First to determine the bearing outer packing is clear: whether the self-lubrication steel is the set of packaging indicate clearly, in general, without oil bearing factory is factory brand has its own special foreign packaging design, designers carefully observation should be able to tell, and arrange production with the conditions of the factory production, so no matter from packaging lines and colors are very clear, unambiguous.Some manufacturers also have some special bimetal bearing identifiers, so be careful
Then listen to the bearing if there is noise, hold the bearing body sleeve, toggle the coat to rotate, listen to whether there is noise.This is the biggest difference from the standard bearing production and machine operation of the main brand.The production conditions of most counterfeit products are backward and completely manual workshop operation. In the production process, impurities like sand will inevitably be mixed in and hidden in the bearing body, so there will be noise when rotating.The next step is to see if there are any oil stains 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 thick traces of oil on the bearing body during the anti-rust treatment, and almost no traces of anti-rust oil can be seen on the original imported bearing. If you are an expert, you can smell the smell of the bearing and also smell the anti-rust oil, but you just can't see it.Finally, see whether the chamfer is uniform, that is, the intersection of the transverse and vertical, counterfeit bearing due to the limitations of production technology, no high-tech equipment, so will be in these corners of the parts of the processing is very poor, to carefully observe is not difficult to see.
Then to check whether the stencil is clear, bearing body will be printed with brand words, labels, etc.The font is very small, but is produced by the use of steel printing technology, and in the heat treatment before the pressure, so the font is small, but deep, very clear.If it is a fake product, the font is very fuzzy, because the printing technology is rough, fonts float on the surface, some can be easily wiped away with a wet cloth or hand.