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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

 LM48500

Cone Part Number

 LM48548A

Cup Part Number

 LM48510

Design Unit

 Inch

Cage Material

 Stamped Steel

Dimensions

d - Bore

 1 3/8 in34.925 mm

D - Cup Outer Diameter

 2.5625 in65.088 mm

B - Cone Width

 0.7200 in18.288 mm

C - Cup Width

 0.5500 in13.970 mm

T - Bearing Width

 0.71 in18.034 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 0.03 in0.800 mm
r - Cup Backface "To Clear" Radius2 0.050 in1.27 mm

da - Cone Frontface Backing Diameter

 1.65 in42 mm

db - Cone Backface Backing Diameter

 1.65 in42 mm

Da - Cup Frontface Backing Diameter

 2.44 in61.00 mm

Db - Cup Backface Backing Diameter

 2.28 in57.91 mm

Ab - Cage-Cone Frontface Clearance

 0.08 in2 mm

Aa - Cage-Cone Backface Clearance

 0.01 in0.3 mm
a - Effective Center Location3 -0.14 in-3.6 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 3760 lbf16700 N
C1 - Dynamic Radial Rating (1 million revolutions)5 14500 lbf64600 N

C0 - Static Radial Rating

 14200 lbf63100 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 2430 lbf10800 N

Factors

K - Factor7 1.55
e - ISO Factor8 0.38
Y - ISO Factor9 1.59
Cg - Geometry Factor10 0.0666
  • 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.