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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

 JL44642A

Cup Part Number

 JL44615

Design Unit

 Metric

Cage Material

 Stamped Steel

Dimensions

d - Bore

 25 mm0.9843 in

D - Cup Outer Diameter

 52 mm2.0472 in

B - Cone Width

 14.732 mm0.5800 in

C - Cup Width

 10.668 mm0.4200 in

T - Bearing Width

 14.224 mm0.5600 in

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 1.270 mm0.050 in
r - Cup Backface "To Clear" Radius2 1.27 mm0.050 in

da - Cone Frontface Backing Diameter

 30 mm1.18 in

db - Cone Backface Backing Diameter

 32 mm1.26 in

Da - Cup Frontface Backing Diameter

 48.51 mm1.91 in

Db - Cup Backface Backing Diameter

 45.47 mm1.79 in

Ab - Cage-Cone Frontface Clearance

 1 mm0.04 in

Aa - Cage-Cone Backface Clearance

 0.5 mm0.02 in
a - Effective Center Location3 -3.3 mm-0.13 in

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 9230 N2080 lbf
C1 - Dynamic Radial Rating (1 million revolutions)5 35600 N8010 lbf

C0 - Static Radial Rating

 32900 N7400 lbf
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 5910 N1330 lbf

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.