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KOYO / Four-row tapered roller bearings

KOYO M263349D/310/310D

Rolling mill roll neck bearings technical reference with manufacturer-sourced dimensions, characteristics and engineering resources.

Technical data available
Bore diameterd
355.6 mm
Outside diameterD
488.95 mm
WidthB
317.5 mm
Dynamic load ratingC
4690 kN
Static load ratingC0
10900 kN
Mass≈m
182 kg

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 specifications8 parameters
Core specifications
ParameterSymbolValue
Variant / constructionFour-row tapered roller bearings
Bore diameterd355.6 mm
Outside diameterD488.95 mm
WidthB317.5 mm
Basic dynamic load ratingC4690 kN
Basic static load ratingC010900 kN
Fatigue load limitPu1060 kN
Mass≈m182 kg
Manufacturer Identity2 parameters
Manufacturer Identity
ParameterSymbolValue
BrandKOYO
Official Class Key140-020-000
Classification2 parameters
Classification
ParameterSymbolValue
Official Category PathRolling mill roll neck bearings - Four-row tapered roller bearings
Official Classification 1Rolling mill roll neck bearings / Four-row tapered roller bearings
Technical Data19 parameters
Technical Data
ParameterSymbolValue
d355.600 mm
D488.950 mm
T317.500 mm
W317.500 mm
R(Min.)3.2 mm
R1(Min.)1.6 mm
Basic Load Ratings : Cr4690 kN
Basic Load Ratings : C0R10900 kN
Fatigue Load Limit : Cu1060 kN
Axial Load Factors : Y22.03 mm
Axial Load Factors : Y33.02
Axial Load Factors : Y01.98
Constant E0.33
Da(Min.)383 mm
Da(Max.)452 mm
S(Min.)7.5 mm
Ra(Max.)3.2 mm
Rb(Max.)1.6 mm
Mass(Refer.)182 kg

Technical documents & data sheet

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Record identity
KOYO M263349D/310/310D
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