Hoist hook surface and internal quality requirements

Hook surface and internal quality requirements:

1. The surface of the hook should be smooth and clean, without cracks, acute angles, burrs, peeling and other defects;
2. There must be no defects such as cracks, and inclusions that affect its safe use inside the hook;
3. Defects in lifting fitting hooks are not allowed to be repaired;
4. Dangerous section wear shall not exceed 10% of the original size;
5. The twisting deformation of the lifting accessory hook must not exceed 10 degrees;
6. The dangerous section or the hook handle of the hook must not be plastically deformed;
7. The thread of the hook must not be corroded.
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