Double row tapered roller bearings

Identify equipment bearing quality, we usually from the following aspects:
The packaging is clear
Under normal circumstances, the regular manufacturers brand has its own dedicated designer of external packaging design, production conditions and arrangements for making the production of the factory clearance, so in terms of product packaging lines to color should be very clear, milli unambiguous.
Seal word is clear
Every product bearing the body will be in products lysn-bearing the words printed on its brand, label and so on. Although the font is very small, but regular manufacturers of products using the stamp printing technology, but without the heat-treatment is carried out before the word pressure, so the font was small, but a deep concave, very clear. The general case, not only blurred fonts counterfeit products, the printing technique rough, font floating on the surface, and some can be easily wiped off by hand or manually trace serious.
Is there a hybrid ring
Left hand holding the bearing body sets forth the right hand toggle coat small amplitude rotated, listening bearings during operation if there is a hybrid ring. As most of the counterfeit products behind the production conditions, completely hand-workshop-type operation, backing bearings the body in the production process will inevitably be distracted by dust, sand a kind of impurity, so that rotation of the bearing will appear when the hybrid ring or the phenomenon does not run smoothly . This is to determine whether the product by strict production standards, and with the regular operation of the machine manufacturer's brand product key.
Surface
Are there traces of oil muddy surface which requires us to buy imported bearings should pay special attention. As the domestic and foreign advanced technology manufacturing rust country there is a gap, so the bearing body rust treatment can easily leave traces of oil thick, sticky feeling when touch the sticky thick, while the foreign original imported bearings hardly see any rust oil traces. According to insiders, particularly careful people can smell the bearings a special flavor, the taste of which is anti-rust oil