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 X31307

Bore (d)

 N/A 35 mm1.378 in
Dynamic Radial Load Rating - 1M Revs (C1) 1 N/A 86300 N19400 lbf
Dynamic Radial Load Rating - 90M Revs (C90) 2 N/A 22400 N5030 lbf
K Factor 3 N/A 0.71

Other Dimensions

Weight

 N/A 0.5 Kg1.2 lb

Inner Ring Width (B)

 N/A 21.000 mm0.8268 in
Effective Center Location4 N/A 3.3 mm0.13 in
Max Shaft Fillet Radius5 N/A 2.030 mm0.080 in

Shaft Backing Shoulder Dia. - Frontface (da)

 N/A 45 mm1.77 in

Shaft Backing Shoulder Dia. - Backface (db)

 N/A 56 mm2.2 in

Cage Location rel. to BF (Aa)

 N/A 2.5 mm0.1 in

Cage Location rel. to FF (Ab)

 N/A 3.6 mm0.14 in

Ratings

Dynamic Axial Rating - 90M Revs (Ca90)6 N/A 31600 N7110 lbf

Static Radial Load Rating (C0)

 N/A 74800 N16800 lbf

Factors

G1 Factor

 N/A 17.8

G2 Factor

 N/A 8.7
Geometry Factor (Cg)7 N/A 0.0839
  • 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.