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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

Cone Part Number

 N/A 2578

Bore (d)

 N/A 1 1/8 in28.575 mm

Inner Ring Width (B)

 N/A 0.9983 in25.357 mm
Dynamic Radial Load Rating - 1M Revs (C1) 1 N/A 18800 lbf83700 N
Dynamic Radial Load Rating - 90M Revs (C90) 2 N/A 4880 lbf21700 N
K Factor 3 N/A 2.14

Other Dimensions

Weight

 N/A 2.63 lb1.192 Kg
Effective Center Location4 N/A -0.34 in-8.6 mm
Max Shaft Fillet Radius5 N/A 0.09 in2.3 mm

Shaft Backing Shoulder Diameter - Frontface (da)

 N/A 1.38 in35 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 1.54 in39 mm

Cage Location rel. to BF (Aa)

 N/A 0.02 in0.5 mm

Cage Location rel. to FF (Ab)

 N/A 0.06 in1.5 mm

Ratings

Dynamic Axial Rating - 90M Revs (Ca90)6 N/A 2280 lbf10200 N

Static Radial Load Rating (CO)

 N/A 21200 lbf94400 N

Factors

G1 Factor

 N/A 23.6

G2 Factor

 N/A 9.6
Geometry Factor (Cg)7 N/A 0.0656
  • 1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 2 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 4 Negative value indicates effective center inside cone backface.
  • 5 These maximum fillet radii will be cleared by the bearing corners.
  • 6 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.
  • 7 Geometry constant for Lubrication Life Adjustment Factor a3l.