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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 675

Cone Part Number

 N/A 688TD

Design Units

 N/A Imperial

Cage Type

 N/A Stamped Steel
C1 - Dynamic Radial Rating (1 million revolutions)1 N/A 56200 lbf250000 N

C0 - Static Radial Rating

 N/A 86700 lbf386000 N

Dimensions

d - Cone Bore

 N/A 3.9453 in100.211 mm

B - Double Cone Width

 N/A 3.7500 in95.250 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius2 N/A 0.03 in0.800 mm

da - Cone Frontface Backing Diameter

 N/A 4.45 in113 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.12 in3 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)3 N/A 14600 lbf64800 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 97800 lbf435000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 25400 lbf113000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 11700 lbf52200 N

Factors

K - Factor7 N/A 1.24
Cg - Geometry Factor8 N/A 0.106
  • 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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