When using bearings, we should first check the appearance of bearings to judge whether they meet the standards we require.

1) All kinds of cracks, such as raw material cracks, forging cracks, heat treatment cracks and grinding cracks, etc. will expand rapidly in the future operation of the bearing, resulting in bearing fracture, which has a great impact on bearing life and work safety.

(2) all kinds of mechanical scars, such as abrasion, scratch, compression and bump, will cause poor bearing installation, cause partial load and stress concentration, resulting in the decline of rotation accuracy and service life

(3) rust, black skin and pitting, the latter two are easy to store water and dirt defects, the most easy to develop into rust.And corrosion is the source of bad installation, early wear and fatigue, serious corrosion will make the bearing scrap.

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(4) peeling and folding, the local combination of these two defects with the matrix metal is not strong, and the surrounding often exists in varying degrees of decarburization or carbon poverty phenomenon, material easy to collapse, pressure concave or wear, is very bad for bearing life and accuracy.

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(5) maintains a riveting or welding quality, mainly to see whether it has offset the rivet head, skew, relaxation, lack of meat, or "double eyelid, correct the position of the welding, solder joint is too big or too small, for welding not firm or excessive cause jam phenomenon, roller pressure slope, as some cage, caulking and chisel mouth whether the quality assurance,Whether the rolling element can not fall out of the cage and can turn freely. If these points are not required, the bearing noise and rotation accuracy may be reduced at the least, and the cage may fall apart at the largest, resulting in mechanical failure or accident.

If found during the above inspection, the bearing should not be accepted.In addition, such as typing quality is not good, such as vague handwriting, damage, should be considered defective, serious can also not accept.Furthermore, the bearing assembly surface shall not have visible burns (annealing marks).