The bearing can not be used because of these phenomena

If the bearing has the following defects, it can no longer be used:

① There are cracks or notches on any one of the inner ring, outer ring, rolling element or cage;

② Any one of ferrule and rolling element is broken;

③ There are obvious damage on raceway surface, rib and rolling element;

④ The cage was worn significantly or the studs were loose significantly;

⑤ Rust and damage on raceway surface and rolling element;

⑥ The raceway surface and rolling element have serious indentation and mark;

⑦ The inner warp surface of the inner ring and the outer warp surface of the outer ring have obvious creep;

⑧ The discoloration caused by heat is obvious;

⑨ The bearing sealed with grease, sealing ring or dust cover are obviously damaged.