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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 LM278800

Cone Part Number

 N/A LM278848D

Cup Part Number

 N/A LM278810

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 LM278848D-902A2 LM278848D-902A4

Dimensions

d - Bore

 N/A 23.0625 in585.788 mm

D - Cup Outer Diameter

 N/A 30.3750 in771.525 mm

B - Double Cone Width

 N/A 9.0625 in230.188 mm

C - Cup Width

 N/A 3.8125 in96.838 mm

T - Bearing Width across Cups

 N/A 9.0624 in230.185 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.25 in6.4 mm
r - Cup Backface "To Clear" Radius2 N/A 0.250 in6.35 mm

da - Cone Frontface Backing Diameter

 N/A 24.25 in616 mm

Db - Cup Backface Backing Diameter

 N/A 28.58 in725.93 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.31 in7.9 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3 N/A 192000 lbf853000 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 1290000 lbf5730000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 334000 lbf1490000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 109000 lbf486000 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

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 11600

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 784
Cg - Geometry Factor11 N/A 0.291

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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