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 31320X

Cone Part Number

 N/A X31320XM

Cup Part Number

 N/A Y31320XM

Design Unit

 N/A Metric

Cage Material

 N/A Stamped Steel

Related Assembly Number(s)

 N/A 31320XM-90KA2

Dimensions

d - Bore

 N/A 100 mm3.937 in

D - Cup Outer Diameter

 N/A 215 mm8.4646 in

B - Cone Width

 N/A 51 mm2.0079 in

C - Cup Width

 N/A 35 mm1.378 in

T - Bearing Width

 N/A 56.5 mm2.2244 in

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 4 mm0.157 in
r - Cup Backface "To Clear" Radius2 N/A 3 mm0.12 in

da - Cone Frontface Backing Diameter

 N/A 122.9 mm4.84 in

db - Cone Backface Backing Diameter

 N/A 144 mm5.67 in

Da - Cup Frontface Backing Diameter

 N/A 202 mm7.95 in

Db - Cup Backface Backing Diameter

 N/A 183.9 mm7.24 in

Ab - Cage-Cone Frontface Clearance

 N/A 8.6 mm0.34 in

Aa - Cage-Cone Backface Clearance

 N/A 9.7 mm0.38 in
a - Effective Center Location3 N/A 11.4 mm0.45 in

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 114000 N25700 lbf
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 441000 N99100 lbf

C0 - Static Radial Rating

 N/A 526000 N118000 lbf
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 161000 N36300 lbf

Factors

K - Factor7 N/A 0.71
e - ISO Factor8 N/A 0.83
Y - ISO Factor9 N/A 0.73

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 196.1

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 30.1
Cg - Geometry Factor10 N/A 0.12
  • 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.