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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.

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Unit of Measure

Specifications

Series

N/A A2000

Cone Part Number

N/A A2031

Cup Part Number

N/A A2120D

Design Units

N/A Imperial

Bearing Weight

N/A 0.21 lb0.095 Kg

Cage Type

N/A Stamped Steel

Ab - Cage-Cone Frontface Clearance

N/A 0.09 in2.3 mm

Alternate Part Name

N/A A2031-A2120D

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 in0.500 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

Basic Load Ratings

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

Factors

K - Factor6 N/A 1.44
e - ISO Factor7 N/A 0.41
Y1 - ISO Factor8 N/A 1.67
Y2 - ISO Factor9 N/A 2.48
Cg - Geometry Factor10 N/A 0.0308
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 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.
  • 3 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 4 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.
  • 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 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 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 Geometry constant for Lubrication Life Adjustment Factor a3l.
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