Aurora Bearing Company
Aurora Bearing Company
901 Aucutt Rd.
Montgomery, IL 60538
Phone: 630.859.2030 • Fax: 630.859.0971
Email: customersupport@aurorabearing.com • Website: www.aurorabearing.com
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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 245

Cup Part Number

 N/A 243

Design Units

 N/A Imperial

Dimensions

D - Cup Outer Diameter

 N/A 2.4409 in61.999 mm

C - Cup Width

 N/A 0.6693 in17 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 2.26 in57.40 mm

Db - Cup Backface Backing Diameter

 N/A 2.13 in54.10 mm

Factors

e - ISO Factor2 N/A 0.24
Cg - Geometry Factor3 N/A 0.0509
  • 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.