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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 M255449DW

Cup Part Number

 N/A M255411

Design Unit

 N/A Inch

Cage Material

 N/A Pin-Type

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 - Bore

 N/A 11.3750 in288.925 mm

D - Cup Outer Diameter

 N/A 16.0216 in406.949 mm

B - Double Cone Width

 N/A 5.6875 in144.463 mm

C - Cup Width

 N/A 2.4016 in61.001 mm

T - Bearing Width across Cups

 N/A 5.6968 in144.699 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.13 in3.300 mm
r - Cup Backface "To Clear" Radius2 N/A 0.140 in3.56 mm

da - Cone Frontface Backing Diameter

 N/A 12.2 in310 mm

Db - Cup Backface Backing Diameter

 N/A 14.92 in378.97 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.22 in5.6 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 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
e - ISO Factor8 N/A 0.34
Y1 - ISO Factor9 N/A 2
Y2 - ISO Factor10 N/A 2.97
Cg - Geometry Factor11 N/A 0.172

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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