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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Unit of Measure

Key Dimensions

Cone Part Number

 N/A NA780

Cup Part Number

 N/A 774CD

Design Unit

 N/A Inch

Bore (d)

 N/A 4 in101.6 mm

O.D. (D)

 N/A 7.125 in180.975 mm
Dynamic Radial Load Rating - 90M Revs (C90) 1 N/A 20200 lbf89700 N
Dynamic Radial Load Rating 2-Row - 90M Revs (C90-2row)2 N/A 35100 lbf156000 N
K Factor 3 N/A 1.51
e Factor 4 N/A 0.39

Other Dimensions

T - Bearing Width across Cones

 N/A 4.125 in104.775 mm
Max Shaft Fillet Radius5 N/A 0.14 in3.5 mm
Max Housing Fillet Radius6 N/A 0.06 in1.5 mm

Outer Ring Width (C)

 N/A 3.375 in85.725 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 4.69 in119 mm

Housing Backing Shoulder Diameter - Frontface (Da)

 N/A 6.65 in168.9 mm

Ka

 N/A 0.75 in19.05 mm

Kb

 N/A 0.28 in7.13 mm

Weight

 N/A 23.43 lb10.62 Kg

Ratings

C1 - Dynamic Radial Rating (1 million revolutions)7 N/A 135000 lbf603000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)8 N/A 13300 lbf59200 N

Factors

Y1 Factor 9 N/A 1.75
Y2 Factor 10 N/A 2.61
  • 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 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 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 maximum fillet radii will be cleared by the bearing corners.
  • 6 These maximum fillet radii will be cleared by the bearing corners.
  • 7 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 8 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.
  • 9 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 10 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.