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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

 L68100

Cone Part Number

 L68149

Cup Part Number

 L68110

Design Unit

 Inch

Cage Material

 Stamped Steel

Related Assembly Number(s)

 L68149-902A2 L68149-90404

Dimensions

d - Bore

 1.3775 in34.989 mm

D - Cup Outer Diameter

 2.3280 in59.131 mm

B - Cone Width

 0.6600 in16.764 mm

C - Cup Width

 0.4700 in11.938 mm

T - Bearing Width

 0.6250 in15.875 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

 1.54 in39 mm

db - Cone Backface Backing Diameter

 1.79 in45.5 mm

Da - Cup Frontface Backing Diameter

 2.24 in55.90 mm

Db - Cup Backface Backing Diameter

 2.09 in53.09 mm

Ab - Cage-Cone Frontface Clearance

 0.06 in1.5 mm

Aa - Cage-Cone Backface Clearance

 0.01 in0.3 mm
a - Effective Center Location3 -0.1 in-2.5 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 2650 lbf11800 N
C1 - Dynamic Radial Rating (1 million revolutions)5 10200 lbf45500 N

C0 - Static Radial Rating

 11000 lbf48700 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 1890 lbf8400 N

Factors

K - Factor7 1.4
e - ISO Factor8 0.42
Y - ISO Factor9 1.44

G1 - Heat Generation Factor (Roller-Raceway)

 15.7

G2 - Heat Generation Factor (Rib-Roller End)

 14.7
Cg - Geometry Factor10 0.0657
  • 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.