1, all kinds of mechanical scars, such as abrasion and scratches, crushed, touch injury etc, can create bearing bad installation, cause partial load and stress concentration, cause rotating precision and the service life of decline.

2, rust, black and hemp dot, the latter two are easy to store water and dirt, the defects of the most easy to develop into rust. And corrosion is lead to bad installation, early wear and fatigue pollution, serious corrosion will make bearing damaged.

Three, all kinds of crack, such as raw material crack, forging crack, heat treatment cracks and grinding crack, etc, these cracks in the process of operation after bearing, will become a source of stress concentration and expanded rapidly, causing the bearing is broken, and to bearing life and safety in work great impact. In fact, for important use of bearing, bearing plant about their constituent parts has 100% magnetic or radiographic examination.

3, peeling and fold, the two defects of local and matrix with metal not firm, and its surrounding often exist to varying degrees decarburization or the poor carbon phenomenon, material is easily caving, pressure concave or abrasion, to bearing life and precision is very bad.
 
4, maintains a joint or welding quality, main observation rivets head for deviation, whether askew, relaxation, lack of meat or "double-fold eyelid, the position of the welding 'if it is right or wrong, or is too small, too much solder joints for welding rickety or welding roller phenomenon caused by excessive stuck. Above a few we check in the key check SKF bearing parts, in addition to the above, another part of the check outside such as typing quality not beautiful, such as illegible, damage, should think defective goods, serious also may not be acceptance.



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