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 78238

Cup Part Number

 N/A 78551DF

Bore (d)

 N/A 2.375 in60.325 mm

O.D. (D)

 N/A 5.5100 in139.954 mm

Width (T)

 N/A 3.0625 in77.788 mm
Dynamic Radial Load Rating - 1M Revs (C1) 1 N/A 79300 lbf353000 N
Dynamic Radial Load Rating - 90M Revs (C90) 2 N/A 11800 lbf52600 N
Dynamic Radial Load Rating 2-Row - 90M Revs (C90-2row)3 N/A 20600 lbf91500 N
e Factor 4 N/A 0.87
K Factor 5 N/A 0.67

Series

 N/A 78000

Other Dimensions

Outer Ring Width (C)

 N/A 2.0395 in51.803 mm
Max Shaft Fillet Radius6 N/A 0.2 in5.1 mm
Max Housing Fillet Radius7 N/A 0.06 in1.5 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 3.46 in88 mm

Housing Backing Shoulder Diameter - Frontface (Da)

 N/A 5.19 in131.83 mm

Cage Location Relative to Backface (Aa)

 N/A 0.24 in6.1 mm
Effective Center Location8 N/A 0.31 in7.9 mm

Inner Ring Width (B)

 N/A 1.3085 in33.236 mm

Weight

 N/A 11.3 lb5.125 Kg

Ratings

Dynamic Axial Rating - 90M Revs (Ca90)9 N/A 17500 lbf77900 N

Factors

Y1 Factor 10 N/A 0.78
Y2 Factor 11 N/A 1.16
Geometry Factor (Cg) 12 N/A 0.0884
  • 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 Negative value indicates effective center inside cone backface.
  • 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 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 11 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 12 Geometry constant for Lubrication Life Adjustment Factor a3l.