Menu
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 28900

Cone Part Number

 N/A 28980

Cup Part Number

 N/A 28921

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Related Assembly Number(s)

 N/A 28980-90011

Dimensions

d - Bore

 N/A 2.3613 in59.977 mm

D - Cup Outer Diameter

 N/A 3.937 in100 mm

B - Cone Width

 N/A 1.0000 in25.400 mm

C - Cup Width

 N/A 0.7813 in19.845 mm

T - Bearing Width

 N/A 1.0000 in25.400 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.14 in3.600 mm
r - Cup Backface "To Clear" Radius2 N/A 0.130 in3.30 mm

da - Cone Frontface Backing Diameter

 N/A 2.64 in67 mm

db - Cone Backface Backing Diameter

 N/A 2.87 in73 mm

Da - Cup Frontface Backing Diameter

 N/A 3.82 in97.00 mm

Db - Cup Backface Backing Diameter

 N/A 3.50 in88.90 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.09 in2.3 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.05 in1.3 mm
a - Effective Center Location3 N/A -0.1 in-2.5 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 6180 lbf27500 N
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 23800 lbf106000 N

C0 - Static Radial Rating

 N/A 33500 lbf149000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 4500 lbf20000 N

Factors

K - Factor7 N/A 1.37
e - ISO Factor8 N/A 0.43
Y - ISO Factor9 N/A 1.41

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 60.1

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 24.5
Cg - Geometry Factor10 N/A 0.103
  • 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.
By clicking Submit, you consent to the personal information you provide being used in the manner as described in our Privacy Notice, including access to that information by Timken personnel who may be located outside your home country. In addition, you agree that the CAD drawings are for your personal, one-time use only, and that you will not modify or create any compilation or derivative work using the CAD drawings or distribute or display the CAD drawings on any website or other media.