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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

 N/A 315

Cup Part Number

 N/A 314

Design Units

 N/A Imperial

Dimensions

D - Cup Outer Diameter

 N/A 3.1496 in80 mm

C - Cup Width

 N/A 0.8268 in21.001 mm

Abutment and Fillet Dimensions

r - Cup Backface "To Clear" Radius1 N/A 0.08 in2.03 mm

Da - Cup Frontface Backing Diameter

 N/A 2.74 in69.10 mm

Db - Cup Backface Backing Diameter

 N/A 2.68 in68.07 mm

Factors

e - ISO Factor2 N/A 0.25
Cg - Geometry Factor3 N/A 0.0602
  • 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 Geometry constant for Lubrication Life Adjustment Factor a3l.
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