SIFT BEARING STORE CATALOG

K25581-25520FAGTapered Roller

K25581-25520 is a FAG tapered roller bearing, bore 44.45 mm, O.D. 82.93 mm, width 25.4 mm. Dimensions, drawing, interchanges and price.

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Bore d44.45mm
Outside dia. D82.93mm
Width B25.4mm
Dynamic Cr81kN
Static C0r105kN
Limiting speed8,900rpm
Weight0.561kg
Cr / C0r0.77
Mean dia. dm63.7mm

Original catalogue drawing - FAG Schaeffler HR 1, page 618

K25581-25520 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. D82.93 mmBore d44.45 mmWidth B25.4 mmCup width C19.05 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 diameter44.451.75
DOutside diameter82.9313.265
BInner-ring / bearing width25.41
TOverall assembly width23.8120.9375
CCup / outer-ring width19.050.75

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)44.45
Outside dia. D (mm)82.931
Width B (mm)25.4
Overall width T (mm)23.812
Cup width C (mm)19.05
Inner-ring OD d1 (mm)64.1

Load ratings & speeds

Basic dynamic load rating Cr (lbs)18210
Basic static load rating Cor (lbs)23605
Basic dynamic load rating Cr (N)81000
Basic static load rating C0r (N)105000
Basic dynamic axial rating Ca (N)4.5
Fatigue limit load Cur (N)13000
Factor e0.33
Factor Y1.79
Factor Y00.99
Limiting speed nG (rpm)8,900
Effective load centre a (mm)18

Weight

Weight (kg)0.561

Mounting dimensions (fillets / shoulders)

Chamfer r2 min (mm)0.5
Shaft shoulder da (mm)50
Shaft shoulder db (mm)51
Housing shoulder Da (mm)74
Housing shoulder Db (mm)77
Housing fillet ra max (mm)0.5
Fillet rb max (mm)0.8

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 2,900 rpm
420,250102584
613,5003922,256
810,1251,0245,885
108,1002,15412,382
155,4008,32347,836

Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 81,000 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.618 (dimensions)

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

Interchange - same dimensions, other brands

DesignationBrandTypedDB/TDyn. ratingkg
25580/25520NSKTapered Roller44.4582.9325.417,200 lbs0.54
25580/25520TimkenTapered Roller44.4582.9325.490.5 kN0.56
25580/25523TimkenTapered Roller44.4582.9325.490.5 kN0.6
25580/25524TimkenTapered Roller44.4582.9325.490.5 kN0.56
25581/25520TimkenTapered Roller44.4582.9325.490.5 kN0.56
25582/25520TimkenTapered Roller44.4582.9325.490.5 kN0.55

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
AK33885-33822-XLFAGTapered Roller44.4595.2528.57131 kN1
K355-X-352FAGTapered Roller44.4590.1221.6974 kN0.694
K3782-3720-XLFAGTapered Roller44.4593.2630.3123 kN0.976
K49175-49368FAGTapered Roller44.4593.6631.75109 kN1.02
K49576-49520FAGTapered Roller44.45101.631.75108 kN1.27
K535-532-AFAGTapered Roller44.45111.1236.96146 kN1.88
KHM803149-HM803110FAGTapered Roller44.4588.929.3793 kN0.86
KHM804842-HM804810FAGTapered Roller44.4595.2529.37111 kN1.13

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