Mini cylinder represents a class of actuators that focus on extreme space optimization. Its core design concept is to highly condense the basic actuation functions and achieve precise displacement or force output within an extremely limited physical scale. This type of component usually serves application scenarios that have strict constraints on the installation volume or require high integration. Its essence is to provide a compact and lightweight solution to meet the basic needs of linear or rotary motion in precision equipment or micro systems. The design of mini cylinder focuses on maintaining reliable motion execution capabilities within a miniaturized framework, and is one of the key basic components for miniaturization and functional density of precision mechanical structures.