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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.
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Unit of Measure

Key Dimensions

Series

 N/A 395

Cone Part Number

 N/A 399A

Cup Part Number

 N/A 394AS

Bore (d)

 N/A 2.6875 in68.263 mm

O.D. (D)

 N/A 4.3307 in110 mm

Design Unit

 N/A Inch

Width (T)

 N/A 0.8661 in21.999 mm
Dynamic Radial Load Rating - 90M Revs (C90) 1 N/A 5760 lbf25600 N
Dynamic Radial Load Rating - 1M Revs (C1) 2 N/A 22200 lbf98900 N

Static Radial Load Rating (C0)

 N/A 28100 lbf125000 N
K Factor 3 N/A 1.45
e Factor 4 N/A 0.4
Y Factor 5 N/A 1.49

Cage Material

 N/A Stamped Steel

Other Dimensions

Inner Ring Width (B)

 N/A 0.866 in21.996 mm

Outer Ring Width (C)

 N/A 0.7411 in18.824 mm

T1 - Total Width

 N/A 0.9141 in23.218 mm
Max Shaft Fillet Radius6 N/A 0.09 in2.3 mm
Max Housing Fillet Radius7 N/A 0.13 in3.3 mm

Shaft Backing Shoulder Diameter - Frontface (da)

 N/A 2.91 in74 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 3.07 in78 mm

Housing Backing Shoulder Diameter - Frontface (Da)

 N/A 4.15 in105.4 mm

Housing Backing Shoulder Diameter - Backface (Db)

 N/A 3.9 in99.06 mm

Cage Location Relative to Frontface (Ab) 

 N/A 0.11 in2.8 mm

Cage Location Relative to Backface (Aa)

 N/A 0.05 in1.3 mm
Effective Center Location8 N/A -0.03 in-0.8 mm

Ratings

Ca90 - Dynamic Thrust Rating (90 million revolutions)9 N/A 3970 lbf17600 N

Factors

Y1 Factor 10 N/A 1.68
Y2 Factor 11 N/A 2.5

G1 Factor

 N/A 56

G2 Factor

 N/A 21.4
Geometry Factor (Cg)12 N/A 0.0984
  • 1 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 2 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 4 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 5 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 6 These maximum fillet radii will be cleared by the bearing corners.
  • 7 These maximum fillet radii will be cleared by the bearing corners.
  • 8 Negative value indicates effective center inside cone backface.
  • 9 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.
  • 10 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 11 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 12 Geometry constant for Lubrication Life Adjustment Factor a3l.