What knowledge do I need to know for inspection and acceptance of NSK bearings?

To check NSK bearings, users must have the following knowledge:

(1) Which standard is used for the inspection of NSK bearing products;

(2) What are the inspection items of NSK bearing products, and why should they be inspected?

(3) What preparations need to be made before NSK bearing products undergo quality inspection, and why are these preparations required;

(4) Under what conditions, what methods and instruments are used to inspect the various inspection items of NSK bearing products, and what tolerance ranges must the inspection results be considered qualified;

(5) NSK bearing products are sometimes in large quantities, and it is impossible to carry out 100% inspection. So what kind of sampling plan and how many samples should be selected for inspection can more comprehensively and reliably represent the quality of all commodity bearings. The results of the inspection are measured according to what standard to determine whether this batch of goods is a qualified batch that should be accepted or an unqualified batch that should be rejected.