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 78248C

Cup Part Number

 N/A 78513-B

Bore (d)

 N/A 2.5 in63.5 mm

O.D. (D)

 N/A 5.1259 in130.198 mm

Width (T)

 N/A 0.7871 in19.992 mm
Dynamic Radial Load Rating - 1M Revs (C1) 1 N/A 53200 lbf237000 N
Dynamic Radial Load Rating - 90M Revs (C90) 2 N/A 61300 N
e Factor3 N/A 0.87
K Factor 4 N/A 0.67

Series

 N/A 78000C
Y Factor 5 N/A 0.69

Other Dimensions

Inner Ring Width (B)

 N/A 1.3085 in33.236 mm

Outer Ring Width (C)

 N/A 0.9260 in23.520 mm

Outer Ring Flange O.D.(D1)

 N/A 5.4409 in138.199 mm

Outer Ring Flange Width (C2)

 N/A 0.2756 in7.000 mm
Effective Center Location6 N/A 0.33 in8.4 mm
Max Shaft Fillet Radius7 N/A 0.03 in0.8 mm

Shaft Backing Shoulder Diameter - Frontface (da)

 N/A 3.03 in77 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 3.62 in92 mm

Housing Backing Shoulder Diameter - Frontface (Da)

 N/A 5.19 in131.83 mm
Max Housing Fillet Radius8 N/A 0.09 in2.3 mm

Cage Location Relative to Frontface (Ab) 

 N/A 0.21 in5.3 mm

Cage Location Relative to Backface (Aa)

 N/A 0.22 in5.6 mm

Weight

 N/A 4.9 lb2.23 Kg

Ratings

Dynamic Axial Rating - 90M Revs (Ca90)9 N/A 20400 lbf90900 N

Static Radial Load Rating (C0)

 N/A 52600 lbf234000 N

Factors

G1 Factor

 N/A 71.3

G2 Factor

 N/A 17.6
Geometry Factor (Cg) 10 N/A 0.0926
  • 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.