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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 M270700

Cone Part Number

 N/A M270749D

Cup Part Number

 N/A M270710

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.

Related Assembly Number(s)

 N/A M270749D-902B3 M270749D-902D1 M270749D-902F7 M270749D-902G1

Dimensions

d - Bore

 N/A 17.6250 in447.675 mm

D - Cup Outer Diameter

 N/A 25.0000 in635.000 mm

B - Double Cone Width

 N/A 8.8125 in223.838 mm

C - Cup Width

 N/A 3.7500 in95.250 mm

T - Bearing Width across Cups

 N/A 8.8125 in223.838 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 in6.35 mm

da - Cone Frontface Backing Diameter

 N/A 18.82 in478 mm

Db - Cup Backface Backing Diameter

 N/A 23.27 in591.06 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.34 in8.6 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3 N/A 191000 lbf849000 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 1280000 lbf5700000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 332000 lbf1480000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 109000 lbf484000 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 0.246

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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