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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 745

Cone Part Number

 N/A 749A

Cup Part Number

 N/A 742D

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Related Assembly Number(s)

 N/A 749A-90030 749A-90039 749A-90040 749A-90041 749A-90068 749A-90070 749A-90081 749A-90107

Dimensions

d - Bore

 N/A 3 1/4 in82.550 mm

D - Cup Outer Diameter

 N/A 6-1/8 in155.575 mm

B - Cone Width

 N/A 1.8375 in46.673 mm

C - Double Cup Width

 N/A 3.3750 in85.725 mm

T - Bearing Width across Cones

 N/A 4.0000 in101.600 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.14 in3.600 mm
r - Cup Backface "To Clear" Radius2 N/A 0.06 in1.5 mm

db - Cone Backface Backing Diameter

 N/A 3.9 in99 mm

Da - Cup Frontface Backing Diameter

 N/A 5.64 in143.26 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.05 in1.3 mm
a - Effective Center Location3 N/A -0.47 in-11.9 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)4 N/A 21900 lbf97600 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)5 N/A 147000 lbf656000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)6 N/A 38200 lbf170000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 12200 lbf54400 N

Factors

K - Factor8 N/A 1.8
e - ISO Factor9 N/A 0.33
Y1 - ISO Factor10 N/A 2.08
Y2 - ISO Factor11 N/A 3.09
Cg - Geometry Factor12 N/A 0.0898
  • 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.
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