The Timken Company
The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.com
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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

Cone Part Number

 N/A 78225

Bore (d)

 N/A 2 1/4 in57.150 mm

Inner Ring Width (B)

 N/A 1.3085 in33.236 mm
Dynamic Radial Load Rating - 1M Revs (C1) 1 N/A 45600 lbf203000 N
Dynamic Radial Load Rating - 90M Revs (C90) 2 N/A 11800 lbf52600 N
K Factor 3 N/A 0.67

Other Dimensions

Weight

 N/A 11.68 lb5.3 Kg
Effective Center Location4 N/A 0.31 in7.9 mm
Max Shaft Fillet Radius5 N/A 0.14 in3.600 mm

Shaft Backing Shoulder Diameter - Frontface (da)

 N/A 3.03 in77 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 3.27 in83 mm

Cage Location rel. to BF (Aa)

 N/A 0.24 in6.1 mm

Cage Location rel. to FF (Ab)

 N/A 0.2 in5.1 mm

Ratings

Dynamic Axial Rating - 90M Revs (Ca90)6 N/A 17500 lbf77900 N

Static Radial Load Rating (CO)

 N/A 43400 lbf193000 N

Factors

G1 Factor

 N/A 62.6

G2 Factor

 N/A 19.1
Geometry Factor (Cg)7 N/A 0.0884
  • 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.
  • 3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 4 Negative value indicates effective center inside cone backface.
  • 5 These maximum fillet radii will be cleared by the bearing corners.
  • 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 Geometry constant for Lubrication Life Adjustment Factor a3l.