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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 755

Cone Part Number

 N/A 767D

Cup Part Number

 N/A 752AA

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Dimensions

d - Bore

 N/A 3 1/2 in88.900 mm

D - Cup Outer Diameter

 N/A 6-3/8 in161.925 mm

B - Double Cone Width

 N/A 4.2500 in107.950 mm

C - Cup Width

 N/A 1.5000 in38.100 mm

T - Bearing Width across Cups

 N/A 3.9979 in101.547 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 0.020 in0.51 mm

da - Cone Frontface Backing Diameter

 N/A 3.988 in101.3 mm

Db - Cup Backface Backing Diameter

 N/A 5.79 in147.07 mm

Ab - Cage-Cone Frontface Clearance

 N/A -0.03 in-0.8 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3 N/A 19100 lbf84800 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 128000 lbf570000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 33200 lbf148000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 11100 lbf49500 N

Factors

K - Factor7 N/A 1.71
e - ISO Factor8 N/A 0.34
Y1 - ISO Factor9 N/A 1.98
Y2 - ISO Factor10 N/A 2.95

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 177

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 32.4
Cg - Geometry Factor11 N/A 0.0945

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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