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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

 N/A 3900

Cone Part Number

 N/A K3982

Design Units

 N/A Imperial

Cage Type

 N/A Stamped Steel
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1 N/A 64400 lbf286000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2 N/A 16700 lbf74300 N

Dimensions

d - Cone Bore

 N/A 2 1/2 in63.500 mm

B - Cone Width

 N/A 1.1830 in30.048 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 2.8 in71 mm

db - Cone Backface Backing Diameter

 N/A 3.03 in77 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.08 in2 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.06 in1.5 mm
a - Effective Center Location4 N/A -0.18 in-4.6 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)5 N/A 9590 lbf42700 N
C1 - Dynamic Radial Rating (1 million revolutions)6 N/A 37000 lbf165000 N

C0 - Static Radial Rating

 N/A 43000 lbf191000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 6600 lbf29400 N

Factors

K - Factor8 N/A 1.45
Cg - Geometry Factor9 N/A 0.109
  • 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.
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