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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 78000C

Cup Part Number

 N/A 78549D

Design Units

 N/A Imperial

Dimensions

D - Cup Outer Diameter

 N/A 5.5000 in139.700 mm

C - Double Cup Width

 N/A 2.0395 in51.803 mm

Abutment and Fillet Dimensions

r - Cup Backface "To Clear" Radius1 N/A 0.06 in1.5 mm

Da - Cup Frontface Backing Diameter

 N/A 5.19 in131.83 mm

Factors

K - Factor2 N/A 0.67
e - ISO Factor3 N/A 0.87
Y1 - ISO Factor4 N/A 0.78
Y2 - ISO Factor5 N/A 1.16

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 71.3

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 17.6
Cg - Geometry Factor6 N/A 0.0926
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 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 Geometry constant for Lubrication Life Adjustment Factor a3l.
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