3, is there any noise? Hold the inner sleeve of the bea […]
3, is there any noise?
Hold the inner sleeve of the bearing with your left hand, and rotate the outer sleeve with a small amount of the right hand to make it rotate, and listen to the noise during the operation of the bearing. Due to the backward production conditions of most counterfeit products, it is completely hand-worked. In the production process, the bearing body will inevitably be mixed with impurities such as dust and sand. Therefore, when the bearing rotates, there will be noise or unsmooth operation. . This is the key to judging whether the product comes from a brand-name product of a regular manufacturer that is strict in production standards and operated by machines.
4, the surface
Whether there are turbid oil marks on the surface requires special attention when purchasing imported bearings. Since the domestic anti-rust technology has a certain gap with the foreign advanced manufacturing countries, it is easy to leave a thick oil trace when the bearing body is rust-proof, and it feels sticky and sticky when touched by hands, and foreign original There is almost no trace of rust preventive oil on the imported bearings. According to industry insiders, particularly attentive people can smell a special taste on imported bearings, which is the taste of rust-proof oil.
5, whether the chamfer is uniform
The so-called chamfering of the bearing, that is, the intersection of the horizontal and vertical faces, the counterfeit bearing products are handled unsatisfactorily at the corners of these corners due to the limitation of production technology, which we can easily distinguish.