Life - Load and Speed (rpm) Formulas
To calculate the theoretical L10 life in hours while including application dynamic loading, application speeds(rpm) and defined catalog load capacities(C) use the following industry standard formula.



C = dynamic rating in catalog
P = application applied load
S = application speed in RPM
L₁₀ = theoretical bearing L₁₀ life in hours

ABMA-Industry Radial Caacity Formula
Dynamic load ratings in catalog (Cr) are derived using the following Industry standard ABMA listed formula.




Where:

Cr  = basic radial dynamic load rating
fcm  = factor for material, geometry,
         tolerance, quality, and race finish
Dw = ball diameter in inches
z  =  number of balss per row
i   =  number of rows of balls
= nominal contact angle of the bearing
      in degrees.