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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 M255400

Cone Part Number

 N/A M255449D

Design Units

 N/A Imperial

Cage Type

 N/A Pin-Type
C1 - Dynamic Radial Rating (1 million revolutions)1 N/A 267000 lbf1190000 N

C0 - Static Radial Rating

 N/A 567000 lbf2520000 N

Note

 N/A This part has a non-standard shoulder design. Please email customer CAD for shoulder details to ensure the proper design of mating components.

Dimensions

d - Cone Bore

 N/A 11.3750 in288.925 mm

B - Double Cone Width

 N/A 5.6875 in144.463 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius2 N/A 0.13 in3.300 mm

da - Cone Frontface Backing Diameter

 N/A 12.2 in310 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.22 in5.6 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)3 N/A 69300 lbf308000 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 466000 lbf2070000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 121000 lbf537000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 40100 lbf179000 N

Factors

K - Factor7 N/A 1.73

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 2300

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 287
Cg - Geometry Factor8 N/A 0.172
  • 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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