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Part Number 2578 - 2523-S
Part Number 2578 - 2523-S, Tapered Roller Bearings - TS (Tapered Single) 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.
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Specifications
·
Dimensions
·
Abutment and Fillet Dimensions
·
Basic Load Ratings
·
Factors
Specifications
Series
2500
Cone Part Number
2578
Cup Part Number
2523-S
Design Unit
Inch
Cage Material
Stamped Steel
Dimensions
d - Bore
1 1/8
in
28.575
mm
D - Cup Outer Diameter
2.7500
in
69.850
mm
B - Cone Width
0.9983
in
25.357
mm
C - Cup Width
0.7500
in
19.050
mm
T - Bearing Width
0.9375
in
23.813
mm
Abutment and Fillet Dimensions
R - Cone Backface "To Clear" Radius
1
0.09
in
2.300
mm
r - Cup Backface "To Clear" Radius
2
0.06
in
1.52
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
2.56
in
65.00
mm
Db - Cup Backface Backing Diameter
2.40
in
60.96
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 Location
3
-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
C
a90
- Dynamic Thrust Rating (90 million revolutions)
3
2280
lbf
10200
N
1
Based on 90 x 10
6
revolutions L
10
life, for The Timken Company life calculation method. C
90
and C
a90
are radial and thrust values.
2
Based on 1 x 10
6
revolutions L
10
life, for the ISO life calculation method.
3
Based on 90 x 10
6
revolutions L
10
life, for The Timken Company life calculation method. C
90
and C
a90
are radial and thrust values for a single-row, C
90(2)
is the two-row radial value.
Factors
K - Factor
1
2.14
e - ISO Factor
2
0.27
Y - ISO Factor
3
2.19
G1 - Heat Generation Factor (Roller-Raceway)
23.6
G2 - Heat Generation Factor (Rib-Roller End)
9.6
Cg - Geometry Factor
4
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.
VIEW CAD DRAWING
·
3D
·
2D ISO View
·
2D Sales Drawing
DOWNLOADS
Tapered Roller Bearing Engineering Information
(PDF, 663KB)
Bearing Life Calculation Tool
Bearing Dimensional Tolerances
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