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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.
Unit of Measure

Specifications

Series

 30304

Cup Part Number

 Y30304

Design Units

 METRIC

Full Timken Part Number

 30304

Dimensions

D - Cup Outer Diameter

 52 mm2.0472 in

C - Cup Width

 13 mm0.5118 in

Abutment and Fillet Dimensions

r - Cup Backface "To Clear" Radius1 1.52 mm0.06 in

Da - Cup Frontface Backing Diameter

 48.01 mm1.89 in

Db - Cup Backface Backing Diameter

 45.47 mm1.79 in

Factors

K - Factor2 1.95
e - ISO Factor3 0.3
Y - ISO Factor4 2

G1 - Heat Generation Factor (Roller-Raceway)

 7.5

G2 - Heat Generation Factor (Rib-Roller End)

 5.5
Cg - Geometry Factor5 0.0458
  • 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.