Menu
Batch CAD Cart (0) ▾
  • Cart is empty
  1. Click Here for Batch Download
Request Information Add to CAD Cart
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 78000

Cone Part Number

 N/A 78238

Cup Part Number

 N/A 78551DF

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Dimensions

d - Bore

 N/A 2 3/8 in60.325 mm

D - Cup Outer Diameter

 N/A 5.5100 in139.954 mm

B - Cone Width

 N/A 1.3085 in33.236 mm

C - Double Cup Width

 N/A 2.0395 in51.803 mm

T - Bearing Width across Cones

 N/A 3.0625 in77.788 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.2 in5.1 mm
r - Cup Backface "To Clear" Radius2 N/A 0.06 in1.5 mm

db - Cone Backface Backing Diameter

 N/A 3.46 in88 mm

Da - Cup Frontface Backing Diameter

 N/A 5.19 in131.83 mm

Aa - Cage-Cone Backface Clearance

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

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)4 N/A 11800 lbf52600 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)5 N/A 79300 lbf353000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)6 N/A 20600 lbf91500 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 17500 lbf77900 N

Factors

K - Factor8 N/A 0.67
e - ISO Factor9 N/A 0.87
Y1 - ISO Factor10 N/A 0.78
Y2 - ISO Factor11 N/A 1.16
Cg - Geometry Factor12 N/A 0.0884
  • 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 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 6 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.
  • 7 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.
  • 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.
  • 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.
By clicking Submit, you consent to the personal information you provide being used in the manner as described in our Privacy Notice, including access to that information by Timken personnel who may be located outside your home country. In addition, you agree that the CAD drawings are for your personal, one-time use only, and that you will not modify or create any compilation or derivative work using the CAD drawings or distribute or display the CAD drawings on any website or other media.