A Straight Male Metric Hydraulic Adapter is a fitting designed to connect hydraulic systems using metric threads, which are commonly found in Europe and other international markets. These adapters feature male threads that are identified by their outer diameter (OD) in millimeters and the thread pitch, which is the distance between each thread. For example, a designation like M22x1.5 indicates a 22mm outer diameter with a 1.5mm thread pitch. Metric fittings, while frequently used in hydraulic applications, may also refer to various types of international fittings such as BSP, DIN, and Kobelco, among others. These adapters offer a reliable connection for hydraulic systems, ensuring secure seals and efficient fluid transfer in systems with foreign threads.