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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 121000

Cup Part Number

 N/A 121265

Design Units

 N/A Imperial

Dimensions

D - Cup Outer Diameter

 N/A 26.5000 in673.100 mm

C - Cup Width

 N/A 4.5 in114.3 mm

Abutment and Fillet Dimensions

r - Cup Backface "To Clear" Radius1 N/A 0.250 in6.35 mm

Da - Cup Frontface Backing Diameter

 N/A 24.15 in611.90 mm

Db - Cup Backface Backing Diameter

 N/A 23.74 in603.00 mm

Factors

K - Factor2 N/A 1.55
e - ISO Factor3 N/A 0.38
Y - ISO Factor4 N/A 1.6

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 4540

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 230.6
Cg - Geometry Factor5 N/A 0.223
  • 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.