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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Key Features

  • Available in single, double and multi-row configurations, as well as proprietary sizes
  • Designed in collaboration with OE engineers to design, engineer and test bearings for premium performance in many applications
  • Power dense designs allow for heavier loads and can help extend bearing life
  • Optimized internal geometry lowers torque and operating temperatures to extend lubrication system life
  • Can be designed to withstand high-corrosive, high-temperature and vacuum or low-lubrication environments with proprietary enhancements
Unit of Measure

Key Dimensions

Cone Part Number

 N/A 28985

Cup Part Number

 N/A 28921-B

Bore (d)

 N/A 2.375 in60.325 mm

O.D. (D)

 N/A 3.9370 in100.000 mm

Width (T)

 N/A 0.375 in9.525 mm
Dynamic Radial Load Rating - 1M Revs (C1) 1 N/A 23800 lbf106000 N
Dynamic Radial Load Rating - 90M Revs (C90) 2 N/A 6180 lbf27500 N
e Factor3 N/A 0.43
K Factor 4 N/A 1.37

Series

 N/A 28900
Y Factor 5 N/A 1.41

Other Dimensions

Inner Ring Width (B)

 N/A 1 in25.4 mm

Outer Ring Width (C)

 N/A 0.7813 in19.845 mm

Outer Ring Flange O.D.(D1)

 N/A 4.093 in103.962 mm

Outer Ring Flange Width (C2)

 N/A 0.1563 in3.97 mm
Effective Center Location6 N/A -0.1 in-2.5 mm
Max Shaft Fillet Radius7 N/A 0.14 in3.6 mm

Shaft Backing Shoulder Diameter - Frontface (da)

 N/A 2.64 in67 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 2.87 in73 mm

Housing Backing Shoulder Diameter - Frontface (Da)

 N/A 3.9 in98.04 mm
Max Housing Fillet Radius8 N/A 0.13 in3.3 mm

Cage Location Relative to Frontface (Ab) 

 N/A 0.09 in2.3 mm

Cage Location Relative to Backface (Aa)

 N/A 0.05 in1.3 mm

Weight

 N/A 1 lb0.4 Kg

Ratings

Dynamic Axial Rating - 90M Revs (Ca90)9 N/A 4500 lbf20000 N

Static Radial Load Rating (C0)

 N/A 33500 lbf149000 N

Factors

G1 Factor

 N/A 60.1

G2 Factor

 N/A 24.5
Geometry Factor (Cg) 10 N/A 0.103
  • 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 These maximum fillet radii will be cleared by the bearing corners.
  • 9 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.
  • 10 Geometry constant for Lubrication Life Adjustment Factor a3l.