The K series is relatively complex in structure. Although bevel gears are characterized by noise reduction, vibration damping, light weight, and low cost, which are beneficial for improving overall load-bearing capacity and tool life, they require precise matching and are subject to various conditions. The design and manufacturing cycle is also longer. Sometimes, a custom spline hollow shaft is needed, sometimes a hollow shaft locknut is required at the base, and sometimes a specially designed flange hollow shaft is necessary.