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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TS (Tapered Single) > Tapered Roller Bearings - TS (Tapered Single) Imperial > Part Number 2578 - 2520  
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Part Number 2578 - 2520, Tapered Roller Bearings - TS (Tapered Single) Imperial


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.



Unit of Measure: Imperial Metric Both

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

Specifications

Series
2500

Cone Part Number
2578

Cup Part Number
2520

Design Unit
Inch

Cage Material
Stamped Steel


Dimensions

d - Bore
1.1250 in
28.575 mm

D - Cup Outer Diameter
2.6150 in
66.421 mm

B - Cone Width
0.9983 in
25.357 mm

C - Cup Width
0.8125 in
20.638 mm

T - Bearing Width
1.0000 in
25.400 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
1.38 in
35 mm

db - Cone Backface Backing Diameter
1.54 in
39 mm

Da - Cup Frontface Backing Diameter
2.48 in
62.99 mm

Db - Cup Backface Backing Diameter
2.24 in
56.90 mm

Ab - Cage-Cone Frontface Clearance
0.06 in
1.5 mm

Aa - Cage-Cone Backface Clearance
0.02 in
0.5 mm

a - Effective Center Location3
-0.34 in
-8.6 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.
3 Negative value indicates effective center inside cone backface.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
4880 lbf
21700 N

C1 - Dynamic Radial Rating (1 million revolutions)2
18800 lbf
83700 N

C0 - Static Radial Rating
21200 lbf
94400 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
2280 lbf
10200 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
2.14

e - ISO Factor2
0.27

Y - ISO Factor3
2.19

G1 - Heat Generation Factor (Roller-Raceway)
23.6

G2 - Heat Generation Factor (Rib-Roller End)
9.6

Cg - Geometry Factor4
0.0656
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 Geometry constant for Lubrication Life Adjustment Factor a3l.



 DOWNLOADS 

Tapered Roller Bearing Engineering Information
(PDF, 663KB)

Bearing Life Calculation Tool

Bearing Dimensional Tolerances



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