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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Unit of Measure

Other Dimensions

Weight

 N/A 23.66 Kg52.19 lb

Width (T)

 N/A 4.5 in114.3 mm

C - Width

 N/A 3.25 in82.55 mm
Max Shaft Fillet Radius1 N/A 0.25 in6.4 mm
Max Housing Fillet Radius2 N/A 0.03 in0.8 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 10.39 in264 mm

Housing Backing Shoulder Diameter - Frontface (Da)

 N/A 12.4 in314.96 mm

Key Dimensions

Cone Part Number

 N/A 8578

Cup Part Number

 N/A 8520

Inner Spacer Part Number

 N/A X1S-8578

Outer Spacer Part Number

 N/A Y7S-8520

Design Unit

 N/A Inch

Bore (d)

 N/A 9.5 in241.3 mm

O.D. (D)

 N/A 12.875 in327.025 mm
Dynamic Radial Load Rating - 90M Revs (C90) 3 N/A 30700 lbf137000 N
Dynamic Radial Load Rating 2-Row - 90M Revs (C90-2row)4 N/A 53500 lbf238000 N
K Factor 5 N/A 1.44
e Factor 6 N/A 0.41

Ratings

C1 - Dynamic Radial Rating (1 million revolutions)7 N/A 206000 lbf918000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)8 N/A 21400 lbf95200 N

Factors

Y1 Factor 9 N/A 1.66
Y2 Factor 10 N/A 2.47
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 These maximum fillet radii will be cleared by the bearing corners.
  • 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 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.
  • 5 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 6 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 7 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 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.