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KOYO / Single-row / inch series

KOYO 3578R/20

Tapered roller bearings technical reference with manufacturer-sourced dimensions, characteristics and engineering resources.

Technical data available
Bore diameterd
44.45 mm
Outside diameterD
84.138 mm
WidthB
30.886 mm
Dynamic load ratingC
120 kN
Static load ratingC0
120 kN
Limiting speednG
4600 r/min

Use this page as a technical reference. Verify the current manufacturer specification and the complete application requirements before selection.

Technical data

Product specifications

Metric and imperial values are paired where the manufacturer provides both. Expand a section to review its parameters.

Core specifications9 parameters
Core specifications
ParameterSymbolValue
Variant / constructionSingle-row / Inch series
Bore diameterd44.45 mm
Outside diameterD84.138 mm
WidthB30.886 mm
Basic dynamic load ratingC120 kN
Basic static load ratingC0120 kN
Fatigue load limitPu18.2 kN
Limiting speednG4600 r/min
Mass≈m0.7 kg
Manufacturer Identity2 parameters
Manufacturer Identity
ParameterSymbolValue
BrandKOYO
Official Class Key050-010-020
Classification2 parameters
Classification
ParameterSymbolValue
Official Category PathTapered roller bearings - Single-row - Inch series
Official Classification 1Tapered roller bearings / Single-row / Inch series
Technical Data23 parameters
Technical Data
ParameterSymbolValue
d44.450 mm
D84.138 mm
T30.162 mm
B30.886 mm
C23.812 mm
R(Min.)3.6 mm
R1(Min.)3.2 mm
Basic Load Ratings : Cr120 kN
Basic Load Ratings : C0R120 kN
Fatigue Load Limit : Cu18.2 kN
Limiting Speeds(Grease Lub.)4600 min-1
Limiting Speeds(Oil Lub.)6200 min-1
Load Center Spread : A20.5 mm
Constant :E0.31
Axial Load Factors : Y11.96
Axial Load Factors : Y01.08
Da57.0 mm
Db51.0 mm
Da74.0 mm
Db79.5 mm
Ra(Max.)3.6 mm
Rb(Max.)3.2 mm
Mass(Refer.)0.7 kg

Technical documents & data sheet

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Record identity
KOYO 3578R/20
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