One, the outer packing is clear: in general, are factory brand has its own professional design external packaging design, and arrange production with the conditions of the factory production, so no matter from packaging lines and colors are very clear, unambiguous, (partial import brand accessories packaging and specifically to protect their intellectual property unique design). 

Ii. Whether the steel print is clear: brand words and label will be printed on the bearing body.Most of the products are made of steel, and are pressed before they are overheated, so the font is small, but deep and clear.The typefaces of counterfeit products are not only blurry, they float on the surface due to the rough printing technique, and some can even be easily wiped off by hand. 

Three, whether there is noise: the left hand holding the bearing body sleeve, the right hand dial coat to make it rotation, listen to whether there is noise.Due to the backward production conditions of most counterfeit products, complete manual workshop operation, in the production process will inevitably be mixed with sand impurities, hidden in the body of the bearing, so it will send out noise when rotating.This is the biggest difference between factory brands that strictly adhere to production standards and operate with machines. 

Four, whether the surface has the muddy oil mark: this should pay special attention when buying the import bearing.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. 

Five, whether the chamfer is uniform: the so-called bearing chamfer, that is, horizontal surface and vertical surface of the intersection, the imitation of the bearing due to the limitations of production technology, in these corners of the position is not satisfactory.