Accuracy: Calculated in um, the tolerance is smaller according to /GB308-89 and the American ANSI/AFBMA steel ball standard deviation
Hardness: 58-65 degrees
These bearing balls are installed between the inner ring and the outer ring to reduce friction when the bearing rotates. It can strength the protection to machine and extend the service life.[Applications]: It can be used in humid environments. Suitable for auto parts, bicycles, valves, refrigerators, air conditioners, bearings, photographic equipment, drawer slides and many other applications.