When the crane hook should be stopped in use?

Lifting hook is an important accessories of electric hoist. Due to the heavy loading in the use of lifting, the fatigue crack may occur, and hoist inspection is needed at least 1 to 3 times a year, regular annealing treatment is also needed, to ensure the safety of operation and to extend the life of the hook.

In the following cases, the hook to be discarded and replaced:

• 1. Use a 20x magnifying glass to observe the surface of the hook, the cracked or broken hook should be replaced.
• 2. For the critical section of hook, when wearing more than 10% , it cannot be used any longer.
• 3. The hook should be replaced when permanent deformation occurs during loading testing.
• 4. The hook should be replaced when the end or the thread part of the hook has cracks or deformation.
• 5. The hook should be replaced when the transition corner of hook end has fatigue cracks.

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