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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

575

Cone Part Number

580

Design Units

Imperial

Cage Type

Stamped Steel
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1 80900 lbf360000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2 21000 lbf93400 N

Dimensions

d - Cone Bore

3 1/4 in82.550 mm

B - Cone Width

1.4212 in36.098 mm

Abutment and Fillet Dimensions

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

da - Cone Frontface Backing Diameter

3.58 in91 mm

db - Cone Backface Backing Diameter

3.86 in98 mm

Ab - Cage-Cone Frontface Clearance

0.1 in2.5 mm

Aa - Cage-Cone Backface Clearance

0.12 in3 mm
a - Effective Center Location4 -0.21 in-5.3 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)5 12100 lbf53600 N
C1 - Dynamic Radial Rating (1 million revolutions)6 46500 lbf207000 N

C0 - Static Radial Rating

65400 lbf291000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)7 8330 lbf37100 N

Factors

K - Factor8 1.45

G1 - Heat Generation Factor (Roller-Raceway)

126

G2 - Heat Generation Factor (Rib-Roller End)

32
Cg - Geometry Factor9 0.13
  • 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.