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 XFA30309M

Bore (d)

 N/A 47.500 mm1.8701 in
Dynamic Radial Load Rating - 1M Revs (C1) 1 N/A 129000 N29000 lbf
Dynamic Radial Load Rating - 90M Revs (C90) 2 N/A 33500 N7530 lbf
K Factor 3 N/A 1.69

Other Dimensions

Weight

 N/A 1 Kg2.1 lb

Inner Ring Width (B)

 N/A 25.000 mm0.9843 in
Effective Center Location4 N/A -6.1 mm-0.24 in
Max Shaft Fillet Radius5 N/A 2.030 mm0.080 in

Shaft Backing Shoulder Dia. - Frontface (da)

 N/A 58 mm2.28 in

Shaft Backing Shoulder Dia. - Backface (db)

 N/A 61 mm2.4 in

Cage Location rel. to BF (Aa)

 N/A -0.5 mm-0.02 in

Cage Location rel. to FF (Ab)

 N/A 3.6 mm0.14 in

Ratings

Dynamic Axial Rating - 90M Revs (Ca90)6 N/A 19800 N4450 lbf

Static Radial Load Rating (C0)

 N/A 139000 N31300 lbf

Factors

G1 Factor

 N/A 41.9

G2 Factor

 N/A 18.4
Geometry Factor (Cg)7 N/A 0.0851
  • 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.