The needle cylinder is a pneumatic actuator with a special structural form. Its core feature is that its drive shaft has a relatively slender shape and the overall structural design is extremely compact. This unique design gives it a significant advantage in situations where the installation space is strictly limited or deep hole operations are required. Its working principle is based on compressed air driving the internal moving components, and through a high-precision guide mechanism, the air pressure energy is converted into a precise linear motion output along the axial direction. Needle cylinders are often used in precision equipment or special mechanisms that require a small size, a long stroke, and precise linear push-pull movements, providing a compact and reliable drive solution for specific scenarios.