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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

 HM89400

Cone Part Number

 HM89440

Cup Part Number

 HM89411

Design Unit

 Inch

Cage Material

 Stamped Steel

Dimensions

d - Bore

 1 1/4 in31.750 mm

D - Cup Outer Diameter

 3 in76.2 mm

B - Cone Width

 1.1250 in28.575 mm

C - Cup Width

 0.9063 in23.020 mm

T - Bearing Width

 1.1563 in29.370 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 0.03 in0.800 mm
r - Cup Backface "To Clear" Radius2 0.030 in0.76 mm

da - Cone Frontface Backing Diameter

 1.75 in44.5 mm

db - Cone Backface Backing Diameter

 1.79 in45.5 mm

Da - Cup Frontface Backing Diameter

 2.91 in73.90 mm

Db - Cup Backface Backing Diameter

 2.56 in65.02 mm

Ab - Cage-Cone Frontface Clearance

 0.08 in2 mm

Aa - Cage-Cone Backface Clearance

 0.06 in1.5 mm
a - Effective Center Location3 -0.22 in-5.6 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 6440 lbf28600 N
C1 - Dynamic Radial Rating (1 million revolutions)5 24800 lbf110000 N

C0 - Static Radial Rating

 26700 lbf119000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 6020 lbf26800 N

Factors

K - Factor7 1.07
e - ISO Factor8 0.55
Y - ISO Factor9 1.1
Cg - Geometry Factor10 0.0883
  • 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.