Montage of Timken Bearing Products
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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 A2000

Cone Part Number

 N/A A2031

Cup Part Number

 N/A A2120D

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Dimensions

d - Bore

 N/A 0.3125 in7.938 mm

D - Cup Outer Diameter

 N/A 1.2000 in30.480 mm

B - Cone Width

 N/A 0.4246 in10.785 mm

C - Double Cup Width

 N/A 0.8370 in21.260 mm

T - Bearing Width across Cones

 N/A 0.9999 in25.397 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.02 in0.50 mm

db - Cone Backface Backing Diameter

 N/A 0.51 in13 mm

Da - Cup Frontface Backing Diameter

 N/A 1.12 in28.40 mm

Aa - Cage-Cone Backface Clearance

 N/A -0.03 in-0.8 mm
a - Effective Center Location2 N/A -0.12 in-3 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3 N/A 630 lbf2800 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 4230 lbf18800 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 1100 lbf4880 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 437 lbf1940 N

Factors

K - Factor7 N/A 1.44
e - ISO Factor8 N/A 0.41
Y1 - ISO Factor9 N/A 1.67
Y2 - ISO Factor10 N/A 2.48
Cg - Geometry Factor11 N/A 0.0308
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 Negative value indicates effective center inside cone backface.
  • 3 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 4 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 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 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 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.
  • 10 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 11 Geometry constant for Lubrication Life Adjustment Factor a3l.