The SMC AS4000-03 is a high-performance speed controller designed for precise regulation of actuator speed in pneumatic systems. As part of the AS series, this model features a meter-out control type, which controls the flow of air exhausting from the actuator, providing smooth and stable operation. It is equipped with a push-lock adjustment knob, preventing accidental changes to the flow setting and ensuring consistent performance. The improved design offers a larger flow rate compared to conventional models and enhanced flow-rate characteristics for fine-tuned control. Its robust construction and one-touch fitting compatibility make it easy to install and reliable for a wide range of industrial applications.