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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

 44000

Cone Part Number

 44126

Cup Part Number

 44348

Design Unit

 Inch

Cage Material

 Stamped Steel

Dimensions

d - Bore

 1 1/4 in31.750 mm

D - Cup Outer Diameter

 3.4843 in88.501 mm

B - Cone Width

 0.9330 in23.698 mm

C - Cup Width

 0.6875 in17.463 mm

T - Bearing Width

 1.0000 in25.400 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 0.06 in1.5 mm
r - Cup Backface "To Clear" Radius2 0.06 in1.52 mm

da - Cone Frontface Backing Diameter

 1.83 in46.5 mm

db - Cone Backface Backing Diameter

 1.93 in49 mm

Da - Cup Frontface Backing Diameter

 3.34 in84.10 mm

Db - Cup Backface Backing Diameter

 2.95 in74.93 mm

Ab - Cage-Cone Frontface Clearance

 0.15 in3.8 mm

Aa - Cage-Cone Backface Clearance

 0.12 in3 mm
a - Effective Center Location3 0.09 in2.3 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 4910 lbf21800 N
C1 - Dynamic Radial Rating (1 million revolutions)5 18900 lbf84200 N

C0 - Static Radial Rating

 19900 lbf88600 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 6560 lbf29200 N

Factors

K - Factor7 0.75
e - ISO Factor8 0.78
Y - ISO Factor9 0.77

G1 - Heat Generation Factor (Roller-Raceway)

 22.9

G2 - Heat Generation Factor (Rib-Roller End)

 8.7
Cg - Geometry Factor10 0.0899
  • 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.