How do you know that the bearings have been refurbished?


Bearings are common and important parts ,therefore they are extensive using in anical equipment . Some merchants may use the old ones as a good one to sell to customers for making more benifits. Some used or unused old bearings are recycled and used as new bearings after processing. 

There is still a big difference between  refurbished bearings and good bearings,Marginal Bearing shares with you the dthe tips of  how to judge whether the bearings are refurbished bearings when buying bearings.

marginalbearing.png

The difference between them:

1. The size of the refurbished bearing has changed,  outer diameter is small and the inner diameter is large, which can be measured with a ruler.

2. Check the bearing surface accuracy to see if it is smooth. The refurbished bearing is rough.

3.  To take the bearing roll,the refurbished bearing may not rolling uneven.

4. Observe the clearance between the cage and the rolling elements. The clearance of the refurbished bearing is greater than the normal clearance.

5. Depending on the size of the refurbished beads, the bearing beads will be worn and deformed.

6. Look at the slide, the refurbished bearing slide has irregular wear and deformation.


The good methods of judge the Bearing:

1.Refurbished bearings are generally limited by the technology and equipment of small bearing manufacturers, so the bearing accuracy is low, the bearing surface is rough, the chamfer size is uneven, and some have black skin and pitting.

2.Some low-quality bearings are made of ordinary steel, carbon steel, malleable steel, iron pipes, etc., and most of these materials are white in appearance, while special bearing steel is greenish. But just by looking at the color, we cannot completely conclude that we need to do hardness. Ordinary steel has low hardness.

3. Some small manufacturers have simple dipping techniques, and the bearings are heated unevenly and slightly deformed.

4. Rotate the bearing to see if the bearing rotates evenly and the sound is continuous without noise.

5.Checking the cage, the bearing cage of the regular manufacturer is regular and free of burrs. The size of the riveted bearing cage rivet head is the same. The processing technology and equipment of the irregular manufacturer are simple, so the cage is rough, and some riveted structure cages are unevenly divided and or Right, the rivet heads are of different sizes or riveted.

6. Judge from the packaging, the regular manufacturers have the same packaging, the fonts on the packaging are clear, and the packaging of some counterfeit bearings is inconsistent, or simple and irregular.

7. Look at the font on the end face of the bearing. The original bearing is very clear and uniform in both steel and laser fonts. The laser font has a certain depth. The counterfeit bearing font has broken marks. The laser font will disappear with a light wipe with gauze, while the regular laser When the font is wiped with gauze, it will leave blurred traces of the font.

8.Checking the certificate. The bearings of regular manufacturers have certificates and the certificates are the same in size. Most of the certificate papers are greaseproof paper. The font is clear, and some manufacturers have query information on the certificate.

Grid certificate, the font is fuzzy, the paper is ordinary paper, and the size of the certificate varies. It is recommended to keep a regular manufacturer certificate for comparison and reference.


19-Aug-2020