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Part Number L21549, 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
L21549

Design Units
Imperial

Cage Type
Stamped Steel

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1
5620 lbf
25000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
1460 lbf
6480 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
5/8 in
15.875 mm

B - Cone Width
0.4330 in
10.998 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.050 in
1.270 mm

da - Cone Frontface Backing Diameter
0.77 in
19.5 mm

db - Cone Backface Backing Diameter
0.85 in
21.5 mm

Ab - Cage-Cone Frontface Clearance
0.08 in
2 mm

Aa - Cage-Cone Backface Clearance
-0.03 in
-0.8 mm

a - Effective Center Location2
-0.13 in
-3.3 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
836 lbf
3720 N

C1 - Dynamic Radial Rating (1 million revolutions)2
3230 lbf
14300 N

C0 - Static Radial Rating
3130 lbf
13900 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
456 lbf
2030 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
1.83

G1 - Heat Generation Factor (Roller-Raceway)
3

G2 - Heat Generation Factor (Rib-Roller End)
5.36

Cg - Geometry Factor2
0.0348
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