Optimized design and manufacture for the service life of the coupling and the service life of the coupling accessories respectively, which can prolong the service life.The two halves of the ordinary cast iron coupling are easily hurt when the two halves of the coupling are broken. The high-quality coupling should match the strength of the two halves of the coupling with the overall strength of the transmission system, and the strength of the coupling accessories is the nominal rotation of the coupling. Torque requirements, that is, the failure mode of the coupling should be that the coupling parts are damaged and the two halves of the coupling are basically intact. Such a coupling is of high quality.Coupling materials are roughly divided into sections, castings, forgings, etc., and cast steel and forgings are most of the choices of coupling materials.