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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.
Unit of Measure

Specifications

Series

 N/A 25800

Cup Part Number

 N/A 25820

Design Units

 N/A Imperial

Dimensions

D - Cup Outer Diameter

 N/A 2.8750 in73.025 mm

C - Cup Width

 N/A 0.75 in19.05 mm

Abutment and Fillet Dimensions

r - Cup Backface "To Clear" Radius1 N/A 0.090 in2.29 mm

Da - Cup Frontface Backing Diameter

 N/A 2.72 in68.10 mm

Db - Cup Backface Backing Diameter

 N/A 2.52 in64.01 mm

Factors

e - ISO Factor2 N/A 0.29
Y - ISO Factor3 N/A 2.07
Cg - Geometry Factor4 N/A 0.0695
  • 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.