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Part Number 30208
Part Number 30208, Tapered Roller Bearings - TS (Tapered Single) Metric
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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
30208
Cone Part Number
X30208M
Cup Part Number
Y30208M
Design Unit
Metric
Cage Material
Stamped Steel
Related Assembly Number(s)
30208M-90KM1
Dimensions
d - Bore
40
mm
1.5748
in
D - Cup Outer Diameter
80
mm
3.1496
in
B - Cone Width
18
mm
0.7087
in
C - Cup Width
16
mm
0.6299
in
T - Bearing Width
19.75
mm
0.7776
in
Abutment and Fillet Dimensions
R - Cone Backface "To Clear" Radius
1
1.5
mm
0.06
in
r - Cup Backface "To Clear" Radius
2
1.5
mm
0.06
in
da - Cone Frontface Backing Diameter
47.5
mm
1.87
in
db - Cone Backface Backing Diameter
49.5
mm
1.95
in
Da - Cup Frontface Backing Diameter
75
mm
2.95
in
Db - Cup Backface Backing Diameter
71
mm
2.8
in
Ab - Cage-Cone Frontface Clearance
3.6
mm
0.14
in
Aa - Cage-Cone Backface Clearance
0
mm
0
in
a - Effective Center Location
3
-3
mm
-0.12
in
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
18400
N
4130
lbf
C1 - Dynamic Radial Rating (1 million revolutions)
2
70900
N
15900
lbf
C0 - Static Radial Rating
74700
N
16800
lbf
C
a90
- Dynamic Thrust Rating (90 million revolutions)
3
11800
N
2650
lbf
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
1.56
e - ISO Factor
2
0.37
Y - ISO Factor
3
1.6
G1 - Heat Generation Factor (Roller-Raceway)
22.5
G2 - Heat Generation Factor (Rib-Roller End)
14.3
Cg - Geometry Factor
4
0.0712
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
