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  

Part Number LM121948D - LM121911, Tapered Roller Bearings - TDI (Tapered Double Inner) Imperial

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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.




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 1/4 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)