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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

Key Dimensions

Bore (d)

 N/A 3 in76.2 mm
Dynamic Radial Load Rating - 90M Revs (C90) 1 N/A 14400 lbf64000 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2 N/A 96700 lbf430000 N
Dynamic Radial Load Rating 2-Row - 90M Revs (C90-2row) 3 N/A 25100 lbf112000 N
K Factor 4 N/A 1.43

Other Dimensions

Inner Ring Width (B)

 N/A 1.875 in47.625 mm
Max Shaft Fillet Radius5 N/A 0.14 in3.5 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 3.66 in93 mm

Cage Location Relative to Frontface (Ab) 

 N/A -0.09375 in-2.38125 mm

Cage Location Relative to Backface (Aa)

 N/A 0.1875 in4.7625 mm
Effective Center Location6 N/A -0.31 in-7.9 mm

Ratings

Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 10100 lbf44800 N
  • 1 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 2 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 3 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values for a single-row, C90(2) is the two-row radial value.
  • 4 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 5 These maximum fillet radii will be cleared by the bearing corners.
  • 6 Negative value indicates effective center inside cone backface.
  • 7 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values for a single-row, C90(2) is the two-row radial value.