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 M249700

Cone Part Number

 N/A M249749

Design Units

 N/A Imperial

Cage Type

 N/A Stamped Steel
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1 N/A 358000 lbf1590000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2 N/A 92800 lbf413000 N

Dimensions

d - Cone Bore

 N/A 10 in254 mm

B - Cone Width

 N/A 2.8125 in71.438 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius3 N/A 0.14 in3.600 mm

da - Cone Frontface Backing Diameter

 N/A 10.63 in270 mm

db - Cone Backface Backing Diameter

 N/A 10.79 in274 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.17 in4.3 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.28 in7.1 mm
a - Effective Center Location4 N/A -0.27 in-6.9 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)5 N/A 53300 lbf237000 N
C1 - Dynamic Radial Rating (1 million revolutions)6 N/A 206000 lbf914000 N

C0 - Static Radial Rating

 N/A 416000 lbf1850000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 30300 lbf135000 N

Factors

K - Factor8 N/A 1.76

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 1626

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 173
Cg - Geometry Factor9 N/A 0.153
  • 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.