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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TS (Tapered Single) > Tapered Roller Bearings - TS (Tapered Single) Metric > Part Number 30208  
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Part Number 30208, Tapered Roller Bearings - TS (Tapered Single) Metric


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
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" Radius1
1.5 mm
0.06 in

r - Cup Backface "To Clear" Radius2
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 Location3
-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

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
11800 N
2650 lbf
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
1.56

e - ISO Factor2
0.37

Y - ISO Factor3
1.6

G1 - Heat Generation Factor (Roller-Raceway)
22.5

G2 - Heat Generation Factor (Rib-Roller End)
14.3

Cg - Geometry Factor4
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.



 DOWNLOADS 

Tapered Roller Bearing Engineering Information
(PDF, 663KB)

Bearing Life Calculation Tool

Bearing Dimensional Tolerances


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