The outer packing is clear: usually, bearing assembly with clearance with fault caused by the improper inspection is factory brand has its own special design personnel foreign packaging design, and arrange production conditions of the factory production pass, the overseas import bearing collar production process of four process so packaging no matter from line to color piece are very clear, unambiguous.

Steel word is clear: in bearing body with words, the label will brand, etc. Font is very small, belt tension is adjusted, calibration INA bearing coupling but are mostly use steel product factory technology, but without the overheating in before treatment for pressure word, so font although small, but concave deep, very clear. Fake products not only the font and fuzzy, due to the rough words printed technology, font float at the surface, some even easily can be erased by hand.

If there is miscellaneous ring: left hand holding the bearing of the body, the right hand moving coat rotating, listen to any miscellaneous ring. Since most of the counterfeit products production conditions backward, fully manual mill operation, in the process of production will be hard to avoid mixed into the sand kind of impurities, hidden in bearing body, so in turns out the noise will China's bearing ultra precision equipment production enterprise of the industry situation this is and strictly carry out the production standard, and use machine operation is the biggest difference between the brand.

The surface is a murky waters of the oil stains: NTN bearing lead code and NTN bearing suffix letters mean this in buying entrance bearing should pay special attention. Because domestic current antirust technology is not special home, so for bearing body antirust processing can easily leave thick oil stains, take it on thick sticky stiff, and the foreign original import bearings can hardly see traces of temporary, but special care expert said the import bearings smells like a kind of taste, affirmation is a temporary, just impossible to see.

Chamfering whether uniform: bearing grinding appeared in the process of all kinds of bad situation solutions so-called bearing chamfering, also is the horizontal surface and the vertical junction, counterfeit bearing because the production of technical limitations, in these fringes of parts processing unsatisfactory.



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