73 500 85 000 8 740 0,24 2,8 4,2 2,8 1 400 3 800 1.25325 375 39 35

SYE 3.1/2 N 22218 73 500 85 000 8 740 0,24 2,8 4,2 2,8 1 400 3 800 1.25325 375 39 35

FSYE 3.1/2 N 22218 73 500 85 000 8 740 0,24 2,8 4,2 2,8 1 400 3 800 1.25325 375 39 35

FSYE 3.11/16 N 22220 95 000 110 000 10 980 0,24 2,8 4,2 2,8 1 250 3 400 1.60425 490 49 45

FSYE 3.15/16 N 22220 95 000 110 000 10 980 0,24 2,8 4,2 2,8 1 250 3 400 1.60425 490 49 45

FSYE 4 N 22220 95 000 110 000 10 980 0,24 2,8 4,2 2,8 1 250 3 400 1.60425 490 49 45

N

J

N1

N

J

N1

J1

FSYESYE

G

JL

H2


Page ................ 3 Page .............. 12

40

Other SKF bearing units

Other roller bearing unitsIn addition to ConCentra roller bearingunits, the following units (mountedbearings) are also available

• plummer block units in the SYR,SYE and FSYE series

• flanged units in the FYR and FYRPseries

• take-up units in the TBR series.

The mounted bearings have beenavailable on the American market formany years and have proved theirgood performance. They differ fromthe ConCentra roller bearing units inthe design of the bearing and itsattachment to the shaft. Instead of

the stepped sleeve, the bearings aresecured on the shaft by a lockingcollar with two grub (set) screws which pass through holes in the bearinginner ring.

These units with locking collar aredimensionally interchangeable withsimilar units on the American marketbut have an appreciable advantage inthat they incorporate SKF sphericalroller bearings.

SKF units of series SYR canreplace plummer block units ofseries P2B-SN 2000, ZA as well as P(E)-B22400 H; SYE units canreplace series E, EP-B22400 Hand ZEP; FSYE units with fourholes for attachment bolts in thefoot can replace series E, EP-B22400-FH and ZEP.

41

33

ConCentra ball bearing unitsConCentra ball bearing units are acompletely new addition to the SKFassortment. Units are available for

• metric shafts in the diameter range25 to 60 mm, inclusive, and

• inch-size shafts in the diameterrange 1 to 2 15/16 in, also inclusive

The units are based on the SKF SYcast iron plummer block design, which makes the ConCentra unitsdimensionally interchangeable. Theyare recommended for bearing applica-tions that operate at high speedsunder moderate loads and provide:

• quiet running with minimumvibration,

• long operating periods,• easy mounting and dismounting

with no damage to the shaft• minimal fretting corrosion

More detailed information on theseConCentra bearing units will besupplied on request.

Y-bearing unitsY-bearing units are ready-to-mountand ready-to-operate bearing units.Instead of the spherical roller bearingsof ConCentra roller bearing units, they

incorporate Y-bearings based on deepgroove ball bearings in the 62 series.

SKF Y-bearing units are available ina variety of designs. The housings areavailable as

• plummer block housings,• flanged housings and• take-up housings.

All these housing designs are availablein grey cast iron, the plummer block andflanged designs are also produced inpressed steel and polyamide versions.

There are three different means ofattachment to the shaft. Thus, theinner ring which is extended at one orboth sides has

• two grub screws, or• an eccentric ring with one grub

screw, or• a tapered bore for adapter sleeve

mounting.

The choice is even wider than indicatedabove as there is also a choice of

• three seal variants,• two material variants, and• several different grease fills.

More information about

• collar mounted roller bearingunits (➔ catalogue 100-700)

• ConCentra ball bearing units (➔ brochure 5107)

• Y-bearing units (➔ catalogue 5001)

42

The business of the SKF Group con-sists of the design, manufacture andmarketing of the world’s leading brandof rolling bearings, with a global leader-ship position in complementary prod-ucts such as radial seals. SKF alsoholds an increasingly important pos-ition in the market for linear motion products, high precision aerospacebearings, machine tool spindles, plantmaintenance services and is an estab-lished producer of high-quality bearing steel.

The SKF Group maintains special-ized businesses to meet the needs ofthe global marketplace. SKF supportsspecific market segments with ongoingresearch and development efforts thathave led to a growing number of in-novations, new standards and newproducts.

SKF Group has global ISO 14001environmental certification. Individualdivisions have been approved for quality certification in accordance with either ISO 9000 or appropriate industry specific standards.

Some 80 manufacturing sites world-wide and sales companies in 70 coun-tries make SKF a truly internationalcorporation. In addition, our 7 000 distributor and dealer partners aroundthe world, e-business marketplace andglobal distribution system put SKFclose to customers for the supply ofboth products and services. In essence,SKF solutions are available whereverand whenever our customers needthem.

Overall, the SKF brand now standsfor more than ever before. It stands forthe knowledge engineering companyready to serve you with world-classproduct competences, intellectualresources and the vision to help yousucceed.

SKF – The knowledge engineering company

Harnessing wind powerThe growing industry of wind-generatedelectric power provides an environmentallycompatible source of electricity. SKF isworking closely with global industry lead-ers to develop efficient and trouble-free turbines, using SKF knowledge to providehighly specialized bearings and conditionmonitoring systems to extend equipmentlife in the extreme and often remote en-vironments of wind farms.

Developing a cleaner cleanerThe electric motor and its bearings are theheart of many household appliances. SKFworks closely with appliance manufacturersto improve their product’s performance, cutcosts and reduce weight. A recent

example produced a new generation ofvacuum cleaners with substantially moresuction. SKF’s knowledge in small bearingtechnology is also applied to manufacturersof power tools and office equipment.

Delivering asset efficiency optimizationTo optimize efficiency and boost product-ivity, many industrial facilities outsource some or all of their maintenance services to SKF, often with guaranteed perform-ance contracts. Through the specializedcapabilities and knowledge available from

SKF Reliability Systems, SKF provides acomprehensive range of asset efficiencyservices, from maintenance strategies andengineering assistance, to operator-drivenreliability and machine maintenance programs.

43

Creating a new “cold remedy”In the frigid winters of northern China, sub-zero temperatures can cause rail carwheel assemblies and their bearings toseize due to lubrication starvation. SKF created a new family of synthetic lubri-cants formulated to retain their lubricationviscosity even at these extreme bearingtemperatures. SKF’s knowledge of lubri-cants and friction are unmatched throughout the world.

Evolving by-wire technology SKF has unique expertize and knowledge in fast growing by-wire technology, from fly-by-wire, to drive-by-wire, to work-by-wire. SKF pioneered practical fly-by-wiretechnology and is a close working part-ner with all aerospace industry leaders. As an example, virtually all aircraft of theAirbus design use SKF by-wire systems for cockpit flight control. SKF is also a leader in automotive drive-by-wire,

having jointly developed the revolutionaryFilo and Novanta concept cars whichemploy SKF mechatronics for steering and braking. Further by-wire develop-ment has led SKF to produce an all-electric forklift truck which uses mecha-tronics rather than hydraulics for all controls.

Planning for sustainable growth By their very nature, bearings make a posi-tive contribution to the natural environment.Reduced friction enables machinery tooperate more efficiently, consume lesspower and require less lubrication. SKF iscontinually raising the performance bar,enabling new generations of high-efficiencyproducts and equipment. With an eye tothe future, SKF’s global policies and manu-facturing techniques are planned andimplemented to help protect and preservethe earth’s limited natural resources. Weremain committed to sustainable, environ-mentally responsible growth.

Maintaining a 320 km/h R&D labIn addition to SKF’s renowned research and development facilities in Europe andthe United States, Formula One car racingprovides a unique environment for SKF topush the limits of bearing technology. Forover 50 years, SKF products, engineeringand knowledge have helped make

Scuderia Ferrari a formidable force in F1racing. (The average racing Ferrari utilizesmore than 150 SKF components.) Lessonslearned here are applied to the products we provide to automakers and the after-market worldwide.

R

® SKF is a registered trademark of the SKF Group.™ MARLIN is a trademark of the SKF Group.

© Copyright SKF 2003The contents of this publication are the copyright of the publisher and may not be reproduced (even extracts) unless permission is granted. Every care has been taken to ensure the accuracy of the information contained in this pub-lication but no liability can be accepted for any loss or damage whether direct, indirect or consequential arising out of the use of the information contained herein.

Publication 5103 E · October 2003

Printed in Sweden on environmentally friendly, chlorine-free paper (Multiart Silk)by Hyltebruks Tryckeri AB. www.skf.com

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