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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 LM249700

Cone Part Number

 N/A LM249748

Cup Part Number

 N/A LM249710CD

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Related Assembly Number(s)

 N/A LM249748-902A7 LM249748-902A8 LM249748-902B1 LM249748-902B2 LM249748-902B3 LM249748-902B9 LM249748-902D6 LM249748-902D7 LM249748-902E6 LM249748-903B9

Dimensions

d - Bore

 N/A 10 in254 mm

D - Cup Outer Diameter

 N/A 13.6875 in347.663 mm

B - Cone Width

 N/A 1.6875 in42.863 mm

C - Double Cup Width

 N/A 2.75 in69.85 mm

T - Bearing Width across Cones

 N/A 3.7500 in95.250 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 10.71 in272 mm

Da - Cup Frontface Backing Diameter

 N/A 13.15 in334.00 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.11 in2.8 mm
a - Effective Center Location3 N/A 0.34 in8.6 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)4 N/A 35700 lbf159000 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)5 N/A 240000 lbf1070000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)6 N/A 62200 lbf277000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 20300 lbf90500 N

Factors

K - Factor8 N/A 1.76
e - ISO Factor9 N/A 0.33
Y1 - ISO Factor10 N/A 2.03
Y2 - ISO Factor11 N/A 3.02
Cg - Geometry Factor12 N/A 0.129
  • 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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