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 31318M

Cup Part Number

 N/A Y31318M

Design Units

 N/A METRIC

Full Timken Part Number

 N/A 31318

Dimensions

D - Cup Outer Diameter

 N/A 190 mm7.4803 in

C - Cup Width

 N/A 30 mm1.1811 in

Abutment and Fillet Dimensions

r - Cup Backface "To Clear" Radius1 N/A 3.05 mm0.12 in

Da - Cup Frontface Backing Diameter

 N/A 182.12 mm7.17 in

Db - Cup Backface Backing Diameter

 N/A 164.08 mm6.46 in

Factors

K - Factor2 N/A 0.71
e - ISO Factor3 N/A 0.83
Y - ISO Factor4 N/A 0.73

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 169.3

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 37.1
Cg - Geometry Factor5 N/A 0.114
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 4 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 5 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.