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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 78000

Cone Part Number

 N/A 78255D

Cup Part Number

 N/A 78551

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Related Assembly Number(s)

 N/A 78255D-90077

Dimensions

d - Bore

 N/A 2.5586 in64.988 mm

D - Cup Outer Diameter

 N/A 5.5130 in140.030 mm

B - Double Cone Width

 N/A 2.5980 in65.989 mm

C - Cup Width

 N/A 0.9260 in23.520 mm

T - Bearing Width across Cups

 N/A 2.6020 in66.091 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 0.090 in2.29 mm

da - Cone Frontface Backing Diameter

 N/A 3.11 in78.95 mm

Db - Cup Backface Backing Diameter

 N/A 4.61 in117.09 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.08 in2 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3 N/A 9970 lbf44300 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 66900 lbf298000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 17400 lbf77200 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 14800 lbf65700 N

Factors

K - Factor7 N/A 0.67
e - ISO Factor8 N/A 0.87
Y1 - ISO Factor9 N/A 0.78
Y2 - ISO Factor10 N/A 1.16
Cg - Geometry Factor11 N/A 0.0884

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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