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TIMKENoverviewShelf Life and storageof grease-lubricated bearingsand componentsSTORAGETimken guidelines for the shelf life of grease-lubricated rollingbearings, components and assemblies are set forth below.Shelf life information is based on test data and experience.Shelf life should be distinguished from lubricated bearing/component design life as follows: Unless directed otherwise by Timken, Products should beShelf Life policyShelf life of the grease-lubricated bearing/componentrepresents the period of time prior to use or installation. Theshelf life is a portion of the anticipated aggregate design life. Itis impossible to accurately predict design life due to variationsin lubricant bleed rates, oil migration, operating conditions,installation conditions, temperature, humidity and extendedstorage.Shelf life values, available from Timken, represent a maximumlimit – and assume adherence to the Timken suggested storageand handling guidelines. Deviations from Timken’s storage andhandling guidelines may reduce shelf life. Any specification oroperating practice that defines a shorter shelf life should beused. Timken cannot anticipate the performance of the greaselubricant after the bearing or component is installed or placedin service.TIMKEN IS NOT RESPONSIBLE FOR THE SHELF LIFEOF ANY BEARING/COMPONENT LUBRICATED BYANOTHER PARTYEuropean REACH complianceTimken-branded lubricants, greases and similar products soldin stand-alone containers or delivery systems are subject tothe European REACH (Registration, Evaluation, Authorizationand Restriction of CHemicals) directive. For import into theEuropean Union, Timken can sell and provide only thoselubricants and greases that are registered with ECHA(European CHemical Agency). For further information,please contact your Timken engineer.6TIMKEN CYLINDRICAL ROLLER BEARING CATALOGTimken suggests the following storage guidelines for itsfinished products (bearings, components and assemblies,hereinafter referred to as “Products”):kept in their original packaging until they are ready to beplaced into service. Do not remove or alter any labels or stencil markings on thepackaging. Products should be stored in such a way that the packagingis not pierced, crushed or otherwise damaged. After a Product is removed from its packaging, it should beplaced into service as soon as possible. When removing a Product that is not individually pack-aged from a bulk pack container, the container should beresealed immediately after the Product is removed. Do not use Product that has exceeded its shelf life asdefined in Timken’s shelf life guidelines statement. The storage area temperature should be maintainedbetween 0º C (32º F) and 40º C (104º F); temperaturefluctuations should be minimized. The relative humidity should be maintained below60 percent and the surfaces should be dry. The storage area should be kept free from airbornecontaminants such as, but not limited to, dust, dirt, harmfulvapors, etc. The storage area should be isolated from undue vibration. Extreme conditions of any kind should be avoided.Inasmuch as Timken is not familiar with a customer’sparticular storage conditions, these guidelines are stronglysuggested. However, the customer may very well be requiredby circumstance or applicable government requirements toadhere to stricter storage requirements.

TIMKENOverviewAMost bearingtypes are typicallyshipped protectedwith a corrosionpreventive compoundthat is not a lubricant.Such bearings may beused in oil-lubricatedapplications withoutremoval of the corrosionpreventive compound. Whenusing some specialized greaselubrications, it is advisable to removethe corrosion-preventive compound beforepacking the bearings with suitable grease.Some bearing types in this catalog are pre-packed withgeneral purpose grease suitable for their normal application.Frequent replenishment of the grease may be necessary foroptimum performance. Care must be exercised in lubricantselection, however, since different lubricants are oftenincompatible.When specified by the customer, other bearings may beordered pre-lubricated.Upon receipt of a bearing shipment, ensure that the bearingsare not removed from their packaging until they are readyfor mounting so that they do not become corroded orcontaminated. Bearings should be stored in an appropriateatmosphere in order that they remain protected for theintended period.WarningFailure to observe the following warnings couldcreate a risk of death or serious injury.Proper maintenance and handling practices are critical.Always follow installation instructions andmaintain proper lubrication.Never spin a bearing with compressed air.The rollers may be forcefully expelled.Warnings for this product line are found in this catalogand posted on www.timken.com/warningsAny questions concerning shelf life or storage should bedirected to your local sales office.TIMKEN CYLINDRICAL ROLLER BEARING CATALOG7

CYLINDRICAL ROLLER BEARING introductionTimken Cylindrical RollerBearings - Offering Selection andSuperior PerformanceYour success depends on the performance of your equipment,especially when it faces harsh environments and high radialloads. To keep your uptime high and downtime low, turn toTimken cylindrical roller bearings.Industry presenceTimken cylindrical roller bearings effectively reduce friction andhelp transmit power in applications like: Power generation Oil fields Crop shears Gear drives Hoists Metals construction Mining Aggregate processing Pumps Rolling mills Wheel-end planetaries Wind energy Other industrial equipmentThe Timken differenceCooler operating temperatures. High durability. Longer-lastingperformance. A wide range of sizes. Our brand stands forhigh quality, reliability and outstanding performance. Yourapplications may run better, produce more and experienceimproved uptime when equipped with Timken cylindrical rollerbearings. As a result, you see a reduction in overall operatingcosts.Each bearing is backed by a skilled team of global experts,providing you with the industry’s best design, applicationknowledge and 24/7 field-engineering support.A radial cylindrical roller bearing consists of an inner and/orouter ring and a complement of controlled-contour cylindricalrollers. Depending on the style of bearing, either the inner orthe outer ring will have two roller-guiding ribs. The other ring,separable from the assembly, has one rib or none. The ringwith two ribs axially locates the position of the roller assembly.The diameters of these ribs may be used to support the roller.One of the ribs may carry light thrust loads when an opposingrib is provided in the mating ring.Ensuring qualityThe quality of our materials is just as important as ourdesigns in helping machines run more efficiently. We’re theonly bearing manufacturer in the world that makes our ownsteel. By using clean, high-alloy steel in our cylindrical rollerbearings, we can ensure the overall quality of our product.We also implement our Worldwide Quality Standards inevery manufacturing facility so that each bearing meetsthe same performance standards wherever in the world it’smanufactured.Product OfferingYou can select product from a complete line of highperformance cylindrical roller bearings. Our product lineincludes full-complement, one-, two- and four-row designs, alldeveloped to meet your application requirements. Sizes rangefrom 60 mm (2.5591 in.) to 2000 mm (78.7402 in).Updates are made periodically to this catalog. Visitwww.timken.com for the most recent version of the CylindricalRoller Bearing Catalog.Table 1. Radial Cylindrical roller bearingtypes and sizesBearing TypeSingle-rowDesign featuresFeaturing premium cages, unique internal geometries,enhanced surface textures and compact designs, thesebearings meet or exceed expectations for longer bearing life.8TIMKEN CYLINDRICAL ROLLER BEARING CATALOGFull-complement (NCF)Available Size Range60 - 2000 mm (2.3622 - 78.7402 in.)100 - 2000 mm (3.9370 - 78.7402 in.)Two-row80 - 2000 mm (3.1496 - 78.7402 in.)Four-row140 - 2000 mm (4.7244 - 78.7402 in.)

ENGINEERINGEngineeringThe following topics are covered within thisengineering section: Cylindrical roller bearing design types. Cage design types. Fitting practice and mounting recommendations. Lubrication recommendations.This engineering section is not intended to becomprehensive, but does serve as a useful guide incylindrical roller bearing selection.To view the complete engineering catalog, please visitwww.timken.com. To order the catalog, please contactyour Timken engineer and request a copy of the TimkenEngineering Manual, order number 10424.TIMKEN CYLINDRICAL ROLLER BEARING CATALOG9

EngineeringBearing types and cagesAradial cylindrical ROLLER BEARING Types and cagesRadial cylindrical roller bearings can offer higher radial load capacity than other bearing designs.The Timken Company offers a wide range of full complement, one -, two -, and four-row designsto meet various application requirements.radial cylindrical ROLLER BEARINGSStandard StylesTimken cylindrical roller bearings consist of an inner and outerring, a roller-retaining cage, and a complement of controlledcontour cylindrical rollers. Depending on the type of bearing,either the inner or the outer ring has two roller-guiding ribs. Theother ring is separable from the assembly and has one rib ornone. The ring with two ribs axially locates the position of theroller assembly. The ground diameters of these ribs may be usedto support the roller cage. One of the ribs may be used to carrylight thrust loads when an opposing rib is provided.The decision as to which ring should be double ribbed is normallydetermined by considering assembly and mounting proceduresin the application.Type NU has double-ribbed outer and straight inner rings. Type Nhas double-ribbed inner and straight outer rings. The use of eithertype at one position on a shaft is ideal for accommodating shaftexpansion or contraction. The relative axial displacement of onering to the other occurs with minimum friction while the bearingis rotating. These bearings may be used in two positions for shaftsupport if other means of axial location are provided.Type NJ has double-ribbed outer and single-ribbed innerrings. Type NF has double-ribbed inner and single-ribbed outerrings. Both types can support heavy radial loads, as well aslight unidirectional thrust loads. The thrust load is transmittedbetween the diagonally opposed rib faces in a sliding action.When limiting thrust conditions are approached, lubrication canbecome critical. Your Timken engineer should be consulted forassistance in such applications. When thrust loads are very light,these bearings may be used in an opposed mounting to locatethe shaft. In such cases, shaft endplay should be adjusted attime of assembly.in both directions. Type NP has a double-ribbed inner ring anda single-ribbed outer ring with a loose rib. Both types can carryheavy radial loads and light thrust loads in both directions. Factorsgoverning the thrust capacity are the same as for types NJ andNF bearings.A type NUP or NP bearing may be used in conjunction with typeN or NU bearings for applications where axial shaft expansion isanticipated. In such cases, the N or NU bearing accommodatesthe shaft expansion. The NUP or NP bearing is considered thefixed bearing because the ribs restrict the axial movement ofthe rolling element. The fixed bearing is usually placed nearestthe drive end of the shaft to minimize alignment variations in thedrive. Shaft endplay, or float, is determined by the axial clearancein the fixed bearing.Types NU, N, NJ, NF, NUP and NP conform to ISO and DINstandards for loose rib rings (thrust collars) and typical industrydiameters over or under roller.The cylindrical roller bearing part numbers are in accordancewith ISO 15. They are composed of four digits, the first two digitsidentify the dimensional series and the last two digits of the partnumber are the bore size divided by 5. In the dimensional series,the first digit is the width series and the second is the diameter(outer) series. The width series increase width in the sequence8 0 1 2 3 4 5 6 7. The diameter series increase radial section inthe sequence 7 8 9 0 1 2 3 4.Types having an R prefix are similar in construction to their Ncounterparts. However, they were designed to conform to ABMAstandards.Inch-size bearings are identified by the letter I in the part number.RIU, for example, indicates an inch bearing while RU indicatesthe equivalent style in metric dimensions.Type NUP has double-ribbed outer and single-ribbed inner ringwith a loose rib that allows the bearing to provide axial locationNU, RIU, RUN, RIN, RNFig. 1. Radial cylindrical roller bearings.10TIMKEN CYLINDRICAL ROLLER BEARING CATALOGNJ, RIJ, RJNF, RIF, RFNUP, RIT, RTNP, RIP, RP

EngineeringBearing types and cagesEMA SeriesThe Timken single-row EMA series cylindrical roller bearingsincorporate a unique cage design, proprietary internal geometryand special surface textures. These features help to improvebearing performance and can help to improve uptime and reducemaintenance costs.The cage is a one-piece brass design with full-milled pockets.It is a land-riding cage which, unlike traditional roller-ridingcages, minimizes drag on the roller elements. This reduces heatgeneration and improves bearing life. The high cage rigidityallows for more rollers than possible with other brass cageconfigurations.Proprietary profiles on the rings and/or rollers increase the abilityto handle heavier loads than competing designs.Engineered processes for rings and rollers provide enhancedsurface textures, resulting in lower friction, lower operatingtemperatures and longer bearing life.EMA series bearings are available in types N, NU, NJ and NUP.surface finished to 15 RMS maximum. The W designation in thesuffix indicates the outer ring is provided. The inner ring also canbe furnished separately. The A prefix indicates that the inner ringis furnished either separately or as part of the assembly.The bearing is usually provided with a rugged stamped-steel cage(S designation) and is land-riding on the outer ring ribs. The cagefeatures depressed bars, which not only space rollers evenly, butretain them as a complete assembly with the outer ring. Cagesof machined brass (M designation) are available for applicationswhere reversing loads or high speeds might indicate their need.Outer rings are made from bearing quality alloy steel. The innerrings are deep-case hardened to accommodate the hoop stressesresulting from heavy press fits.The standard bearing is produced with radial internal clearancesdesignated as R6. Other internal clearances can be supplied uponrequest. Proper roller guidance is assured by integral ribs androller end clearance control.TWO-ROW BEARINGSThe full-complement (NCF) single-row bearings include integralflanges on the inner and outer rings. These bearings also canmanage axial loads in one direction and permit small axialdisplacements.Two-row, or double-row, cylindrical bearings offer added radialcapacity over tradition one-row types. These bearing types areinterchangeable so the dimensions and diameter under the rollers(NNU style) and diameter over the rollers (NN style) are held to anISO/DIN standard. The standard cage design is a drilled pocket,finger-style retainer.5200 Metric SeriesFOUR-ROW BEARINGSFull-Complement (NCF)This series features enhanced radial load ratings due to itsinternal design proportions. In this series, the outer ring isdouble-ribbed and the inner ring is full-width with a cylindricalO.D. The bearing also can be furnished without an inner ringfor applications where radial space is limited. When so used,the shaft journal must be hardened to HRC 58 minimum, and theA-52xx-WS52xx-WSFour-row cylindrical bearings have an extremely high radial loadcapacity, but no thrust capacity. This bearing type is mostly usedin roll neck and work roll applications in the metal rolling industry.Straight and tapered bore designs are available.A-52xx-WMA-52xxFig. 2. 5200 metric series bearings.TIMKEN CYLINDRICAL ROLLER BEARING CATALOG11

ENGINEERINGBearing typesTypes and cagesCylindrical Roller Bearing CagesStamped-Steel CagesPin-Type CagesStamped-steel cages for cylindrical roller bearings consist oflow-carbon steel and are manufactured using a series of cutting,forming, and punching operations. These cages are made in avariety of different designs and are suitable for most generalpurpose cylindrical roller bearing applications. One specific typeis the S-type design for the 5200 series cylindrical roller bearing,which is a land-riding cage piloted on the outer ring ribs. Thisdesign has depressed cage bridges which evenly space therolling elements and retain them on the outer ring. Stampedsteel cages are easily mass produced and can be used in hightemperature and harsh-lubricant environments.Pin-type cages for cylindrical roller bearings consist of two ringsand a series of pins running through the center of the rollingelements. These cages are used for large diameter cylindricalroller bearings where machined brass cages are not available.With this design, additional rollers can typically be added,resulting in increased load capacity.Fig. 7. Pin-type cage.Fig. 3. S-type cage.Machined CagesMachined cages are an option for smaller cylindrical bearingsizes, and are typically made from brass. Machined cage designsfor cylindrical roller bearings offer increased strength for moredemanding applications.Designs can be one-piece or two-piece cages. One-piece designscan be either a finger-type as shown in fig. 4 or a standard cageconfiguration having fully milled pockets. The one-piece fingertype and the two-piece design with cage ring (fig. 5) are morecommon in standard cylindrical roller bearings. They also areroller-guided designs.Fig. 4. One-piecefinger-type cage.The one-piece version with fully milled roller pockets (fig. 6)is our premium cage. This cage is used with our EMA seriesbearings. Unlike traditional roller-riding cages, it is a land-ridingcage which minimizes drag on the roller elements. This reducesheat generation, resulting in improved bearing life. Compared toa two-piece design, this one-piece cage also reduces heat andwear by enhancing lubrication flow.Fig. 5. Two-piecebrass cage.Fig. 6. One-piecepremium cage.12TIMKEN CYLINDRICAL ROLLER BEARING CATALOG

Engineeringmetric system tolerancesMETRIC system TolerancesCylindrical Roller BearingsCylindrical roller bearings are manufactured to a number of specifications with each havingclasses that define tolerances on dimensions such as bore, O.D., width and runout. Metric bearingshave been manufactured to corresponding standard negative tolerances.Boundary dimension tolerances for cylindrical roller bearing usage are listed in the followingtables. These tolerances are provided for use in selecting bearings for general applications inconjunction with the bearing mounting and fitting practices offered in later sections.The following table summarizes the different specifications and classes for cylindrical rollerbearings.Table 2. Bearing Specifications and classesSystemSpecificationMetricTimkenTapered Roller BearingsISO/DINAll Bearing TypesABMAInchBearing TypeStandard Bearing ClassKNPrecision Bearing ClassCBAAAP0P6P5P4P2-Cylindrical, SphericalRBEC 1RBEC 3RBEC 5RBEC 7RBEC 9-Ball BearingsABEC 1ABEC 3ABEC 5ABEC 7ABEC 9-Tapered Roller BearingsKNCBA-TimkenTapered Roller Bearings423000000ABMATapered Roller Bearings423000-TIMKEN CYLINDRICAL ROLLER BEARING CATALOG13

ENGINEERINGBearingsystemmetricTypes andtolerancescagesStandard Timken radial cylindrical roller bearings maintainnormal tolerances according to ISO 492. Tables 3 and 4 list thecritical tolerances for these radial cylindrical roller bearings.For applications where running tolerance is critical, P6 or P5tolerances are recommended.The term deviation is defined as the difference between a singlering dimension and the nominal dimension. For metric tolerances,the nominal dimension is at a 0 mm (0 in.) tolerance. The deviationis the tolerance range for the listed parameter. Variation is definedas the difference between the largest and smallest measurementsof a given parameter for an individual ring.Table 3. cylindrical roller bearing tolerances – inner ring (Metric)(1)Bore Deviation(2)ΔdmpBearing BoreWidth VariationVBSFaceRunoutwith BoreSdRadial RunoutKiaAxialRunoutSiaWidth DeviationInner and OuterRings(2)ΔBs and ΔCsOverIncl.P0P6P5P0P6P5P0P6P5P5P5P0, 0.0003-0.005-0.00020.0200.00080.0200.00080

TIMKEN CYLINDRICAL ROLLER BEARING CATALOG 5 OvERvIEW TIMKEN A ABOUT THIS CATALOG Timken offers an extensive range of bearings and accessories in both imperial and metric sizes. for your convenience, size ranges are indicated in millimeters and inches. contact your Timken sales representative to learn more about our complete