Cage & Needle Roller Assemblies - bearing

1 NSK cage and Needle Roller Assemblies are high-qualityproducts that offer users higher reliability and greater easeof handling and & Needle RollerAssemblies2 cage & Needle Roller Assemblies1 Adaptable to severe operatingconditions, including strong impactload, complex operations, and Easy handlingUnitized design facilitates easy handling High load capacityLow cross-section provides high load capacitywithin the smallest High limiting speedProperly lubricated, the cage structure guides therollers precisely enabling high-speed Long lifeRoller crowning reduces stress on the Roller ends andprolongs bearing & Needle Roller Assemblies3 cage & Needle Roller AssembliesNSK cage and Roller Assemblies consist of a complement of Needle rollers held in place by a cage . Their unitized designmakes for easy handling and installation. With no inner or outer ring, the low cross-section provides maximum load-carrying capability within the smallest envelope.

2 Properly lubricated, they can operate at high speeds thanks to the uniquecage, which guides the rollers precisely. The controlled contour rollers in cage and Roller Assemblies have an optimumprofile, which reduces end stress, allows operation under moderate misalignment and prolongs bearing Design and TypesThe most common cage used in cage and rollerassemblies is the M type. M-type cages are either pressedfrom steel plate or cages undergo surface hardening after processingto attain high wear-resistance and rigidity. The cagesfacilitate optimum lubricating conditions because lubricantcan be easily cages include those made by precision pressing,welded cages, and polyamide molded cages produced by welding pressed steel areespecially suited for mass production. Applying itsconsiderable experience and knowledge, NSK supplies cage and Roller Assemblies of the highest for the various types of cage and Roller Assemblies areshown in Table 1.

3 There are many types of cage and rollerassemblies other than those in Table 1, including split 1 cage and Roller Assembly Codes2. Specification NumberAn example of a bearing specification number is as follows:Inscribed circle diameter (mm)CodeCircumscribed circle diameter (mm)Width (mm)Example:-FWF202620 For inch bearings, each dimension is expressed with two-digit whole numbers in units of 1/16 of an inch following the Accuracy StandardNSK cage and Roller Assemblies usually use rollers classified as JIS Class 3 or higher. Roller accuracy is shown in Table 5112h1330 : mTable 2 Accuracy of Needle Rollers360 3 Tolerance of Deviation in LengthUnits: mmCage TypeExampleSingle RowDouble RowM CageFBN CageWelded CagePolyamide CageM CageFBN CageWelded CagePolyamide CageFWJ, FWFFBNFWJC, FWJWFWJEFBNPFWF WFBN WFDJC, FDJSFBNP WWJ CodeMetricInchClassTolerance in Average Value ofDiameterhighlowVDWPmaxRmaxVDWLmaxLWSD iameter Variation in aSingle Radial Plane, (1)Deviation fromCircular Form, (1)Diameter Variationwithin Gauge Lot, (1)Deviation in Length, (2)Note (1)Applies at the center of Roller s length.

4 (2)Depends on Lwclassification. h13 is shown in Table between the actual measured diameter at any point over the entire length of Roller and the actual maximum diameter at the center ofthe entire length must not exceed the following values:Class 2: mClass 3: mClass 5: mBasic & Needle Roller Assemblies5 cage & Needle Roller Assemblies4. Applications to Maximize Performance MountingIn cage and Roller Assemblies , the shaft and housing are generally used as raceway rings. It is important to satisfy the finishaccuracy and hardness requirements in Table 4. Accuracy and roughness of the raceway surfaceThe shaft and housing bore of cage and Roller assembliesare often used as raceway surfaces of Needle bearings inorder to achieve the most compact bearing design andenhance shaft rigidity, load capacity, and and roughness of the raceway surface greatlyaffect the life, noise, and accuracy of bearings.

5 Therefore,shape, accuracy, and roughness have to be treated withgreat care. In particular, harmful circumferential waviness and apolygonal shape are undesirable. Accuracy and roughnessfor raceway surfaces are shown in Table 4. Since thesevalues may change depending on the desiredperformance, please contact NSK. Material and heat treatment of raceway furnaceThe raceway rings and rollers of Needle bearings arerepeatedly stressed on their relatively small contactsurfaces. The materials for raceway rings, rollers, andshafts and housings that function as raceways, musttherefore have high hardness, resistance to permanentdeformation, and long rolling fatigue life. These materialsare also required to be resistant to wear and shock, andhave good dimensional stabilization. Common materialsused for shafts and housings that function as bearingraceways include the following:The hardened layer, which is tempered at a temperaturebetween 160 C and 180 C after hardening, has to developa martensite structure with an even distribution of very finecarbides.

6 In the case of cemented or induction hardeningof the raceway surface, the surface hardness should notonly be HRC58 to 64 (HRC60 to 64 is preferable), but also,the hardened layers with Vickers hardness of HV 653(HRC58) and HV550 ( ) have to reach appropriatedepths. When the values of hardness are below thesevalues, bearing fatigue life significantly decreases. Thehardened layer depth (up to HV550) after grinding finish isestimated by using the following equation:t ( ~ ) Dwwhere,t:Effective hardened layer depth (mm)Dw: Roller diameter (mm)Core hardness is generally HRC30 to 4 Accuracy and Hardness for Shaft and Housing Guide width for cage and Roller assembliesThe tolerances for the guide width, b, are based on cage width, Bc, and shown in Table 5(see Fig. 1).BcbTable 5 Tolerance for Guide Width, bFig. 1 Guide Width Fillet radiusThe fillet radius of the shaft and housing shoulder in contact with the cage end surface should not interfere with the cage itself.

7 Fitting tolerances for shafts and housing boresFitting tolerances for shafts and housing bores under various operating conditions are shown in Table 6. Shaft inclinationPermissible shaft inclinations from elastic deflection by anexternal force and mounting error are shown in Table shaft inclination exceeds that in this table, pleasecontact NSK, as it is necessary to change the amount ofroller crowning and increase internal 7 Shaft InclinationTable 6 Fitting Tolerances for Shafts and Housing BoresUnits: mmCarbon steel for machine construction (for carbonizing)S15CK (JIS G 4051)Chrome molybdenum steel (for carbonizing)SCM415~421 (JIS G 4105)Chrome steel (for carbonizing)SCr415, 420 (JIS G 4104)Nickel chrome steel (for carbonizing)SNC415~815 (JIS G 4102)Nickel chrome molybdenum steel (for carbonizing) SNCM220, 415, 420 (JIS G 4103)JIS: Japanese Industrial StandardOther materials, such as S50C and S55C, can be utilizedwith through hardening or induction to 64 Appropriate depth of hardenedlayer to 64 Appropriate depth of hardenedlayer requiredHousingCylindricity ToleranceRoughness, RaHardnessMetricTypeTolerance for b+ + + ConditionsFitting Tolerance for Housing BoreG6G6G6f6h5g5j5h5 Fitting Tolerance forShaftFw 50 mmFw> 50 mmHigh Accuracy,Oscillating MotionNormalHigh Temperature,Large Shaft Deflection,Mounting ErrorCage Width (mm)over Inclination (mm/mm) cage & Needle Roller AssembliesCage & Needle Roller AssembliesBcEw Fw BcEw Fw BcEw Fw BcEw Fw BcEw Fw BcEw Fw BcEw Fw BcEw Fw bearing NumbersBoundary Dimensions (mm)Basic Load Ratings (N)

8 7101 220 FBNP-58858 82 3301 860 FBNP-69869 82 2001 790 FBNP-691069103 3503 050 FBNP-7108710 8 2 8402 560 FBNP-71010710 10 3 6503 550 FBNP-8118811 8 3 0502 910 FBN-10138101383 4503 600 FBN-1013101013103 9504 300 FBN-10148101483 7503 300 FBN-1014101014104 8504 650 FBN-101413-E-11014136 5006 750 FBN-111515A-E1115157 4508 200 FBN-12159121594 3505 100 FBN-1215101215104 3505 100 FBN-1215121215125 4006 750 FBN-1215131215135 9507 600 FWF-1216101216105 7005 950 FWF-1216131216137 3508 350 FWF-1218121218129 1508 650 BN5013051317148 45010 100 FWF-1418101418106 7507 750 FWF-1418111418116 7507 750 FWF-1418131418138 0509 750 FWF-14181714181710 70014 100 FWF-14182014182012 10016 400 FWF-1420121420129 8509 800 FWF-1519101519107 0508 400 FWF-1519131519138 40010 500 FWF-15191715191711 20015 200 FWF-152121A15212116 30018 900 0006 150 40017 300 FWF-1620101620107 3509 000 FWF-1620131620138 80011 300 FWF-16201716201711 70016 300 FWF-1621101621108 6509 600 BN501622E1622129 85010 000 FWF-16211316211310 50012 300 FWF-16221216221210 50010 900 FWF-16221316221310 90011 500 FWF-16221716221714 70016 900 bearing NumbersBoundary Dimensions (mm)Basic Load Ratings (N)

9 DrawingFWEWBCCrC0rFWF-16222016222017 00020 300 FWF-16222216222218 70022 900 FWF-16222416222420 30025 600 FWF-16242016242020 80022 200 FWF-1721101721107 6509 650 FWJC-1721131721139 10012 100 FWJ-17211317211311 00014 000 FBNP-1721131721138 40010 900 60022 700 30042 000 FWF-1822101822107 90010 300 FWF-1822131822139 45012 900 FWF-18221718221712 60018 600 FBN-182228W18222816 10025 400 FWF-18232018232016 60022 900 FWF-18241218241211 70013 000 FWJ-18241718241718 70021 600 FWF-182420A18242018 90024 100 FWF-18242018242018 90024 100 FWF-18251718251716 50018 300 FWF-18252218252221 30025 500 FWF-1923131923139 90013 900 00025 800 FBNP-19241719241712 00015 200 FWJ-19242819242825 70037 000 BN50190319353230 50045 500 60036 500 00030 500 00030 500 FWF-2024102024108 00010 700 FWF-202413-0-22024139 70013 700 FWF-2024132024139 70013 700 FWF-20241720241712 40018 800 FWF-20261220261212 20014 100 FWF-20261320261313 10015 500 FWF-20261620261616 60021 000 10016 800 FWJ-20261720261719 40023 200 FWF-20262020262019 20025 200 FWF-20262420262423 20032 000 FWJE-20262920262926 10037 500 FWF-20282020282019 80021 700 M CageFBN CageWelded CagePolyamide cage (includes inch design)78 bearing NumbersBoundary Dimensions (mm)Basic Load Ratings (N)DrawingFWEWBCCrC0rBcEw Fw BcEw Fw BcEw Fw BcEw Fw BcEw Fw BcEw Fw BcEw Fw 9 cage & Needle Roller Assemblies10 cage & Needle Roller Assemblies BcEw Fw BcEw Fw bearing NumbersBoundary Dimensions (mm)Basic Load Ratings (N)

10 DrawingFWEWBCCrC0rBN50202020301925 60026 700 50037 000 FWF-21251721251713 10020 600 FWF-2226102226108 65012 200 FWF-22261322261310 30015 300 FWF-22281322281313 70016 700 FWF-222817A22281716 50021 300 FWF-22281722281717 30022 700 FWF-22282322282323 60034 000 20040 500 30021 900 FWF-22291622291617 10020 200 FWF-22301422301417 40019 000 FWF-223020 HSC22302025 20030 500 BN50222022302430 00038 500 FWJ-223027A22302730 00038 500 BN50225022321419 60019 300 00042 500 FWF-23282423282422 40036 000 10018 200 FWF-24281324281310 50016 100 10021 400 FWF-24281724281714 60024 700 FBN-242825W24282515 90027 400 FBN-24291324291310 70014 100 FWF-24301724301717 90024 300 FWJ-24301724301717 90024 300 FWJE-24301724301716 80022 300 10036 500 FWF-2529102529109 35014 100 FWF-25291325291311 30018 000 FWF-25291725291714 80025 500 FWF-25301325301313 90020 200 FWF-25301725301717 20026 400 FWF-25302025302018 80029 700 FWF-25302525302523 60039 500 FDJC-25304625304633 50062 000 FWF-25311325311315 00019 500 FWF-25311725311719 20026 800 FWF-25321625321618 70023 500 FWF-25322425322428 30040 000 FWF-25332025332025 10031 500 FWJN-25332025332029 30038 500 FWJ-25332425332434 00047 000 FWJ-253324B25332434 00047 000 FWJ-253324H25332434 00047 000 50041 500 00043 500 50040 000 70014 400 80036 000 50051 500 FWF-26301326301310 40016 200 FWF-26301726301714 40024 900 FBN-26302426302417 90032 500 60023 600 80035 000 FWF-28331328331313 70020 400 FWJC-28331328331312 50018 200 FBNP-28331328331312 10017 400 FWF-28331728331717 60028 300 FWJ-28332028332023 90037 500 70034 500 FWF-28352028352025 20035 500 FWF-28362028352026 20034 000 00054 500 BN502841-E28361419 00022 600 BN50281728381728 80033 500 BN502806-E328382030 50036 000 50051 500 90040 000 FWF-29342429342425 40046 000 FWF-29342729342726 60048 500