The scrapping specification of crane hooks shall be scrapped when the hook appears in one of the following conditions:
Damage section abrasion
10% of the original size;
The opening rate increased by 15% compared with the original size;
(4) a hook type torsional change across 10 °;
Hook damage section or
In the neck of the hanging hook, the model changes.
The hook rib is corrupt;
In the case of 50% of the original size of the hook liner, it should be changed to a bushing;
When the shaft of the hook is worn at 5% of the original size, the spindle should be changed.