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Part Number A2031, 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
A2000

Cone Part Number
A2031

Design Units
Imperial

Cage Type
Stamped Steel

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1
4230 lbf
18800 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
1100 lbf
4880 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
0.3125 in
7.938 mm

B - Cone Width
0.4246 in
10.785 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.02 in
0.50 mm

da - Cone Frontface Backing Diameter
0.49 in
12.5 mm

db - Cone Backface Backing Diameter
0.51 in
13 mm

Ab - Cage-Cone Frontface Clearance
0.09 in
2.3 mm

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

a - Effective Center Location2
-0.12 in
-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
630 lbf
2800 N

C1 - Dynamic Radial Rating (1 million revolutions)2
2430 lbf
10800 N

C0 - Static Radial Rating
2070 lbf
9230 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
437 lbf
1940 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
1.44

G1 - Heat Generation Factor (Roller-Raceway)
1.7

G2 - Heat Generation Factor (Rib-Roller End)
3.2

Cg - Geometry Factor2
0.0308
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