Bearings cannot be used if they have the following defects:

① There are cracks or gaps in any of the inner ring, outer ring, rolling body and cage;

② There is a break on any of the ferrule and rolling element;

③ The raceway surface, ribs, and rolling elements have obvious jams;

④ The cage is significantly worn or the rivets are significantly loose;

⑤ There is rust and injury on the raceway surface and rolling elements;

⑥ There are severe indentations and scratches on the raceway surface and rolling elements;