There is a great difference between refurbished bearings and unused bearings. Today, I will share with you the difference between refurbished bearings and good bearings, and how to identify whether the bearings are old bearings after refurbishment when buying bearings.

1. The size of the bearing after refurbishment has changed. The outer diameter is small and the inner diameter is large, which can be measured by the ruler.

2. Watch the accuracy of the bearing surface and whether it is smooth. Refurbished bearing rough.

3. The rotation of the refurbished bearing is not uniform by hand.

4. Watch the reconditioning bearing clearance between the cage and the rolling body is greater than the normal clearance.

5. Look at the bead size of the bead refurbishment bearing and there will be wear and deformation.

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

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 chamfering size is uneven, and some still have black leather and pitting.

2. The materials used in some inferior bearings are ordinary steel, carbon steel, malleable steel and iron pipe, etc., and the appearance color of these materials is mostly white, and the color of special bearing steel is green. But just look at the color can not be completely determined to do hardness. Ordinary steel has low hardness.

3. Some small manufacturers have simple quenching technology, uneven heating of bearings, and slight deformation.

4. Turn the bearing to see whether the bearing rotates evenly and whether the sound is continuous without noise.

5, look at the cage, the regular manufacturer bearing cage is structured without burr, rivet bearing cage rivet pier head size is consistent, and the irregular manufacturer processing technology and equipment is simple, so the cage is rough, some riveting structure cage is evenly divided with or offset, rivet pier head size is different or riveting.

6, look at the packaging, the regular manufacturer packaging is consistent, the font on the packaging is clear, some counterfeit bearing packaging is not consistent, or simple and irregular.

7. Look at the bearing face font, the original bearing whether steel word or laser font is very clear and uniform, the laser font has a certain depth, the counterfeit bearing font has broken marks, the laser font is not wiped lightly with gauze, and the normal laser font will leave vague font traces after being wiped with gauze.

8, look at the certificate, the normal manufacturer bearing certificate and certificate size is the same, most certificate paper for grease-proof paper. The font is clear, some manufacturers have query information on the certificate, counterfeit certificate, some fuzzy font, paper for ordinary paper, certificate size. It is suggested to have the standard manufacturer certificate for comparison and reference.

9, some imported bearings in the anti-rust oil and domestic difference, imported bearings are not no anti-rust agent but can not see the trace of the bearing surface is clear, and some counterfeit imported bearings coated with domestic anti-rust agent in the hand feel sticky, will taste a smell of anti-rust oil.

10. Understand and understand the bearing typing specifications of normal products of some normal manufacturers, such as bearing model, trademark and year code. And some false bearing fonts are engraved, even if some of the fonts are blurred by laser.

11. If conditions permit, it is best to visit bearing manufacturers or brand dealers in person.

If you have any questions,pls feel free to contact us.

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