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Unit of Measure

Other Dimensions

Weight

 N/A 5.23 Kg11.55 lb

Width (T)

 N/A 2.875 in73.025 mm

B - Width

 N/A 2.6170 in66.472 mm
Max Shaft Fillet Radius1 N/A 0.02 in0.5 mm
Max Housing Fillet Radius2 N/A 0.09 in2.29 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 3.35 in85 mm

Housing Backing Shoulder Diameter - Frontface (Da)

 N/A 5.22 in132.59 mm

Key Dimensions

Cone Part Number

 N/A 78250

Cup Part Number

 N/A 78551

Related Assembly Number(s)

 N/A 78250-90027

Outer Spacer Part Number

 N/A Y2S-78551

Design Unit

 N/A Inch

Bore (d)

 N/A 2.5 in63.5 mm

O.D. (D)

 N/A 5.5130 in140.030 mm
Dynamic Radial Load Rating - 90M Revs (C90) 3 N/A 11800 lbf52600 N
Dynamic Radial Load Rating 2-Row - 90M Revs (C90-2row)4 N/A 20600 lbf91500 N
K Factor 5 N/A 0.67
e Factor 6 N/A 0.87

Ratings

C1 - Dynamic Radial Rating (1 million revolutions)7 N/A 79300 lbf353000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)8 N/A 17500 lbf77900 N

Factors

Y1 Factor 9 N/A 0.78
Y2 Factor 10 N/A 1.16
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 These maximum fillet radii will be cleared by the bearing corners.
  • 3 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 4 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.
  • 5 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 6 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 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.