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 lower 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 LM278848D

Cup Part Number

 N/A LM278810

Bore (d)

 N/A 23.0625 in585.788 mm

O.D. (D)

 N/A 30.3750 in771.525 mm

Width (T)

 N/A 9.0624 in230.185 mm
Dynamic Radial Load Rating - 1M Revs (C1) 1 N/A 1290000 lbf5730000 N
Dynamic Radial Load Rating - 90M Revs (C90) 2 N/A 192000 lbf853000 N
Dynamic Radial Load Rating 2-Row - 90M Revs (C90-2row) 3 N/A 334000 lbf1490000 N
e Factor4 N/A 0.33
K Factor5 N/A 1.76

Note

 N/A This part has a non-standard shoulder design. Please email customer CAD for shoulder details to ensure the proper design of mating components.

Other Dimensions

Inner Ring Width (B)

 N/A 9.0625 in230.188 mm
Max Shaft Fillet Radius6 N/A 0.25 in6.4 mm
Max Housing Fillet Radius7 N/A 0.25 in6.35 mm

Shaft Backing Shoulder Diameter - Frontface (da)

 N/A 24.25 in616 mm

Housing Backing Shoulder Diameter - Backface (Db)

 N/A 28.58 in725.93 mm

Cage Location Relative to Frontface (Ab) 

 N/A 0.31 in7.9 mm

Outer Ring Width (C)

 N/A 3.8125 in96.838 mm

Series

 N/A LM278800

Weight

 N/A 3.3 lb1.5 Kg

Ratings

Dynamic Axial Rating - 90M Revs (Ca90) 8 N/A 109000 lbf486000 N

Factors

Y1 Factor 9 N/A 2.03
Y2 Factor 10 N/A 3.02

G1 Factor 

 N/A 11600

G2 Factor 

 N/A 784
Geometry Factor (Cg) 11 N/A 0.291

Spacer

Note

 N/A Spacer shows standard nominal .01 radii, actual bearing may vary
  • 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 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.
  • 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 These maximum fillet radii will be cleared by the bearing corners.
  • 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 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 10 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 11 Geometry constant for Lubrication Life Adjustment Factor a3l.