The Timken Company
The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.com
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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.
Unit of Measure

Other Dimensions

Inner Ring Width (B)

 N/A 20.000 mm0.7874 in
Max Shaft Fillet Radius1 N/A 1.5 mm0.06 in

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 60 mm2.36 in

Cage Location Relative to Frontface (Ab) 

 N/A 0 mm0 in

Cage Location Relative to Backface (Aa)

 N/A 4.1 mm0.16 in
Effective Center Location2 N/A -2 mm-0.08 in

Key Dimensions

Cone Part Number

 N/A X30210UM

Bore (d)

 N/A 50.000 mm1.9685 in
Dynamic Radial Load Rating - 90M Revs (C90) 3 N/A 22300 N5010 lbf
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 150000 N33600 lbf
Dynamic Radial Load Rating 2-Row - 90M Revs (C90-2row) 5 N/A 38800 N8720 lbf
K Factor 6 N/A 1.39

Ratings

Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 16000 N3600 lbf
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 Negative value indicates effective center inside cone backface.
  • 3 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 4 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 5 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.
  • 6 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 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.