All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - Single Cups > Tapered Roller Bearings - Single Cups - Metric > Part Number Y30203  

Part Number Y30203, Tapered Roller Bearings - Single Cups - 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.




Specifications  · Dimensions  · Abutment and Fillet Dimensions  · Factors

Specifications

Series
30203

Cup Part Number
Y30203

Design Units
METRIC

Full Timken Part Number
30203


Dimensions

D - Cup Outer Diameter
40 mm
1.5748 in

C - Cup Width
11 mm
0.4331 in


Abutment and Fillet Dimensions

r - Cup Backface "To Clear" Radius1
1.02 mm
0.04 in

Da - Cup Frontface Backing Diameter
37.59 mm
1.48 in

Db - Cup Backface Backing Diameter
35.05 mm
1.38 in
1 These maximum fillet radii will be cleared by the bearing corners.


Factors

K - Factor1
1.69

e - ISO Factor2
0.35

Y - ISO Factor3
1.74

G1 - Heat Generation Factor (Roller-Raceway)
4.2

G2 - Heat Generation Factor (Rib-Roller End)
6

Cg - Geometry Factor4
0.0398
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.



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Tapered Roller Bearing Engineering Information
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Bearing Dimensional Tolerances