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TDI bearings have a one-piece double inner race and two single outer races and are typically supplied complete with an outer race spacer as a pre-set assembly. The bearing can be used at fixed positions on rotation shaft applications. For rotating housing application it can be used to float on the stationary shaft.
Unit of Measure

Specifications

Series

 N/A 74000

Cone Part Number

 N/A 74555D

Cup Part Number

 N/A 74856

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Dimensions

d - Bore

 N/A 5 1/2 in139.700 mm

D - Cup Outer Diameter

 N/A 8.5625 in217.488 mm

B - Double Cone Width

 N/A 4.1875 in106.363 mm

C - Cup Width

 N/A 1.3750 in34.925 mm

T - Bearing Width across Cups

 N/A 3.7260 in94.640 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.06 in1.5 mm
r - Cup Backface "To Clear" Radius2 N/A 0.130 in3.30 mm

da - Cone Frontface Backing Diameter

 N/A 6.06 in154 mm

Db - Cup Backface Backing Diameter

 N/A 7.76 in197.10 mm

Ab - Cage-Cone Frontface Clearance

 N/A -0.09 in-2.3 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3 N/A 19900 lbf88400 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 134000 lbf594000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 34600 lbf154000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 16600 lbf73800 N

Factors

K - Factor7 N/A 1.2
e - ISO Factor8 N/A 0.49
Y1 - ISO Factor9 N/A 1.38
Y2 - ISO Factor10 N/A 2.06
Cg - Geometry Factor11 N/A 0.131

Spacer

Note

 N/A Spacer shows standard nominal .01 radii, actual bearing may vary
  • 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 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.
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