(1) The opening degree (opening length) of the hook is 15%.

(2) The torsion deformation degree of the hook is 10 degrees.

(3) Plastic deformation of the hook section or the hook neck.

(4) There are cracks on the surface.

(5) Wear of the hook

a According to the national standard, the hook wear reaches 5% of the original size;

b Hooks wear to 10% of the original size according to industry standards.

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