The first thing to judge is whether the bearing outer packaging is clear: whether the self-lubricating steel sleeve packaging is clear. Under normal circumstances, the factory oil-free bearing factory brand has its own special designer to design the outer packaging, and carefully observe it. It can be identified and arranged for production and production at the factory where the production conditions are passed, so the packaging is very clear and unambiguous from line to color. Some manufacturers also have some special bimetal bearing identifiers, so pay attention to
Then listen to the bearing for noise, hold the inner sleeve of the bearing, and turn the outer sleeve to rotate to hear if there is any noise. This is the biggest difference from the standard factory brand bearing and machine operated. Most of the counterfeit products are out of production conditions, and they are completely hand-worked. In the production process, impurities such as sand are inevitably incorporated into the bearing body, so they will make noise when rotating. The next step is to see if there are turbid oil marks on the surface. Pay special attention when buying bearings.
At present, the domestic anti-rust technology is not mature enough, so it is easy to leave a thick oil trace when the bearing body is rust-proof, and the original imported bearings can hardly see the traces of anti-rust oil. If you are a expert, Smell the smell of the bearing, you can also smell the anti-rust oil, just can't see it. Finally, see if the chamfer is even, that is, the intersection of the horizontal and the vertical. The counterfeit bearing has no high-tech equipment due to the limitation of production technology, so it will be treated poorly at these corners. It is not difficult to see.
Then check whether the steel stamp is clear, and the brand name, label, etc. will be printed on the bearing body. The font is very small, but most of the products produced by the factory use the stamping technology, and the type is pressed before the heat treatment, so the font is small, but it is concave-deep and very clear. If it is a counterfeit product, its font is very vague, because the printing technique is rough, the font floats on the surface, and some can even be easily wiped off with a wet cloth or hand.
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