BEARING

1 THE TIMKEN COMPANYC atalog 699 BEARINGDIMENSIONCATALOG EXPLANATION OF TIMKEN BEARING SYMBOLS BEARING DIMENSIONS BY PART NUMBER BEARING DIMENSIONS BY CORE BORENOT TO BE USED AS A DESIGN MANUAL$25 ( Dollars)PROUDLY MANUFACTUREDIN TIMKEN COMPANYPLANTS THROUGHOUT THE WORLDTIMKEN-Hong Kong Eric BEARING Co.,Ltd, Web Site: 699 TIMKEN-Hong Kong Eric BEARING Co.,Ltd, Web Site: is the registered trademark of The Timken 1999 The Timken CorporationPrinted in Order No. 7011 WORLDWIDE LEADER IN BEARINGS AND STEEL$25 ( Dollars) of The Timken Company through the power of the web.

2 Look to for the latest updates to Timken dimensional informationTIMKEN-Hong Kong Eric BEARING Co.,Ltd, Web Site: OFTIMKEN BEARING THRU 935 THRU 9900 THRU LM29700 THRU99000 THRU HH249900 THRU 299000 THRU 690000 THRU LL989300 SERIES10. IsoClass 11. BEARING TYPESUNIT-BEARINGTMDUO-FACE PLUS SEALSTEERING gear CROSSED ROLLERTHRUSTHYDRA-RIBTMUNIPACTM12. K PARTS13. NP & XC PARTS14. AUXILIARY PARTS15. CONE BORE SECTIONINCLUDES: EXPLANATION OF TIMKEN BEARING SYMBOLS BEARING DIMENSIONS BY PART NUMBER BEARING DIMENSIONS BY CORE BOREBEARING COMPONENTS ARE SHOWN IN BOTH METRIC AND INCH each part number the top line is millimeters, bottom line is COMPONENT WEIGHTS ARE SHOWN IN BOTH METRIC AND POUND each part number the top line is kilograms.

3 Bottom line is TO BE USED AS A DESIGN MANUALThis is not a manual for the selection of bearings for new it is necessary to select Timken bearings for new applicationsconsult the BEARING Selection Handbook or get in touch with the nearestoffice of The Timken effort has been made to ensure that the data listed in this catalog is , we cannot assume responsibility for possible error. COPYRIGHT 1999 BY THE TIMKEN COMPANYBEARINGDIMENSIONCATALOGWORLDWIDE LEADER IN BEARINGS AND STEELTIMKEN-Hong Kong Eric BEARING Co.,Ltd, Web Site: !

4 Failure to observe the following warnings could lead to a risk of serious bodily harm: Never spin a BEARING with compressed air. The rollers may be forcefully expelled. If a hammer and bar are used for BEARING removal, fragments from the hammer, bar, or the bearingcan be released with high : A mild steel bar is preferred since it is less susceptible to fragmenting. When installing or removing bearings, always wear safety glasses or to observe the following instructions can result in equipment failure leading to a riskof serious bodily harm: Proper maintenance and handling practices are critical.

5 Follow installation instructions and maintainproper lubrication. Do not attempt to disassemble unitized bearings. Components may be damaged. Do not use a damaged BEARING . Do not mix parts of matched assemblies. BEARING damage could BEARING performance is affected by many factors beyond the control of The Timken , the feasibility of all BEARING applications should be validated by the customer. The datacontained in this guide is intended for reference purposes and will assist you in part number andexternal BEARING dimension Kong Eric BEARING Co.

6 ,Ltd, Web Site: ROLLING BEARING BASIC DESIGNC onsidering the performance demands placed on taperedroller bearings, it s rather amazing how simple the basicdesign really is. Timken tapered roller bearings minimizefriction because of the interrelationship of the BEARING sfour basic parts: The inner ring, or cone, is mounted onto the shaft. The outer ring, or cup, sits in the housing (hub). The tapered rollers, or rolling elements, allow relativemotion between the cone and cup thus minimizing fric-tion between the two. The cage, or separator, spaces and holds the rolling ele-ments in the proper position.

7 The races are the surfaces on the cup and cone wherethe rolling elements make tapered roller BEARING s most important dimensionsare: The outside diameter of the outer ring, or cup, is knownas the (D). The other basic dimension of this part isthe cup width (C). Both are important for fitting thebearing onto the housing. The inside diameter of the inner ring, or cone is calledthe bore (d). This diameter must be correct in order tofit the BEARING onto the shaft. The other basic dimensionof this part is the cone width (B). When cup and cone are mated (including rollers andcage), the overall dimension is called the overall bear-ing width (T).

8 BEARING components or assemblies must be in fit onto a shaft or within a housing must be squareor in alignment by checking: The maximum shaft radius (R), which allows the conebackface to make contact with the shoulder of theshaft. The maximum housing radius (r), which allows the cupbackface to make contact with the shoulder of RING(CONE)CONEASSEMBLYROLLING ELEMENTS(TAPERED ROLLERS)OUTER RING(CUP)CAGETIMKEN-Hong Kong Eric BEARING Co.,Ltd, Web Site: ROLLER BEARINGS SPACER ASSEMBLIESS pacer BEARING AssembliesSpacer BEARING assemblies speed up BEARING installationtime because there is no need for BEARING BEARING assemblies are suitable for use with two-row and four-row Timken tapered roller bearingsto preset the bench lateral (bench end play).

9 Mostmatched BEARING assemblies have serial numbers toensure correct installation spacer bearings are precisely ground to providethe exact bench lateral required for the particularbearing each spacer is custom-fitted to a particular set ofcomponents, a spacer cannot be used with any otherbearing components even if they carry the same ordering replacement BEARING assemblies,specify: cone number assembly you do not have the assembly number, specify thecomponent part numbers including: cone number cup number spacer number bench end play, which is etched on the you do not have any part numbers for the spacerassembly, specify: Name of equipment Model number Year Application position of the : Always follow manufacturer sinstructions.

10 Failure to follow all instructions and toproperly lubricate the BEARING can cause equipmentfailure, creating a risk of serious bodily or under-filling a wheel hub withlubricant may result in premature component a risk of serious bodily spin a BEARING with compressed air. Therollers may be forcefully expelled, creating a risk ofserious bodily NOT MIX Double Outer (TDO)This diagram depicts the way spacers are used betweenthe cone front faces in the TDO BEARING . The spacer fitsbetween the two single Double Inner (TDI)Here is an example of how spacers are used betweenthe cup front faces in the type TDI BEARING .