Montage of Timken Bearing Products
Batch CAD Cart (0) ▾
  • Cart is empty
  1. Click Here for Batch Download
Request Information Add to CAD Cart
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

 N/A LM921800

Cone Part Number

 N/A LM921845

Cup Part Number

 N/A LM921810

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Dimensions

d - Bore

 N/A 4 in101.600 mm

D - Cup Outer Diameter

 N/A 7.0000 in177.800 mm

B - Cone Width

 N/A 1.2500 in31.750 mm

C - Cup Width

 N/A 0.7500 in19.050 mm

T - Bearing Width

 N/A 1.375 in34.925 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.13 in3.300 mm
r - Cup Backface "To Clear" Radius2 N/A 0.130 in3.30 mm

da - Cone Frontface Backing Diameter

 N/A 4.69 in119 mm

db - Cone Backface Backing Diameter

 N/A 5.04 in128 mm

Da - Cup Frontface Backing Diameter

 N/A 6.81 in172 mm

Db - Cup Backface Backing Diameter

 N/A 6.06 in153.92 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.16 in4.1 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.33 in8.4 mm
a - Effective Center Location3 N/A 1.36 in34.5 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 9930 lbf44200 N
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 38300 lbf170000 N

C0 - Static Radial Rating

 N/A 49200 lbf219000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 19900 lbf88600 N

Factors

K - Factor7 N/A 0.5
e - ISO Factor8 N/A 1.17
Y - ISO Factor9 N/A 0.51

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 114

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 37.4
Cg - Geometry Factor10 N/A 0.115
  • 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.