The Timken Company
The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.com
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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

 N/A 32004X

Cone Part Number

 N/A X32004X

Cup Part Number

 N/A YAA32004X

Design Unit

 N/A Metric

Cage Material

 N/A Stamped Steel

Dimensions

d - Bore

 N/A 20 mm0.7874 in

D - Cup Outer Diameter

 N/A 42 mm1.6535 in

B - Cone Width

 N/A 15.000 mm0.5906 in

C - Cup Width

 N/A 12.000 mm0.4724 in

T - Bearing Width

 N/A 15.000 mm0.5906 in

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.640 mm0.03 in
r - Cup Backface "To Clear" Radius2 N/A 1.02 mm0.04 in

da - Cone Frontface Backing Diameter

 N/A 25.5 mm1 in

db - Cone Backface Backing Diameter

 N/A 26.5 mm1.04 in

Da - Cup Frontface Backing Diameter

 N/A 40.39 mm1.59 in

Db - Cup Backface Backing Diameter

 N/A 36.58 mm1.44 in

Ab - Cage-Cone Frontface Clearance

 N/A 2 mm0.08 in

Aa - Cage-Cone Backface Clearance

 N/A -0.3 mm-0.01 in
a - Effective Center Location3 N/A -4.6 mm-0.18 in

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 8520 N1920 lbf
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 32900 N7390 lbf

C0 - Static Radial Rating

 N/A 29400 N6600 lbf
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 5460 N1230 lbf

Factors

K - Factor7 N/A 1.56
e - ISO Factor8 N/A 0.37
Y - ISO Factor9 N/A 1.6

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 6.2

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 6.1
Cg - Geometry Factor10 N/A 0.0469
  • 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.