The brass nickel plated M22 connector with threaded protective cap adopts an M22 threaded interface and is suitable for cleaning machinery, hydraulic systems, pneumatic systems and other occasions that require quick connection and disconnection. The connector is precision-machined from high-quality brass and has a multi-layer nickel plating treatment on the surface to ensure long-term stable operation under harsh working conditions. The nut is coated with a high-strength engineering plastic sheath to provide a comfortable grip and effectively insulate to prevent operators from getting burned. It is particularly suitable for use in high-temperature media environments. This connector is equipped with a protective cap that matches the connector thread, which effectively prevents dust, impurities and other contaminants from entering the connector, protects the thread and sealing surface, and extends the service life of the connector.