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This is the most basic and most widely used type of tapered roller bearing. It consists of two main separable parts: the cone (inner ring) assembly and the cup (outer ring). It is typically mounted in opposing pairs on a shaft.
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Unit of Measure

Other Dimensions

Weight

 N/A 2.5 Kg5.6 lb

C - Cup Width

 N/A 0.9058 in23.007 mm
Max Housing Fillet Radius1 N/A 0.14 in3.56 mm

Housing Backing Shoulder Diameter - Frontface (Da)

 N/A 5.22 in132.59 mm

Housing Backing Shoulder Diameter - Backface (Db)

 N/A 4.65 in118.11 mm

Key Dimensions

Series

 N/A 78000

Cup Part Number

 N/A 78571

O.D. (D)

 N/A 5.7080 in144.983 mm
e Factor 2 N/A 0.87
Y Factor 3 N/A 0.69

Factors

Geometry Factor (Cg)4 N/A 0.0884
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 4 Geometry constant for Lubrication Life Adjustment Factor a3l.