BEARING DESIGNATION SYSTEMS
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As one of the world’s leading manufacturers of rollingbearings, linear technology components and steeringsystems, we can be found on almost every continent – withproduction facilities, sales offices and technology centres –because our customers appreciate short decision-makingchannels, prompt deliveries and local service.EuropeTheAmericasAsiaAfrica2Oceania
Partnership based on trust –and trust based on qualityTotal Quality by NSK: The synergies of our global network ofNSK Technology Centres. Just one example of how we meetour requirements for high quality.NSK is one of the leading companies with along tradition in patent applications formachine parts. In our worldwide researchcentres, we not only concentrate on thedevelopment of new technologies, but alsoon the continual improvement of qualitybased on the integrated technology platformof tribology, material technology, analysisand mechatronics.More about NSK at www.nskeurope.comor call us on 44 (0) 1 636 605 123BEARING DESIGNATION SYSTEMS 3
Contents4
Introduction .6How the order codes for bearings are made up . 81.1.11.21.31.4Basic designations .10Basic designations at a glance . 11Code for the bearing bore .12Letters and their different meanings .14Use of codes on bearings and packaging.152.Prefixes . 3.11.2Suffixes .20Internal design . 20External dimensions, external design and materials . 22Seal and circular groove . 24Cage type . 26Bearing design and cage type for spherical roller bearings . 27Matched bearings . 28Internal clearance. 30Internal clearance for deep-groove ball bearings . 32Noise-tested bearings. 33Dimensional, geometrical and running accuracy . 34Heat treatment . 35Lubricants . 36Common bearing greases. 36Amount of grease .374.Suffixes: Comparsion of codes .38BEARING DESIGNATION SYSTEMS 5
Introduction6
Order codes for bearings are made up of acombination of letters and numbers. Thisalphanumeric combination denotes the type,size and structure of the bearing.Within each order code, a distinction is madebetween the basic designation and anysuffixes and/or prefixes. The basic designationindicates the bearing type and the bore size.These basic designations are defined in theGerman DIN 623 standard and the relevantISO standard. For most bearing types, thebasic designation is made up of numbers,but some are alphanumeric. Prefixes andsuffixes denote special modifications, forexample if the internal clearance or accuracydeviate from the norm. The use of prefixesand suffixes is only partially standardised.Suffixes differ the most, with the variousbearing manufacturers using different codesfor certain modifications. This brochure servesto explain the various bearing codes used byNSK and RHP and helps you to compare themwith other manufacturers’ designations.NSK is one of the world’s largest bearingmanufacturers. In the early 1990s, it tookover the RHP Group, UK‘s biggest producerof bearings. Since then, NSK has beendistributing bearings using the NSK andRHP brand names. In some cases, the twobrands’ bearings use different supplementarydesignations. If no supplementary designationis listed under the NSK or RHP brand name,it means that there is no equivalent to theother brand’s designation.This brochure also uses . or . in somedesignations. This indicates that the dot(s) canbe replaced with different numbers or letters.Table 4 (page 38) compares NSK’s and RHP’ssupplementary designations with the codesused by a number of competitors. This tablewas prepared carefully based on the materialavailable to us from the relevant competitors.However, we cannot guarantee that theinformation is correct.BEARING DESIGNATION SYSTEMS 7
IntroductionHow the order codes for bearings are made upThe diagram below shows how the order codes are made up. There shouldbe spaces separating the individual sections of an order code from oneanother.Basic designationPrefixCode for the bearing seriesCode for the bearing boreSuffixExamples:8HR31309JF608MC3
Designation of tapered roller bearings as per ISO 355ExampleT2CD025Letter designatinga tapered roller bearingCode for contact angleLetter designating the ratio between theoutside diameter and the boreLetter designating the ratio between thewidth and the section heightBore size in mmBEARING DESIGNATION SYSTEMS 9
1 Basic designations10
The basic designation consists of the code for the bearing series and the code for thebearing bore. The most important codes for metric bearing series are listed in table 1.1.Table 1.1 – Basic designations at a glanceMetric bearing seriesBasic designationDeep-groove ball bearing42, 43, 60, 62, 63, 64, 68, 69, 160, 161Angular-contact ball bearing32, 33, 52, 53, 70, 72, 73, 78, 79Self-aligning ball bearing12, 13, 22, 23, 112, 113, 115Separable ball bearingBO, E, LCylindrical roller bearingN2, N3, N4, N22, N23NJ2NJ3, NJ4, NJ22, NJ23NU2NU3, NU4, NU22, NU23NUP2NUP3, NUP4, NUP22, NUP23NF2NF3, NF4NNNN30, NNU49Tapered roller bearing302, 303, 313, 320, 322, 323, 329, 330, 331, 332Spherical roller bearing213, 222, 223, 230, 231, 232, 239, 240, 241Thrust ball bearing511, 512, 513, 514, 522, 523, 524Spherical roller thrust bearing292, 293, 294RHP still produces deep-groove ball bearings, separable ball bearings, angular-contact ballbearings, four-point contact bearings, thrust ball bearings, cylindrical roller bearings andself-aligning bearings in imperial dimensions (inches). Please refer to our catalogue forthese bearing series’ codes.BEARING DESIGNATION SYSTEMS 11
1 Basic designations1.2 Code for the bearing boreThe code for the bearing bore indicatesthe bearing’s bore size. A two-digitnumber is used for bore sizes from 20mm to 480 mm. This number is multiplied by five to give the bore size.For example, the code 6224 stands fora deep-groove ball bearing with a boresize of 120 mm. Diameters of 10, 12, 15and 17 mm are an exception.In these cases, 00 indicates a diameterof 10 mm, 01 stands for 12 mm, 02means 15 mm and the code 03 corresponds to a diameter of 17 mm.12The diameter is stated in mm for boresizes up to 9 mm and over 480 mm.However, a deep-groove ball bearingwith the code 688 MC3 has a bore sizeof 8 mm and a spherical roller bearingdesignated as 230/560 CAM E4 has abore size of 560 mm.The bore size is separated from thebearing series code using a slash in thecase of bearings with bore sizes thatcannot be divided by five, e.g. 63/22.
BEARING DESIGNATION SYSTEMS 13
1 Basic designations1.3 Letters and their different meaningsPrefixes and suffixes can have different meanings dependingon the bearing series in question.Examples:HR 33206 J Contact angle as per ISO6204 ZZ C3E AS2S 5 J Individually wrapped and boxed6304 C3 E Low noise bearingNJ 204 E T Extra capacity cylindrical roller bearingR NU 207 Cylindrical roller bearing with no inner ringR 4 ZZ Miniature bearing with imperial dimensions14
1.4 Use of codes on bearings andpackagingThe full bearing code – including allprefixes and suffixes – always appearson the packaging. The bearing ringsthemselves usually only featurethe basic designation and somesupplementary designations, suchas radial clearance and accuracy.Information about the cage is notnormally provided on the rings.In most cases, the basic designationis stamped or lasered onto NSK andRHP bearings, while the supplementarydesignation is added using a laser etch.As well as the bearing code, the ringsare marked with the NSK or RHPcompany name, the country ofmanufacture and internal productioncodes. However, these are not placedimmediately next to the type code.Should a replacement bearing beneeded, users have to check thebearing which has been removedto see what type of cage is required.The lubricant used in sealed deepgroove ball bearings, for example,cannot be indicated on the bearingitself due to the large number ofdifferent options available.BEARING DESIGNATION SYSTEMS 15
2 Prefixes16
Prefixes are used comparatively rarely. They serve almost exclusively to indicate individualcomponents of complete bearings or to designate miniature bearings. The codes are listedin table 2.Table 2 – Prefixes at a glanceNSKRHPBDefinitionBearing with special dimensions, example: B 15BFHousing insert with no eccentric ring, example: B1030-30DECBearing with flanged outer ring, example: F 684 ZZ MC3 NS7LHRFor tapered roller bearings and deep-groove ball bearings: higher load rating, example: HR 32210 JJLubrication hole on the same side as the mounting screws or eccentric collar lock, example:J1020-20GMFMiniature metric bearing with special dimensions and flanged outer ringMRMiniature metric bearing with special dimensionsExample: MR 126 ZZ MC3 PS2SBearing outer ring with rollers and cage, no inner ringExample: R NU 207RRRFor NU 207 cylindrical roller bearing: outer ring with roller crown and cageInstead of the prefix R, the following designation can also be used at NSK:(example) RUS . . . instead of RNU . . .Miniature imperial bearing, example: R 4 Z MC3Miniature bearing made from extra corrosion-resistant steelExample: 608 -H- 20 T1X ZZ NS7 S-H-TMounted unit insert with triple lip sealExample: T1025-25GBEARING DESIGNATION SYSTEMS 17
3 Suffixes18
A large number of suffixes are used to denote structural modifications. Specifically, thesuffixes provide information about the:› Gage››››››TypeInternal designSealLubricant usedTolerancesInternal clearanceExternal designThe suffixes are listed in table 3 (page 20). Table 4 (page 38) compares NSK’s and RHP’smost important suffixes with those used by two of their competitors.BEARING DESIGNATION SYSTEMS 19
3 SuffixesTable 3.1 – Internal designDefinitionABThese codes do not have set meanings when they are used directly after the basic designation.They are used when necessary to denote modifications to the bearing’s internal design. Normally,they are only used for a limited amount of time to prevent confusion during atransitional period.CDEFHowever, in some cases they are used permanently to designate bearings of thesame type and dimensions which have different internal designs.NSKRHPAAAngular-contact ball bearing with 30 contact angleExample: 7014 A TR SUL P3A5EAngular-contact ball bearing with 25 contact angleExample: 7014 A5 TR SUL P3BBAngular-contact ball bearing with 40 contact angleExample: 7310 B EAT85 SU CNBCCAngular-contact ball bearing with 15 contact angleExample: 7910 C T SUL P4EACAM20DefinitionSpherical roller bearing with higher load rating and pressed steel cageExample: 22224EAE4Spherical roller bearing with floating guide ring and one-piece solid brass cageExample: 23156 CAM E4
NSKRHPDefinitionSpherical roller bearing with floating guide ring and pressed steel cageExample: 23020 CD E4C/CDEEExtra capacity designExample: NU 2212 E T C3EAEJSpherical roller bearing with extra capacity design and pressed steel cageExample: 22312 EJFSMounted unit insert with flinger sealExample: 1035-35DECGFSTapered roller bearing with contact angle as per ISOExample: HR 32215 JJU22Spherical roller bearing with superior-quality surface finish on the raceways and rolling elementsU32Cylindrical roller bearing with NJ and NUP design and modified shoulder designU34Cylindrical roller bearing for vibrational stressVSVBSpherical roller bearing for vibrating screens, internal clearance C3Example: 22317 CAM-VS3BEARING DESIGNATION SYSTEMS 21
3 SuffixesTable 3.2 – External dimensions, external design and materialsNSKRHPDefinitionE2W33For double-row cylindrical roller bearings: oil groove and lubrication holes in the outer ring(dependent on bearing size: E, E1, E2, E3, E4)Example: NN 3017 MB KR E2 CC1 P4 (This has now been replaced by E44 only)E4W33For spherical roller bearings: oil groove and lubrication holes in the outer ringExample: 22230 CAM E4Bearing made from case-hardening steel. If no digits are added, the rings and the set of rollingelements are made from case-hardening steel. Additional numbers indicate which parts:gg2 Outer ring onlyg3 Inner ring onlyg4 Set of rolling elements onlyg5 Outer and inner ringg6 Outer ring and set of rolling elementsg7 Inner ring and set of rolling elementsExample: 22215CAGM(computer-generated documents use a capital G)-H -(h)22Bearing made from corrosion-resistant steelExample: 625-H-T12ZZ1MC3
NSKRHPDefinitionK30K30Bearing with tapered bore, taper 1:30Example: 24030 CAM K30 E4Bearing with tapered bore but with narrower tolerance range positioned towards lower limitof ISO range (mainly for precision bearings)KRSSurface protection, phosphatisedExample: RS-5012D5E7NA S5 C3UThrust ball bearing with spherical housing washer and seat washerExample: 53210 UXBearing whose external dimensions have been changed to comply with international standardsExample: 51226 X/./.For bearings with a bore size that cannot be divided by five or is larger than 480 mm: bore sizeExample: 63/22 or 230/560BEARING DESIGNATION SYSTEMS 23
3 SuffixesTable 3.3 – Seal and snap ring grooveThe following suffixes are only used in conjunction with ball bearings.NSKRHPDefinitionDRSRBearing with seal on one side(only for bores 10 mm on NSK bearings and bores 20 mm on RHP bearings)Example: 608 D MC3 NS7LDD-2RSRBearing with seal on both sides(only for bores 10 mm on NSK bearings and bores 20 mm on RHP bearings)Example: 608 DD MC3 PS2SDDU-2RSBearing with seal on both sides, example: 6208 DDU CM AS2SDURSDUNRSNBearing with seal on one side and snap ring groove on the opposite sideExample: 6207 DUNDUNRRSNRBearing with seal on one side and snap ring groove with snap ring on the opposite side, example:6310 DUNR C3 AV2SNNNRBearing with shield on one side and snap ring groove with snap ring on the same side, example:6208 NRZNRZ24Bearing with snap ring groove in the outer ring and snap ringExample: 6208 NRBearing with seal on one side and snap ring groove with snap ring on the same sideExample: 6205 NRDUNRDUNZBearing with snap ring groove in the outer ring, example: 6208 NBearing with seal on one side and snap ring groove on the same sideExample: 6204 NDUNDUNRBearing with seal on one side, example: 6208 DU C3ERSZNZNBBearing with shield on one side and snap ring groove on the same sideExample: 6208 NZ
NSKRHPDefinitionFor double-row angular-contact ball bearings: bearing with contact seal and no groove in the innerringExample: 3302 B-RSR TNGRSRVBearing with non-contact seals on one side, example: 6208 VVVBearing with non-contact seals on both sides, example: 6208 VV CM NS7SZZZNZNBearing with shield on one side and snap ring groove on the opposite sideExample: 6206 ZNZNRZNRBearing with shield on one side and snap ring groove with snap ring on the opposite side,example: 6202 ZNRZRZRZSZZBearing with shield on one side, example: 6208 ZFor double-row angular-contact ball bearings: bearing with shield and no groove in the inner ringExample: 3205 B ZR TNGBearing with removable shield on one side, example: 6326 ZS-2ZBearing with shields on both sides, example: 6208 ZZ C3E BQHSZZSBearing with removable shields on both sidesExample: 6326ZZS C3 AS2S2RSSelf-aligning ball bearing with contact seals on both sides (only for bearings in the 22. and 23.series), example: 2208-2RS TNG AR3N2RSRBearing with contact seals on both sides in the case of double-row angular-contact ball bearingswith no groove in the inner ring, example: 3207B-2RSR TNG YRLNBearing with shields on both sides in the case of double-row angular-contact ball bearings with nogroove in the inner ringExample: 3211 B-2ZR TNG AR3N2ZRThe codes for seals may also include numbers for special materials; 8 acrylateExample: 6205 DDU8 C3E ENSSCombinations of Z, V and DU may also be usedExample: 6006 VDUBEARING DESIGNATION SYSTEMS 25
3 SuffixesTable 3.4 – Cage typeThe supplementary designation for the cage type is usually added on the end of the basicdesignation if the bearing does not feature the cage used as standard for the respectivekind of bearing.NSKRHPJMMAPressed steel cageExample: 2206 EJ W33Solid brass cage guided by the outer ringExample: 6318 MSolid brass window-type cageExample: NJ 326 MA1MA1MBSolid brass cage guided by the inner ringExample: 22319 MB W33 11Solid brass cage guided by the rolling elements, rivetedExample: NJ 312 MBRMBRMRSolid brass cage guided by the rolling elementsExample: NU 232 MRT.Polymer cage, standard material. Polyamide 66 polymeric cage reinforced with glass fibre designsand materials designated by numbers and letters. Example: NU 208E T; 6001 T1XTInner ring guided laminated phenolic resin cage for precision deep groove ball bearing.Example 6205 TT1XInner ring guided laminated phenolic resin cage for precison deep groove ball bearing.Example 6205 T1XTROuter ring guided laminated phenolic resin cage for precision angular contact bearings.Example 80BNR 10 ST SULP4 Precision Robust series.Example 7013 C TR DBLP4 Precision Standard seriesTRT8526DefinitionTRLaminated phenolic resin for spindle bearingsExample: 7910 A5 T SUL P4Polyamide 46 cage reinforced with glass fibreExample: 7208B EA T85 SU CNB
NSKRHPTNGTNDefinitionSnap cage made from glass fibre reinforced polyamide 66Example: 2204 E TNGPolymer cage made from polyamide 66 glass fibre reinforcement for spindle bearings.This generally superseded by TYNTYPolymer cage made from polyamide 4.6 with glass fibre reinforcement for spindle bearingsExample: 7010 C TYN SUL P3TYNVVFull complement ball bearing, or roller bearingExample: NCF 3022 VWJFor cylindrical roller bearings and angular-contact ball bearings: pressed steel cageExample: NU204 W, 7206B W GYYPressed brass cageExample: 6006 YTable 3.4.1 – bearing design and cage type for spherical roller bearingsNSKRHPDefinitionC/CDFloating guide ring, pressed steel cageCAMFloating guide ring, solid brass cageEJEVBExtra capacity design with pressed steel cageExtra capacity design with solid brass cageBEARING DESIGNATION SYSTEMS 27
3 SuffixesTable 3.5 – Matched bearingsA letter (L, M or H) is added to the codes marked with * to indicate the preload class.The same principle applies to SUL, SUM and SUH. For details of the special characters forinternal clearance and preload, refer to 3.6 ‘Internal ontact ball bearing with 40 contact angle for installation as a pairin a face-to-face, back-to-back or tandem configuration. Axial clearance in thecase of face-to-face or back-to-back arrangements (W: see 3.4 ‘Cage type’),example: 7210 BG, 7206 BWGDB*DB*Pair of bearings in a back-to-back configuration, example: 7210C TYN DB L P4DBB*QB*Quadruplex set of bearings in a back-to-back configurationExample: 7214 A5 TYN DBBL P4 KL14DBD*2TB*Triplex set of bearings in a combined tandem/back-to-back configurationExample: 7012 A5 DBDM P4 KL12DBT*3TB*Quadruplex set of bearings in a combined tandem/back-to-back configurationExample: 7210 A5 TYN DBTM P4 KLBDF*DF*Pair of bearings in a face-to-face configuration,example: HR 31309 J DF KR CA72DFD*2TF*Triplex set of bearings in a combined tandem/face-to-face configurationExample: 7310 B A5 DFD CA13DFF*QF*Quadruplex set of bearings in a face-to-face configurationExample: 7916 C TYN DFFLP4 KL18DFT*3TFQuadruplex set of bearings in a combined tandem/face-to-face configurationExample: 7014 C TYN DFT LP4 KL12DRDTwo bearings matched for even absorption of radial loads, example: NU 208 EM C3 DRDTDTPair of bearings in a tandem configuration, example: 7210 A TYN DT P2DTD3TTriplex set of bearings in a tandem configuration, example: 7008 C TYN DTD P4DTT4TQuadruplex set of bearings in a tandem configuration,example: 7013 A5 TYN DTT P4Arrangement
NSKRHPDefinitionDUD3USet of spindle bearings consisting of 3 universal bearingsQU4USet of spindle bearings consisting of 4 universal bearingsDUHDUHDULDULDUMDUMSUHSUHSULSULSUMSUM KL(R). KRPair of spindle bearings for installation in any face-to-face, back-to-back or tandemconfiguration. Heavy preload in the case of face-to-face and back-to-back arrangements,example: 7214 CTYN DUH P4Pair of spindle bearings for installation in any face-to-face, back-to-back or tandemconfiguration. Light preload in the case of face-to-face and back-to-back arrangements,example: 7905 A5 TYN DUL P4Pair of spindle bearings for installation in any face-to-face, back-to-back or tandemconfiguration. Medium preload in the case of face-to-face and back-to-back arrangements,example: 7212 A5 TYN DUM P4Universal spindle bearing for multiplex bearing sets with any number of bearings.Heavy preload in the case of face-to-face and back-to-back arrangements,example: 7214 A5 TYN SUH P4Universal spindle bearing for multiplex bearing sets with any number of bearings.Light preload in the case of face-to-face and back-to-back arrangements,example: 7908 A5 TR SUL P4Universal spindle bearing for multiplex bearing sets with any number of bearings.Medium preload in the case of face-to-face and back-to-back arrangements,example: 7004 C TR SUM P4Set of bearings with annular spacers between the outer and inner rings.The subsequent number indicates the width of the rings,example: 7918 A TYN DBD P4 KL10HR31316DB KLR10Set of bearings with annular spacer between the outer ringsExample: HR31309 JDF KR CA90BEARING DESIGNATION SYSTEMS 29
3 SuffixesTable 3.6 – Internal clearanceC0 (or CN) denotes normal internal clearance and is not marked on thebearings themselves or on the packaging.NSKRHPInternal clearance less than C2Example: NNU 4924 MB KR E44 CC1 P4C1C2C2Internal clearance less than normalExample: 6308 C2C3C3Internal clearance greater than normalExample: 22212 CAM C3C4C4Internal clearance greater than C3Example: 22232 CAM C4C5C5Internal clearance greater than C4Example: NU 2228 EM C5CA.A.Special axial clearance; the figures indicate the mean value of the clearance class in μmExample: HR 31307J DF KR CA73CC.CE30DefinitionRadial clearance for cylindrical roller bearings with non-interchangeable bearing components.The subsequent number indicates the clearance class (no number for normal clearance),example: NU 210E T7 CC3Radial clearance in the middle of the ‘normal’ class, low noise Example: 6007 CE
NSKRHPDefinitionCG.R.Special radial clearance; the figures indicate the mean value of the clearance class in μmExample: 6203 T1X DDU CG14ERadial clearance for deep-groove ball bearings with reduced radial clearance range withinthe ‘normal’ clearance class, low noiseExample: 6212 CMCMRadial clearance for cylindrical roller bearings with reduced radial clearance range within the‘normal’ clearance class, non interchangeable ringsExample: NU 214 CMCP.CTG.Pair of bearings with special preload; the figures indicate the mean value of the preload inμmExample: 7212 B W DB CP5Radial clearance for cylindrical roller bearings with reduced radial clearance range within the‘normal’ clearance class, low noise, interchangeable rings, example: NU 208 ET7 CTBEARING DESIGNATION SYSTEMS 31
3 SuffixesTable 3.7 – Internal clearance for deep-groove ball bearings with abore size of less than 10 mm (miniature bearings)NSKRHPDefinitionMC1Radial clearance less than MC2Example: 624 MC1MC2Radial clearance less than MC3Example: 623 MC2MC3Radial clearance corresponds to a reduced normal clearance tolerance as per ISO5753Example: 686 MC3MC4Radial clearance greater than MC3Example: 625 DD MC4 E PS2S 6MC5Radial clearance greater than MC4Example: 606 ZZ MC5 E NS7LKMC6Radial clearance greater than MC5Example: 626 T1X DD MC6 E NS7S JContrary to the radial clearance stipulations of ISO 5753 (see 4 ‘Suffixes: a comparisonbetween NSK/RHP and two competitors’ codes’), NSK produces deep-groove ball bearingswith a bore size of less than 10 mm to smaller tolerance ranges than those defined in theabove-mentioned standard. MC3 radial clearance corresponds to reduced normal clearanceas per ISO 5753. The radial clearance class of NSK miniature bearings is always indicated.32
Table 3.8 – Noise-tested bearingsNSKRHPDefinitionCMLow noise specification for deep-groove ball bearings and cylindrical roller bearings includingreduced radial clearance tolerance; non-interchangeable rings in the case of cylindrical rollerbearingsExample: 6214 CMCTLow noise specification for cylindrical roller bearings including reduced radial clearancetolerance; interchangeable ringsExample: NU 312 E T CTELow noise bearing (used straight after the radial clearance code)Example: 6303 C3 E, 608 MC2 EERLow noise bearing; tougher requirements than E, CM and CTExample: 625 ZZ1 CM3 ER P5 PS2LEFLow noise bearing; even tougher requirements than ERExample: 624 ZZ1 MC3 EF P4 NS7LBEARING DESIGNATION SYSTEMS 33
3 SuffixesTable 3.9 – Dimensional, geometrical and running accuracyNormal tolerance (P0) is not marked on the bearing or on the packaging.34NSKRHPDefinitionP2P2P2 tolerance class as per ISO 492Example: 7002 C TR SUL P2P2A0P2A Special tolerance for Precision Angular contact thrust bearings - P2 tolerance exceptoutside diameterP3External tolerance as per P4 tolerance class, running accuracy as per P2 tolerance classExample: 7000 C TR SUL P3P4P4P4 tolerance class as per ISO 492Example: 7209 A5 TR SUL P4P4AP4AP5P5P5 tolerance class as per ISO 492Example: 7206 B P5P6P6P6 tolerance class as per ISO 492Example: 6205 P6PA5P5Tolerance class as per ABEC 5Example: 7010 C TR DBL PA5PA7P4Tolerance class as per ABEC 7Example: 7213 A5 TR PA7PA9P2Tolerance class as per ABEC 9Example: 7211 C TR PA9PN7AP4Accuracy class as per NSK factory standardExample: 30TAC62BDBC10PN7A AS2S 5PN7BPN7BP4A Special tolerance for Precision Angular contact thrust bearings - P4 toleranceexpect outside diameter. Both used in combination with CRB's SU also have speed widthdimensionsPN7B Special accuracy, bore and outside diameter exclusive to NSK forSU arrangements only
Table 3.10 – Heat treatmentNormal heat stabilisation for operating temperatures of up to 120 C isnot marked on the bearing or the packaging.NSKRHPDefinitionS11S1Thermally stabilised for operating temperatures up to 200 COnly used for spherical roller bearingsExample: 23036 CAM E4 C3 S11X26S0Thermally stabilised for operating temperatures up to 150 CExample: 6304 C4 X26X28S1Thermally stabilised for operating temperatures up to 200 CExample: NU 210 C3 X28X29S2Thermally stabilised for operating temperatures up to 250 CExample: NU 2236 M C4 X29BEARING DESIGNATION SYSTEMS 35
3 SuffixesTable 3.11 – LubricantsDeep-groove ball bearings with seals or shields on both sides are supplied with a greasecharge. The type and amount of grease varies depending on the operating conditions andbearing series.Table 3.11.1 – Common bearing greasesNSK code36Lubricant nameA22SHELL Aeroshell 22A72KLÜBER Asonic GHY72AS2SHELL Alvania S2ASMKLÜBER Asonic GLY32BQHKLÜBER Klueberquiet BQH72-102D8SKLÜBER Isoflex Super LS18EA3NSK Grease EA3EA5NSK Grease EA5EA6NSK Grease EA6EA7NSK Grease EA7EEMEXXON-MOBIL Polyrex EMENSNSK Grease ENSNS7KYODO YUSHI Multemp SRLNSCNSK Grease NSCPS2KYODO YUSHI Multemp PS2ST3RHENUS Norlith STM3TMLLUBCON Thermoplex 2TMLTN5KLÜBER Isofelx Topas NB52
Table 3.11.2 – Amount of greaseThe details provided here are mean values, which depend on the size and structure of thebearing (open, sealed on one side or sealed on both sides). The amount of grease useddepends on the specific operating conditions. The codes for the type and amount of greaseare written together at the end of the bearing designation.Example: 6203 DDU C3E AS2SNSK codeFilling amount (range in % of the bearing free space)KApprox. 20%LApprox. 20% to 30%SApprox. 30% to 55% (standard NSK filling)MApprox. 55% to 70%FApprox. 85% to 90%BEARING DESIGNATION SYSTEMS 37
4 Suffixes: Comparsion of codesTable 4NSKRHPExampleSKF*AAAngular-contact ball bearing with contact angle of 30 7014 AAAMounted unit insert fitted with set screw lock insert withflush inner ring on one sideSL 40 AFAG*A5EAngular-contact ball bearing with contact angle of 25 7208 A5ACDEBBAngular-contact ball bearing with contact angle of 40 7210 BBBBBearing with special dimensionsBBDoubl
Prefix Code for the bearing series Code for the bearing bore Suffix Examples: Basic designation. BEARING DESIGNATION SYSTEMS 9 Letter designating a tapered roller bearing Code for contact angle Letter designating the ratio between the outside diameter and the bore
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contents 1. bearing failure analysis 3 1.1 determination of operating data 3 1.2 lubricant sampling 4 1.3 inspection of the bearing environment 4 1.4 assessment of bearing in mounted condition 5 1.5 dismounting the damaged bearing 5 1.6 assessment of the complete bearing 5 1.7 assessment of bearing components
SXV and SXR Ball Bearing Take-Up Bearing from 3/4” through 2-7/16” shaft size. DL Ball Bearing Take-Up Bearing from 3/4” through 1-7/16” shaft size. LT700 and LT1000 SOLlDLUBE Take-Up Bearing from 3/4” through 2-1/2” shaft size. Six sizes of Wide Slot Ball Bearing
4 TIMKEN METRIC TAPERED ROLLER BEARINGS BEARING DATA TIMKEN METRIC TAPERED ROLLER BEARINGS Bore Part Number Dimension Series (ISO 355) Bearing Dimensions Bore d O.D. D Width T B Width C mm mm mm mm mm mm 15 30302 2FB 15.000 42.000 14.250 13.000 11.000 17 30203 2DB 17.000 40.000 13.250 12.000 11.000 30303 2FB 17.000 47.000 15.250 14.000 12.000 20 File Size: 279KBPage Count: 20Explore furtherTapered Roller Bearing Catalog Timkenwww.timken.comTimken Tapered Roller Bearing Catalog - TIMKEN - PDF .pdf.directindustry.comTimken Metric Tapered Roller Bearing Catalogwww.timken.comTIMKEN METRIC TAPERED ROLLER BEARINGSwww.timken.comTimken-Tapered Roller Bearing Catalogue - THE TIMKEN .pdf.aeroexpo.onlineRecommended to you b
outstanding thrust bearing performance of gear-bearing helical/herringbone teeth suggests major roll in bearing applications. gear-bearing anti-friction rotary shafts. gear-bearing high load wheel bearings. gear-bearing approach seems general enough to work well in linear slides and motion conversion devices.
True bearing is the angle measured relative to the true north line (see Figure 4). The starting point to determine true bearing is the nortsouth line. North will then always be 0º. True bearing is always measured clockwise from north at 0º. FFFFIIGGUURREE IGURE 444 True bearing, magnetic bearing and magnetic declination 2.2.2 Magnetic bearing
the timken company catalog 699 bearing dimension catalog explanation of timken bearing symbols bearing dimensions by part number bearing dimensions by core bore not to be used as a design manual 25 (u.s. dollars) proudly manufactured in timken company plants throughout the world timken-hong kong eric bearing co.,ltd, web site .
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