The Timken Company
The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.com
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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

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.