SIFT BEARING STORE CATALOG

K3478-3420FAGTapered Roller

K3478-3420 is a FAG tapered roller bearing, bore 34.92 mm, O.D. 79.38 mm, width 29.77 mm. Dimensions, drawing, interchanges and price.

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Bore d34.92mm
Outside dia. D79.38mm
Width B29.77mm
Dynamic Cr90kN
Static C0r110kN
Limiting speed9,400rpm
Weight0.785kg
Cr / C0r0.82
Mean dia. dm57.1mm

Original catalogue drawing - FAG Schaeffler HR 1, page 614

K3478-3420 FAG Tapered Roller bearing catalogue drawing

Scanned from the manufacturer catalogue page listing this part number. All part numbers printed on that table share the same drawing.

Scale cross-section

DdBOutside dia. D79.38 mmBore d34.92 mmWidth B29.77 mmCup width C23.81 mm

Blue = inner / outer ring, yellow = rolling element. Drawn to scale from this part's own dimensions for selection reference only - not a manufacturing or assembly drawing.

Dimension table (mm / inch)

SymbolDimensionmminch
dBore diameter34.9251.375
DOutside diameter79.3753.125
BInner-ring / bearing width29.7711.1721
TOverall assembly width29.371.1563
CCup / outer-ring width23.8120.9375

Notes

Weights are given in kg. Load ratings are shown in both the original catalogue units and the converted value (1 N = 0.2248 lbf). Data is provided for selection reference only - confirm against the latest official catalogue before ordering.

Main dimensions

Bore d (mm)34.925
Outside dia. D (mm)79.375
Width B (mm)29.771
Overall width T (mm)29.37
Cup width C (mm)23.812
Inner-ring OD d1 (mm)57.5

Load ratings & speeds

Basic dynamic load rating Cr (lbs)20233
Basic static load rating Cor (lbs)24729
Basic dynamic load rating Cr (N)90000
Basic static load rating C0r (N)110000
Basic dynamic axial rating Ca (N)2
Fatigue limit load Cur (N)13500
Factor e0.37
Factor Y1.64
Factor Y00.9
Limiting speed nG (rpm)9,400
Effective load centre a (mm)21

Weight

Weight (kg)0.785

Mounting dimensions (fillets / shoulders)

Chamfer r2 min (mm)3.6
Shaft shoulder da (mm)43.5
Shaft shoulder db (mm)50
Housing shoulder Da (mm)67
Housing shoulder Db (mm)74
Housing fillet ra max (mm)3.6
Fillet rb max (mm)3.3

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 3,000 rpm
422,500102564
615,0003922,181
811,2501,0245,689
109,0002,15411,969
156,0008,32346,241

Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 90,000 N. Hours = L10 x 106 / (60n). Life-modification factors for lubrication, contamination and temperature (aISO) are not included.

Source & traceability

BrandFAG
Source catalogueFAG / Schaeffler Rolling Bearings HR 1
Catalogue pagep.614 (dimensions)

Load ratings in newtons, fatigue limit load Cur, limiting speed nG and reference speed nB.

Interchange - same dimensions, other brands

DesignationBrandTypedDB/TDyn. ratingkg
3478/3420TimkenTapered Roller34.9279.3829.77105 kN0.69
3482/3420TimkenTapered Roller34.9279.3829.77105 kN0.7

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
K25877-25821-XLFAGTapered Roller34.9273.0324.6178 kN0.462
K31594-31520FAGTapered Roller34.9276.228.5777 kN0.636
KHM88649-HM88610FAGTapered Roller34.9272.2325.469 kN0.5
KHM89446-HM89410FAGTapered Roller34.9276.228.5779 kN0.664
KLM48548-A-LM48510FAGTapered Roller34.9265.0918.2946.5 kN0.261
KLM48548-LM48510FAGTapered Roller34.9265.0918.2945.5 kN0.273
KLM48549-X-LM48510FAGTapered Roller34.9265.0918.2946.5 kN0.278
KL68149-L68110FAGTapered Roller34.9959.1316.7633 kN0.171

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