Montage of Timken Bearing Products
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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

Cone Part Number

 N/A LM377449H

Cup Part Number

 N/A LM377410

Design Unit

 N/A Metric

Related Assembly Number(s)

 N/A LM377449H-902C5 LM377449H-902D7 LM377449H-90WD5 LM377449H-90WD6

Dimensions

d - Bore

 N/A 558.8 mm22 in

D - Cup Outer Diameter

 N/A 736.600 mm29.0000 in

B - Cone Width

 N/A 93 mm3.6614 in

C - Cup Width

 N/A 80.963 mm3.1875 in

T - Bearing Width

 N/A 104.775 mm4.125 in

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 6.4 mm0.25 in
r - Cup Backface "To Clear" Radius2 N/A 6.35 mm0.250 in

db - Cone Backface Backing Diameter

 N/A 594 mm23.39 in

Da - Cup Frontface Backing Diameter

 N/A 710.20 mm27.96 in

Db - Cup Backface Backing Diameter

 N/A 695.96 mm27.40 in

Ab - Cage-Cone Frontface Clearance

 N/A 10.16 mm0.4 in

Aa - Cage-Cone Backface Clearance

 N/A 6.9 mm0.27 in
a - Effective Center Location3 N/A 15.8 mm0.62 in

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 741000 N167000 lbf
Ca90 - Dynamic Thrust Rating (90 million revolutions)5 N/A 439000 N98800 lbf

Factors

K - Factor6 N/A 1.69
e - ISO Factor7 N/A 0.35
Y - ISO Factor8 N/A 1.73
  • 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 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.
  • 6 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 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.