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The configuration of the TDO provides a wide effective bearing spread, making it ideal for applications in which overturning moments are a significant load component. TDO bearings can be used in fixed positions or allowed to float in the housing bore.
Unit of Measure

Specifications

Series

 N/A 8500

Cone Part Number

 N/A NA8575SW

Cup Part Number

 N/A 8520CD

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Dimensions

d - Bore

 N/A 9.25 in234.95 mm

D - Cup Outer Diameter

 N/A 12.875 in327.025 mm

B - Cone Width

 N/A 2.3125 in58.738 mm

C - Double Cup Width

 N/A 3.25 in82.55 mm

T - Bearing Width across Cones

 N/A 4.6250 in117.475 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.25 in6.35 mm
r - Cup Backface "To Clear" Radius2 N/A 0.06 in1.5 mm

db - Cone Backface Backing Diameter

 N/A 10.2 in259 mm

Da - Cup Frontface Backing Diameter

 N/A 12.29 in311.91 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.31 in7.9 mm
a - Effective Center Location3 N/A 0.24 in6.1 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)4 N/A 30700 lbf137000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)5 N/A 21400 lbf95200 N

Factors

K - Factor6 N/A 1.44
e - ISO Factor7 N/A 0.41
Y1 - ISO Factor8 N/A 1.66
Y2 - ISO Factor9 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 Negative value indicates effective center inside cone backface.
  • 4 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 5 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.
  • 6 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 7 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 8 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 9 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
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