1. The 钩子 used in the lifting mechanism driven by manpower is tested with 1.5 times the rated load as the inspection load.
2. The 钩子 used for the power-driven lifting mechanism shall be tested with 2 times the rated load as the inspection load.
3. 之后钩子从检验载荷中取出，应无明显缺陷或变形，开口度增加不应超过原尺寸的0.25%。
4. 对于钩子s that have passed the inspection, a mark should be printed in the low-stress area of the 钩子, including the rated lifting weight, factory mark or factory name, inspection mark, production number, etc.
该钩子发生下列情况之一时应报废：
─ 裂纹；
②危险断面磨损达到原尺寸的10%；
③开口度比原尺寸增加15%；
④The torsion deformation of the 钩子 body exceeds 10°;
⑤The dangerous section of the 钩子 or the neck of the 钩子 is plastically deformed;
⑥The 钩子 thread is corroded;
⑦When the wear of the 钩子 bushing reaches 50% of the original size, the bushing should be replaced;
⑧ 当工件的心轴钩子磨损到原始尺寸的 5%，应更换芯轴。