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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

 L44600

Cone Part Number

 L44645

Cup Part Number

 L44610

Design Unit

 Inch

Cage Material

 Stamped Steel

Dimensions

d - Bore

 1.0231 in25.987 mm

D - Cup Outer Diameter

 1.9800 in50.292 mm

B - Cone Width

 0.5800 in14.732 mm

C - Cup Width

 0.4200 in10.668 mm

T - Bearing Width

 0.5600 in14.224 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 0.14 in3.560 mm
r - Cup Backface "To Clear" Radius2 0.050 in1.27 mm

da - Cone Frontface Backing Diameter

 1.18 in30 mm

db - Cone Backface Backing Diameter

 1.44 in36.5 mm

Da - Cup Frontface Backing Diameter

 1.87 in47.50 mm

Db - Cup Backface Backing Diameter

 1.75 in44.45 mm

Ab - Cage-Cone Frontface Clearance

 0.05 in1.3 mm

Aa - Cage-Cone Backface Clearance

 0.02 in0.5 mm
a - Effective Center Location3 -0.13 in-3.3 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 2080 lbf9230 N
C1 - Dynamic Radial Rating (1 million revolutions)5 8010 lbf35600 N

C0 - Static Radial Rating

 7400 lbf32900 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 1330 lbf5910 N

Factors

K - Factor7 1.56
e - ISO Factor8 0.37
Y - ISO Factor9 1.6

G1 - Heat Generation Factor (Roller-Raceway)

 8.9

G2 - Heat Generation Factor (Rib-Roller End)

 8.93
Cg - Geometry Factor10 0.0526
  • 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.