The Timken Company
The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.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

Other Dimensions

Weight

 N/A 1.1 Kg2.4 lb

C - Cup Width

 N/A 0.9375 in23.813 mm
Max Housing Fillet Radius1 N/A 0.02 in0.51 mm

Housing Backing Shoulder Diameter - Frontface (Da)

 N/A 4.13 in104.90 mm

Housing Backing Shoulder Diameter - Backface (Db)

 N/A 3.94 in100.08 mm

Key Dimensions

Series

 N/A 3900

Cup Part Number

 N/A 3921XA

O.D. (D)

 N/A 4.3301 in109.985 mm
e Factor 2 N/A 0.4
Y Factor 3 N/A 1.49

Factors

Geometry Factor (Cg)4 N/A 0.109
  • 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 Geometry constant for Lubrication Life Adjustment Factor a3l.