Regarding
the accuracy class of the machined ring needle roller bearing,
class-0 is equivalent to bearing of the normal precision
class
and precision becomes progressively higher as the class
number becomes smaller (i.e. Class 6 is less precise than
Class 5 which is less precise than Class 4, and so on).
Bearing of Class-0 are mostly used for general application,
while bearing of Class-4 are used where the requrid running
accuracied and revolutions are high or less friction and
less fluctation are required for bearing.
