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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

 15000

Cone Part Number

 15123

Cup Part Number

 15243

Design Unit

 Inch

Cage Material

 Stamped Steel

Dimensions

d - Bore

 1 1/4 in31.750 mm

D - Cup Outer Diameter

 2.4375 in61.913 mm

B - Cone Width

 0.7500 in19.050 mm

C - Cup Width

 0.5625 in14.288 mm

T - Bearing Width

 0.7150 in18.161 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 0.14 in3.600 mm
r - Cup Backface "To Clear" Radius2 0.08 in2.03 mm

da - Cone Frontface Backing Diameter

 1.52 in38.5 mm

db - Cone Backface Backing Diameter

 1.79 in45.5 mm

Da - Cup Frontface Backing Diameter

 2.30 in58.42 mm

Db - Cup Backface Backing Diameter

 2.13 in54.10 mm

Ab - Cage-Cone Frontface Clearance

 0.1 in2.5 mm

Aa - Cage-Cone Backface Clearance

 -0.01 in-0.3 mm
a - Effective Center Location3 -0.19 in-4.8 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 3490 lbf15500 N
C1 - Dynamic Radial Rating (1 million revolutions)5 13500 lbf59900 N

C0 - Static Radial Rating

 12100 lbf53900 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 2090 lbf9310 N

Factors

K - Factor7 1.67
e - ISO Factor8 0.35
Y - ISO Factor9 1.71

G1 - Heat Generation Factor (Roller-Raceway)

 14.6

G2 - Heat Generation Factor (Rib-Roller End)

 10
Cg - Geometry Factor10 0.0606
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 These maximum fillet radii will be cleared by the bearing corners.
  • 3 Negative value indicates effective center inside cone backface.
  • 4 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 5 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 6 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values for a single-row, C90(2) is the two-row radial value.
  • 7 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 8 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 9 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 10 Geometry constant for Lubrication Life Adjustment Factor a3l.