What kind of methods to identify the quality of bearing are there

What kind of methods to identify the quality of bearing are there? What kind of methods to identify the quality of bearing are there? Introduces for you below five kinds of methods to identify the quality of bearing, which is divided into whether there are miscellaneous ring, outer packing is clear, seal is the word clearly, chamfering whether even, if there is a muddy soil surface. 1) Whether there are miscellaneous ring bearing body with his left hand, right hand toggle coat to make it spin, listen to its hybrid ring. Due to the backward production conditions most of the counterfeit products, fully manual mill operation, in the process of production inevitably mixed into the sand kind of impurity, hidden in the bearing body, so makes a noise when rotating ring. This is and strict production standards, and use machine operation are factory is the biggest difference between brands. 2) The outer packing is clear in general, are factory brand has its own special foreign packaging designers design, and arrange production with the conditions of the factory production, so packaging is very clear, from line to patch unequivocally. （ Some imported brands of accessories and specifically to protect their intellectual property on the package's unique design, the content of this in the future will continue to detail) 。 3) Seal character is clear on the bearing body printed with brand, label, etc. Font is very small, but is produced by the factory are mostly use seal technology, and before without overheating treatment of words, so the font although small, but deep concave, very clear. And counterfeit products font instead of fuzzy, because of printing technology coarse, font float to the surface, in some cases can be easily erased by hand. 4) Chamfer whether even so-called bearing chamfer, also is the horizontal plane and vertical plane junction, counterfeit bearings because of the limitation of production technology in the area of the fringes is handled. 5) Surface whether there is a cloudy oil stains which should pay special attention to when to buy imported bearings. Due to the current domestic antirust technology is not particularly home, so the antirust processing was carried out on the bearing body and is easy to leave the thick oil stains, holding the thick thick, and imported from abroad can hardly see the trace of anti-rust oil bearing, is particularly careful expert said imported bearing smell a smell, must be under the anti-rust oil, just can't see.