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

A Which standard is used for the inspection of NSK bearing products;

B. What are the inspection items of NSK bearing products;

C What preparations need to be made before NSK bearing products undergo quality inspection;

D The various inspection items of NSK bearing products are tested under what conditions, what methods are used, and what instruments are used for inspection, and what tolerance ranges must the inspection results be considered qualified;

E NSK bearing products are sometimes in large quantities, and it is impossible to inspect 100%. What kind of sampling plan and how many quantities should be selected for inspection can represent the quality of all commodity bearings to a greater extent, and the results of the inspection are based on What criteria should be measured to determine whether this batch of goods is a qualified batch that should be accepted or an unqualified batch that should be rejected.