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　　Hook can usually be selected according to the rated lifting weight and working level, but the hook-shaped spreaders commonly used in ports need to be designed by themselves. During design, you can first determine the main dimensions of the hook according to the empirical formula, and then verify them according to the bending beam theory. The parts to be checked are: the dangerous section of the hook body, the strength of the tail thread or the hanging ear.

　　Main dimensions of hooks

　　The main dimensions of hooks can be determined according to the following empirical formula:

　　Hook with threaded tail (see Figure 5-8)

　　Calculation method of hook hole diameter。

　　Hook can usually be selected according to the rated lifting weight and working level, but the hook-shaped spreaders commonly used in ports need to be designed by themselves. During design, you can first determine the main dimensions of the hook according to the empirical formula, and then verify them according to the bending beam theory. The parts to be checked are: the dangerous section of the hook body, the strength of the tail thread or the hanging ear.

　　Main dimensions of hooks

　　The main dimensions of hooks can be determined according to the following empirical formula:

　　Hook with threaded tail (see Figure 5-8)

　　Calculation method of hook hole diameter。