The main functions of the long hexagonal connecting nut include providing greater torque, adjusting the spacing and angle of the fastening points, protecting the material of the connection, and ensuring the firmness of the connection. Specifically, the long hexagonal connecting nut can provide greater torque during the connection process, ensuring the firmness of the connection; When the distance or angle between two components at the connection does not match, one or more nuts can be used for adjustment; In addition, it can also disperse the pressure between connecting components, reduce friction and wear, extend the service life of connecting components, and reduce the possibility of loosening and failure.