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 129000

Cone Part Number

 N/A EE129120X

Design Units

 N/A Imperial

Cage Type

 N/A Stamped Steel
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1 N/A 351000 lbf1560000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2 N/A 91000 lbf405000 N

Dimensions

d - Cone Bore

 N/A 12 in304.8 mm

B - Cone Width

 N/A 3.0312 in76.992 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius3 N/A 0.25 in6.4 mm

da - Cone Frontface Backing Diameter

 N/A 12.91 in328 mm

db - Cone Backface Backing Diameter

 N/A 13.15 in334 mm

Ab - Cage-Cone Frontface Clearance

 N/A -0.02 in-0.5 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.56 in14.2 mm
a - Effective Center Location4 N/A 0.29 in7.4 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)5 N/A 52200 lbf232000 N
C1 - Dynamic Radial Rating (1 million revolutions)6 N/A 201000 lbf896000 N

C0 - Static Radial Rating

 N/A 401000 lbf1780000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 37200 lbf165000 N

Factors

K - Factor8 N/A 1.4

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 1882.6

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 272.9
Cg - Geometry Factor9 N/A 0.171
  • 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.