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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

Design Units

 N/A Imperial

Cage Type

 N/A Stamped Steel
C1 - Dynamic Radial Rating (1 million revolutions)1 N/A 76700 lbf341000 N

C0 - Static Radial Rating

 N/A 127000 lbf567000 N

Dimensions

d - Cone Bore

 N/A 5 1/2 in139.700 mm

B - Double Cone Width

 N/A 4.1875 in106.363 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius2 N/A 0.06 in1.5 mm

da - Cone Frontface Backing Diameter

 N/A 6.06 in154 mm

Ab - Cage-Cone Frontface Clearance

 N/A -0.09 in-2.3 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (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
Cg - Geometry Factor8 N/A 0.131
  • 1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 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 Geometry constant for Lubrication Life Adjustment Factor a3l.
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