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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 LM121900

Cone Part Number

 N/A LM121948D

Cup Part Number

 N/A LM121911

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Related Assembly Number(s)

 N/A LM121948D-902A2 LM121948D-902A3 LM121948D-902A4

Dimensions

d - Bore

 N/A 4.25 in107.95 mm

D - Cup Outer Diameter

 N/A 6 in152.400 mm

B - Double Cone Width

 N/A 2.5625 in65.088 mm

C - Cup Width

 N/A 1.1250 in28.575 mm

T - Bearing Width across Cups

 N/A 2.5624 in65.085 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.03 in0.800 mm
r - Cup Backface "To Clear" Radius2 N/A 0.130 in3.30 mm

da - Cone Frontface Backing Diameter

 N/A 4.53 in115 mm

Db - Cup Backface Backing Diameter

 N/A 5.51 in139.95 mm

Ab - Cage-Cone Frontface Clearance

 N/A -0.03 in-0.8 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3 N/A 9810 lbf43600 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 65900 lbf293000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 17100 lbf75900 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 4740 lbf21100 N

Factors

K - Factor7 N/A 2.07
e - ISO Factor8 N/A 0.28
Y1 - ISO Factor9 N/A 2.39
Y2 - ISO Factor10 N/A 3.56

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 218
Cg - Geometry Factor11 N/A 0.137

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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