The Timken Company - Tapered Roller Bearings - Single Cups - Metric

Smarter Bearing Selection Is Here

The Timken^® Syber^® Bearing System Designer Tool now features Smart Selection, enabling users to find the right bearing faster by filtering options based on target life and key dimensions.

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Analyze Bearing Performance in an Application with Timken^® Syber^® Bearing System Designer

A powerful software tool that combines calculators and configurators to assist you with application design, bearing selection, installation, and troubleshooting. It’s free, easy-to-use, and accessible 24/7.

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Unit of Measure

Items	Y30302 Tapered Roller Bearings - Single Cups - Metric	Y30203 Tapered Roller Bearings - Single Cups - Metric	Y30303 Tapered Roller Bearings - Single Cups - Metric	Y30204M Tapered Roller Bearings - Single Cups - Metric	Y30304 Tapered Roller Bearings - Single Cups - Metric
Series	N/A 30302	N/A 30203	N/A 30303	N/A 30204M	N/A 30304
Cup Part Number	N/A Y30302	N/A Y30203	N/A Y30303	N/A Y30204M	N/A Y30304
Design Units	N/A METRIC
D - Cup Outer Diameter	N/A 42 mm1.6535 in	N/A 40 mm1.5748 in	N/A 47 mm1.8504 in	N/A 47 mm1.8504 in	N/A 52 mm2.0472 in
C - Cup Width	N/A 11 mm0.4331 in	N/A 11 mm0.4331 in	N/A 12 mm0.4724 in	N/A 12 mm0.4724 in	N/A 13 mm0.5118 in
r - Cup Backface "To Clear" Radius¹	N/A 1.02 mm0.04 in	N/A 1.02 mm0.04 in	N/A 1.02 mm0.04 in	N/A 1.02 mm0.04 in	N/A 1.52 mm0.06 in
Da - Cup Frontface Backing Diameter	N/A 39.12 mm1.54 in	N/A 37.59 mm1.48 in	N/A 43.43 mm1.71 in	N/A 43.94 mm1.73 in	N/A 48.01 mm1.89 in
Db - Cup Backface Backing Diameter	N/A 36.58 mm1.44 in	N/A 35.05 mm1.38 in	N/A 41.40 mm1.63 in	N/A 40.89 mm1.61 in	N/A 45.47 mm1.79 in
K - Factor²	N/A 2.05	N/A 1.69	N/A 2.05	N/A 1.69	N/A 1.95
e - ISO Factor³	N/A 0.29	N/A 0.35	N/A 0.29	N/A 0.35	N/A 0.3
Y - ISO Factor⁴	N/A 2.11	N/A 1.74	N/A 2.11	N/A 1.74	N/A 2
G1 - Heat Generation Factor (Roller-Raceway)	N/A 4.3	N/A 4.2	N/A 5.8	N/A 7.1	N/A 7.5
G2 - Heat Generation Factor (Rib-Roller End)	N/A 4.6	N/A 6	N/A 5	N/A 7.3	N/A 5.5
Cg - Geometry Factor⁵	N/A 0.0375	N/A 0.0398	N/A 0.0412	N/A 0.0474	N/A 0.0458
Full Timken Part Number	N/A 30302	N/A 30203	N/A 30303	N/A 30204	N/A 30304
¹ These maximum fillet radii will be cleared by the bearing corners. 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 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use. ⁵ Geometry constant for Lubrication Life Adjustment Factor a3l.