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

Key Dimensions

Cone Part Number

 N/A 339X

Bore (d)

 N/A 1.378 in35.001 mm

Inner Ring Width (B)

 N/A 0.8820 in22.403 mm
Dynamic Radial Load Rating - 1M Revs (C1) 1 N/A 16600 lbf73600 N
Dynamic Radial Load Rating - 90M Revs (C90) 2 N/A 4290 lbf19100 N
e Factor 3 N/A 0.27
K Factor 4 N/A 2.14
Y Factor 5 N/A 2.2

Other Dimensions

Weight

 N/A 1.1 lb0.5 Kg
Effective Center Location6 N/A -0.25 in-6.4 mm
Max Shaft Fillet Radius7 N/A 0.080 in2.000 mm

Shaft Backing Shoulder Diameter - Frontface (da)

 N/A 1.63 in41.5 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 1.77 in45 mm

Cage Location rel. to BF (Aa)

 N/A 0.01 in0.3 mm

Cage Location rel. to FF (Ab)

 N/A 0.07 in1.8 mm

Ratings

Dynamic Axial Rating - 90M Revs (Ca90)8 N/A 2010 lbf8920 N

Static Radial Load Rating (CO)

 N/A 18700 lbf83400 N

Factors

Geometry Factor (Cg)9 N/A 0.0676
  • 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 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 5 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 6 Negative value indicates effective center inside cone backface.
  • 7 These maximum fillet radii will be cleared by the bearing corners.
  • 8 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.
  • 9 Geometry constant for Lubrication Life Adjustment Factor a3l.