Basic Load Rating in our catalog for each bearing is NOT the actual load that our bearings can withstand. Below is an example of how Basic Load Rating converts to actual load.
Light Load- Up to 0.075C (up to 7.5%)
Medium Load- from 0.075C to 0.15C (between 7.5% and 15%)
Heavy Load- Over 0.15C (Over 15%)
C- Basic Load Rating
Cr- Dynamic Load Rating
Cor- Static Load Rating
Example: Bearing B6004ZZ (Cr= 9.4KN, Cor=5.05KN)
Actual Radial Load in Motion (Dynamic):
Light Load < 9.4*0.075< 0.705KN< 705N< 71.9kgf< 158.5lbf
Medium Load= 9.4*0.075~9.4*0.15= 0.705KN~1.41KN= 705N~1410N= 71.9kgf~143.8kgf= 158.5lbf~317lbf
High Load > 9.4*0.15> 1.41KN> 1410N> 143.8kgf> 317lbf
We can see from above calculations that an actual radial load above 317lbf for B6004ZZ bearing is to operate at a high load. The Misumi blog “Ball Bearing Life and Rated Load” will also help determine bearing life span knowing actual radial and axial load.