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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.
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Unit of Measure

Other Dimensions

Weight

 N/A 4.3 Kg9.5 lb

Inner Ring Width (B)

 N/A 2.5980 in65.989 mm
Max Shaft Fillet Radius1 N/A 0.09 in2.3 mm

Shaft Backing Shoulder Diameter - Frontface (da)

 N/A 3.11 in79 mm

Cage Location Relative to Frontface (Ab) 

 N/A 0.08 in2 mm

Key Dimensions

Series

 N/A 78000

Cone Part Number

 N/A 78251D

Bore (d)

 N/A 2.5 in63.5 mm
Dynamic Radial Load Rating - 90M Revs (C90) 2 N/A 9970 lbf44300 N
Dynamic Radial Load Rating - 1M Revs (C1) 3 N/A 38400 lbf171000 N
Dynamic Radial Load Rating 2-Row - 90M Revs (C90-2row) 4 N/A 17400 lbf77200 N
K Factor 5 N/A 0.67

Ratings

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)6 N/A 66900 lbf298000 N

Static Radial Load Rating (C0)

 N/A 43400 lbf193000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 14800 lbf65700 N

Factors

G1 Factor

 N/A 62.6

G2 Factor

 N/A 19.1
Geometry Factor (Cg)8 N/A 0.0884
  • 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.
  • 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 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 6 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 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 Geometry constant for Lubrication Life Adjustment Factor a3l.