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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 129000

Cup Part Number

 N/A 129174

Design Units

 N/A Imperial

Dimensions

D - Cup Outer Diameter

 N/A 17.3208 in439.948 mm

C - Cup Width

 N/A 2.125 in53.975 mm

Abutment and Fillet Dimensions

r - Cup Backface "To Clear" Radius1 N/A 0.190 in4.83 mm

Da - Cup Frontface Backing Diameter

 N/A 16.3 in411.50 mm

Db - Cup Backface Backing Diameter

 N/A 16.02 in406.91 mm

Factors

K - Factor2 N/A 1.4
e - ISO Factor3 N/A 0.42
Y - ISO Factor4 N/A 1.44

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 1882.6

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 272.9
Cg - Geometry Factor5 N/A 0.171
  • 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.