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 745

Cone Part Number

 N/A 740

Cup Part Number

 N/A 742A

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Dimensions

d - Bore

 N/A 3 3/16 in80.963 mm

D - Cup Outer Diameter

 N/A 5.9045 in149.974 mm

B - Cone Width

 N/A 1.8375 in46.673 mm

C - Cup Width

 N/A 1.4375 in36.513 mm

T - Bearing Width

 N/A 1.7502 in44.455 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.200 in5.1 mm
r - Cup Backface "To Clear" Radius2 N/A 0.130 in3.30 mm

da - Cone Frontface Backing Diameter

 N/A 3.58 in91 mm

db - Cone Backface Backing Diameter

 N/A 3.98 in101 mm

Da - Cup Frontface Backing Diameter

 N/A 5.63 in142.00 mm

Db - Cup Backface Backing Diameter

 N/A 5.28 in134.11 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.08 in2 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.05 in1.3 mm
a - Effective Center Location3 N/A -0.47 in-11.9 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 21900 lbf97600 N
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 84700 lbf377000 N

C0 - Static Radial Rating

 N/A 93800 lbf417000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 12200 lbf54400 N

Factors

K - Factor7 N/A 1.8
e - ISO Factor8 N/A 0.33
Y - ISO Factor9 N/A 1.84

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 159.6

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 26.3
Cg - Geometry Factor10 N/A 0.0898
  • 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.