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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 M268700

Cone Part Number

 N/A M268748D

Design Units

 N/A Imperial

Cage Type

 N/A Pin-Type
C1 - Dynamic Radial Rating (1 million revolutions)1 N/A 642000 lbf2860000 N

C0 - Static Radial Rating

 N/A 1250000 lbf5550000 N

Dimensions

d - Cone Bore

 N/A 16.3750 in415.925 mm

B - Double Cone Width

 N/A 8.2500 in209.550 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius2 N/A 0.380 in9.700 mm

da - Cone Frontface Backing Diameter

 N/A 17.79 in451.87 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.33 in8.4 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)3 N/A 166000 lbf740000 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 1120000 lbf4970000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 290000 lbf1290000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 94800 lbf421000 N

Factors

K - Factor7 N/A 1.76
Cg - Geometry Factor8 N/A 0.232
  • 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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