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The regular inspection time of crane hooks should be determined according to the frequency of use, working environment and relevant safety standards (such as GB/T 6067 "Safety Regulations for Lifting Machinery", ISO 4309, etc.). The following are detailed inspection cycle requirements:

1. Daily inspection (before each use or before each shift)

• Check content :

  • Visually inspect the hook surface for cracks, deformation, or severe wear .

  • Check whether the anti-unhooking device (such as spring lock, tongue) is intact.

  • Test the hook's swivel ability (if it is a swivel hook).

  • Check whether the hook opening is abnormally increased.

• Record requirements : If any abnormality is found, stop using the equipment immediately and report it for repair.

2. Monthly inspection (every month or 300 working hours)

• Check content :

  • Measure the amount of wear (hook mouth, dangerous section diameter, etc.) and compare it with the allowable wear standard (≤5%~10%).

  • Check the threads and hook shank for deformation, corrosion or damage.

  • Lubrication check (such as rotating bearing parts).

  • Magnetic particle testing (MT) or penetrant testing (PT) (if the working environment is harsh).

• Record requirements : Save test data and create files.

3. Annual comprehensive inspection (every 12 months or 3,000 working hours)

• Check content :

  • Non-destructive testing (UT/MT/PT) : Comprehensively check for cracks and internal defects.

  • Hardness test : Ensure that the material has not been annealed by high temperature or overload.

  • Load test : Conduct static load test at 1.25 times the rated load (if necessary).

  • Comprehensive dimensional measurement : compare with original data and evaluate wear and deformation.

• Execution personnel : must be operated by professional testing organizations or certified personnel.

4. Additional inspections under special conditions

• High frequency use (such as ports and metallurgical industries) : shorten the comprehensive inspection to every 6 months .

• Corrosive environment (chemical, marine) : Add quarterly corrosion inspection (ultrasonic thickness measurement).

• Overload or shock history : Immediately stop and check, even if the scheduled cycle is not due.

5. Mandatory scrapping inspection

• Use life :

  • Generally, the lifespan of a hook is 10 to 15 years (refer to manufacturer's standards).

  • After the period has expired, a comprehensive inspection is required twice a year even if there are no visible defects .

Regulatory basis

• Chinese Standard (GB/T 6067) : Clearly requires that hooks be inspected regularly and records be kept.

• EU Standard (FEM 1.001) : specifies annual load testing and non-destructive testing.

• OSHA (USA) : Requires monthly visual inspections + annual professional inspections.

Inspection records and scrap management

• Record retention : Inspection reports shall be retained for at least 3 years .

• Scrap disposal : Oversized hooks should be cut and destroyed to avoid misuse.

Safety Tips :

• "Disable upon discovery" principle : Even if the inspection cycle has not yet arrived, if any abnormality (abnormal noise, jamming, deformation) is found, it must be immediately disabled and inspected.

• Repair by welding is prohibited : the hook must not be welded, and must be replaced if the wear or cracks exceed the standard.