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Part Number HM903249, 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

Cone Part Number
HM903249

Design Units
Imperial

Cage Type
Stamped Steel

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1
53400 lbf
237000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
13800 lbf
61600 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
1 3/4 in
44.450 mm

B - Cone Width
1.1250 in
28.575 mm


Abutment and Fillet Dimensions

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

da - Cone Frontface Backing Diameter
2.13 in
54 mm

db - Cone Backface Backing Diameter
2.56 in
65 mm

Ab - Cage-Cone Frontface Clearance
0.11 in
2.8 mm

Aa - Cage-Cone Backface Clearance
0.12 in
3 mm

a - Effective Center Location2
0.02 in
0.5 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
7950 lbf
35400 N

C1 - Dynamic Radial Rating (1 million revolutions)2
30700 lbf
136000 N

C0 - Static Radial Rating
29700 lbf
132000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
10100 lbf
44800 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
0.79

G1 - Heat Generation Factor (Roller-Raceway)
33.7

G2 - Heat Generation Factor (Rib-Roller End)
9.91

Cg - Geometry Factor2
0.101
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.



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Tapered Roller Bearing Engineering Information
(PDF, 663KB)

Bearing Life Calculation Tool

Bearing Dimensional Tolerances