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Part Number LM742749, Tapered Roller Bearings - Single Cones - Imperial

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This is the most basic and most widely used type of tapered roller bearing. It consists of two main separable parts: the cone (inner ring) assembly and the cup (outer ring). It is typically mounted in opposing pairs on a shaft.




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

Specifications

Series
LM742700

Cone Part Number
LM742749

Design Units
Imperial

Cage Type
Stamped Steel

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

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
43600 lbf
194000 N
1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
2 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.


Dimensions

d - Cone Bore
8 1/2 in
215.900 mm

B - Cone Width
1.8125 in
46.038 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.14 in
3.600 mm

da - Cone Frontface Backing Diameter
8.94 in
227 mm

db - Cone Backface Backing Diameter
9.17 in
233 mm

Ab - Cage-Cone Frontface Clearance
0.12 in
3 mm

Aa - Cage-Cone Backface Clearance
0.18 in
4.6 mm

a - Effective Center Location2
0.56 in
14.2 mm
1 These maximum fillet radii will be cleared by the bearing corners.
2 Negative value indicates effective center inside cone backface.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
25000 lbf
111000 N

C1 - Dynamic Radial Rating (1 million revolutions)2
96600 lbf
430000 N

C0 - Static Radial Rating
200000 lbf
892000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
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.


Factors

K - Factor1
1.21

G1 - Heat Generation Factor (Roller-Raceway)
867

G2 - Heat Generation Factor (Rib-Roller End)
225

Cg - Geometry Factor2
0.139
1 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
2 Geometry constant for Lubrication Life Adjustment Factor a3l.



 DOWNLOADS 

Tapered Roller Bearing Engineering Information
(PDF, 663KB)

Bearing Life Calculation Tool

Bearing Dimensional Tolerances