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 31328X

Cone Part Number

 N/A X31328X

Design Units

 N/A METRIC

Cage Type

 N/A Stamped Steel
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1 N/A 1570000 N352000 lbf
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2 N/A 406000 N91300 lbf

Full Timken Part Number

 N/A 31328

Dimensions

d - Cone Bore

 N/A 140 mm5.5118 in

B - Cone Width

 N/A 70 mm2.7559 in

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius3 N/A 5 mm0.2 in

da - Cone Frontface Backing Diameter

 N/A 171 mm6.73 in

db - Cone Backface Backing Diameter

 N/A 199 mm7.83 in

Ab - Cage-Cone Frontface Clearance

 N/A 9.7 mm0.38 in

Aa - Cage-Cone Backface Clearance

 N/A 16.5 mm0.65 in
a - Effective Center Location4 N/A 16.5 mm0.65 in

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)5 N/A 233000 N52500 lbf
C1 - Dynamic Radial Rating (1 million revolutions)6 N/A 900000 N202000 lbf

C0 - Static Radial Rating

 N/A 1020000 N230000 lbf
Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 330000 N74100 lbf

Factors

K - Factor8 N/A 0.71

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 424.5

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 45.2
Cg - Geometry Factor9 N/A 0.129
  • 1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 2 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.
  • 3 These maximum fillet radii will be cleared by the bearing corners.
  • 4 Negative value indicates effective center inside cone backface.
  • 5 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 6 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 7 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.
  • 8 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 9 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.