Montage of Timken Bearing Products
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 31326M

Cone Part Number

 N/A X31326M

Design Units

 N/A METRIC

Cage Type

 N/A Stamped Steel
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1 N/A 1200000 N270000 lbf
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2 N/A 312000 N70100 lbf

Full Timken Part Number

 N/A 31326

Dimensions

d - Cone Bore

 N/A 130 mm5.1181 in

B - Cone Width

 N/A 66.000 mm2.5984 in

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius3 N/A 5.080 mm0.200 in

da - Cone Frontface Backing Diameter

 N/A 163 mm6.42 in

db - Cone Backface Backing Diameter

 N/A 186 mm7.32 in

Ab - Cage-Cone Frontface Clearance

 N/A 9.4 mm0.37 in

Aa - Cage-Cone Backface Clearance

 N/A 15.7 mm0.62 in
a - Effective Center Location4 N/A 14.7 mm0.58 in

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)5 N/A 179000 N40300 lbf
C1 - Dynamic Radial Rating (1 million revolutions)6 N/A 691000 N155000 lbf

C0 - Static Radial Rating

 N/A 966000 N217000 lbf
Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 253000 N56900 lbf

Factors

K - Factor8 N/A 0.71

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 411.8

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 42.2
Cg - Geometry Factor9 N/A 0.128
  • 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.