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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TDI (Tapered Double Inner) > Tapered Roller Bearings - TDI (Tapered Double Inner) Imperial > Part Number LM121948D - LM121911  
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Part Number LM121948D - LM121911, Tapered Roller Bearings - TDI (Tapered Double Inner) Imperial


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: Imperial Metric Both

Specifications  · Dimensions  · Abutment and Fillet Dimensions  · Basic Load Ratings  · Factors  · Spacer

Specifications

Series
LM121900

Cone Part Number
LM121948D

Cup Part Number
LM121911

Design Unit
Inch

Cage Material
Stamped Steel

Related Assembly Number(s)
LM121948D-902A2
LM121948D-902A3
LM121948D-902A4


Dimensions

d - Bore
4.25 in
107.95 mm

D - Cup Outer Diameter
6 in
152.400 mm

B - Double Cone Width
2.5625 in
65.088 mm

C - Cup Width
1.1250 in
28.575 mm

T - Bearing Width across Cups
2.5624 in
65.085 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.03 in
0.800 mm

r - Cup Backface "To Clear" Radius2
0.130 in
3.30 mm

da - Cone Frontface Backing Diameter
4.53 in
115 mm

Db - Cup Backface Backing Diameter
5.51 in
139.95 mm

Ab - Cage-Cone Frontface Clearance
-0.03 in
-0.8 mm
1 These maximum fillet radii will be cleared by the bearing corners.
2 These maximum fillet radii will be cleared by the bearing corners.


Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)1
9810 lbf
43600 N

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2
65900 lbf
293000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3
17100 lbf
75900 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)4
4740 lbf
21100 N
1 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
2 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
3 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.
4 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.


Factors

K - Factor1
2.07

e - ISO Factor2
0.28

Y1 - ISO Factor3
2.39

Y2 - ISO Factor4
3.56

G1 - Heat Generation Factor (Roller-Raceway)
218

Cg - Geometry Factor5
0.137
1 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
2 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
4 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
5 Geometry constant for Lubrication Life Adjustment Factor a3l.


Spacer

Note
Spacer shows standard nominal .01 radii, actual bearing may vary


 MORE IMAGES 

·  Timken_TRB_2ROWASSY_TDI_39585D-90015-A

·  Timken_TRB_2ROWASSY_TDI_39585D-90015-A3

·  Timken_TRB_2ROWASSY_TDI_39585D-90015-T2



 DOWNLOADS 

Bearing Life Calculation Tool

Bearing Dimensional Tolerances

Tools and Guides for Engineers

TRB TDI Line Drawing
(JPG, 14KB)


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