Crane Hooks should be scrapped when one of the following conditions occurs:
② dangerous section wear up to 10% of the original size;
③ opening degree than the original size increased by 10%;
④ crane hook body torsion deformation of more than 10 °;
⑤ crane hook dangerous section or crane hook neck plastic deformation;
⑥ crane hook thread is corroded;
⑦ sheet bushing wear 50% of the original size, the replacement of the bushing;
⑧ sheet crane hook mandrel wear up to 5% of the original size, should replace the mandrel.