Has the bearing been refurbished? Differences and identifica

1. Refurbished bearings are generally limited by the technology and equipment of small bearing manufacturers, so the bearing precision is low, the bearing surface is rough, the chamfer size is not uniform, and some of them still have black skin and pitting.

2. Some inferior bearing materials are ordinary steel, carbon steel, malleable steel and iron pipes, etc., and most of these materials are white in appearance, while the color of special bearing steel is green.But color alone can not be completely determined to do hardness.Ordinary steel has low hardness.

3, some small manufacturers quenching technology is simple, bearing heat unevenly, there will be slight deformation.

4, rotate the bearing, see whether the bearing rotation is uniform, whether the sound is continuous without noise.

5, look at the retainer, regular manufacturers bearing retainer neat, riveting bearing retainer rivet pier head size is the same, and irregular manufacturers processing technology and equipment is simple, so the retainer rough, some riveting structure retainer unequal and or on the side, rivet pier head size or riveting.

6, look at the packaging, regular manufacturers consistent packaging, packaging font is clear, some imitation bearing packaging inconsistent, or crude and irregular.

7, look at the bearing end face font, the original bearing whether steel or laser font is very clear and uniform, laser font has a certain depth, bearing imitation has broken mark, laser font with gauze gently wiped away, and the normal laser font with gauze after a wipe will leave a faint trace of font.

8. Look for the certificate. The bearings of normal manufacturers have the certificate and the size of the certificate is the same.Font is clear, some manufacturer certificate has query information, counterfeit certificate, some font is fuzzy, paper is ordinary paper, certificate size is different.It is suggested that regular manufacturer certificate be left for comparative reference.

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

10, understand and understand some normal manufacturers of normal products in the bearing typing specifications, such as: bearing model, trademark, year code.And some of the fake bearing fonts are engraved, even if the laser makes some of the font blurred.

11, if the conditions are best to bearing manufacturers or brand dealers in person.