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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 LM742749DW - LM742710  
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Part Number LM742749DW - LM742710, 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
LM742700

Cone Part Number
LM742749DW

Cup Part Number
LM742710

Design Unit
Inch

Cage Material
Stamped Steel


Dimensions

d - Bore
8 1/2 in
215.900 mm

D - Cup Outer Diameter
11.25 in
285.750 mm

B - Double Cone Width
3.3750 in
85.725 mm

C - Cup Width
1.3750 in
34.925 mm

T - Bearing Width across Cups
3.3749 in
85.722 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.09 in
2.300 mm

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

da - Cone Frontface Backing Diameter
9.03 in
229.36 mm

Db - Cup Backface Backing Diameter
10.47 in
265.94 mm

Ab - Cage-Cone Frontface Clearance
0.12 in
3 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
25000 lbf
111000 N

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2
168000 lbf
748000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3
43600 lbf
194000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)4
20600 lbf
91800 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
1.21

e - ISO Factor2
0.48

Y1 - ISO Factor3
1.4

Y2 - ISO Factor4
2.09

G1 - Heat Generation Factor (Roller-Raceway)
867

Cg - Geometry Factor5
0.139
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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