1. Outer packing and certificate of conformity

a Whether the outer packaging is clear: In general, the original brand has its own special designers to design the outer packaging, and arranges factories with qualified production conditions to produce and produce, so the packaging is very clear from lines to color blocks, without vague.

b Whether the certificate of conformity is standardized

2. Stamped characters

aThe brand name, label, etc. will be printed on the bearing body.

b. Domestic stamped fonts are very small. Most of the original products are laser-etched, and the bearings are embossed before heat treatment. Therefore, although the fonts are small, they are deeply concave and very clear. The fonts of counterfeit products are not only blurred due to the rough printing technology, but the fonts float on the surface, and some of them can even be easily erased by hand.

c General domestic bearings or imitation bearings, steel stamps are protruding or recessed on the surface of the bearing.

3. Overall situation

a Whether there is appearance quality, poor processing quality, obvious circular runout, the bearing belongs to a class of precision mechanical products, and the surface roughness must be below 1.6.

b. Whether there are turbid oil stains. Domestic bearings tend to leave thick oil stains, which are sticky and sticky when held in the hand, and have an obvious smell of anti-rust oil. There are almost no traces of anti-rust oil on the imported bearings.

4. Metallic luster

Whether the bearing is of high quality depends on the level of steel and heat treatment.

a The bearing chamfer is no longer polished after heat treatment. The genuine chamfer is quite smooth and has a gray metallic luster. There are two kinds of defective goods, one is made of domestic bearings with better quality, the chamfer is also very smooth, but the color is not gray metallic luster; the other is fake made of small domestic factory, with chamfered corners Not smooth, there are traces of bumps, not bright.

B bearing steel is divided into six categories: high carbon chromium bearing steel, chromium-free bearing steel, carburized bearing steel, stainless bearing steel, medium and high temperature bearing steel and antimagnetic bearing steel.

●If rust spots are found, there is something wrong with the material.

●If serious collision marks are found, there is a problem with the material.

●If there are balls or rollers of different thickness, the manufacturer will cut corners.

5. Listen to the sound

Hold the inner sleeve of the bearing with your left hand, turn the outer sleeve with your right hand to make it rotate, and listen for any noise. Due to the backward production conditions of most counterfeit products, there will be noise when rotating. Completely manual workshop operation, it is inevitable that impurities such as sand will be mixed into the bearing body during the production process, so it will make noise when rotating. This is the biggest difference from genuine factory brands that strictly enforce production standards and operate with machines.