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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 M257100

Cone Part Number

 N/A M257148DW

Cup Part Number

 N/A M257110

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Related Assembly Number(s)

 N/A M257148DW-902A1 M257148DW-902A2 M257148DW-902A3

Dimensions

d - Bore

 N/A 12 in304.8 mm

D - Cup Outer Diameter

 N/A 16.5 in419.1 mm

B - Double Cone Width

 N/A 5.1250 in130.175 mm

C - Cup Width

 N/A 2.1250 in53.975 mm

T - Bearing Width across Cups

 N/A 5.1250 in130.175 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 0.250 in6.4 mm

da - Cone Frontface Backing Diameter

 N/A 12.8 in325 mm

Db - Cup Backface Backing Diameter

 N/A 15.43 in391.90 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.18 in4.6 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3 N/A 69700 lbf310000 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 468000 lbf2080000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 121000 lbf540000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 39700 lbf176000 N

Factors

K - Factor7 N/A 1.76
e - ISO Factor8 N/A 0.33
Y1 - ISO Factor9 N/A 2.03
Y2 - ISO Factor10 N/A 3.02
Cg - Geometry Factor11 N/A 0.167

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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