90-Degree Male Metric adapters are commonly used in hydraulic systems, particularly in Europe, where Metric threads are the standard. These threads are defined by both the outer diameter (OD) and the thread pitch, with dimensions typically specified in millimeters. The letter "M" is part of the designation, followed by the measurement of the outer diameter (OD), then the thread pitch. For example, M22x1.5 represents a Metric adapter with a 22mm male thread outer diameter and a 1.5mm thread pitch. This thread style ensures secure, leak-free connections in hydraulic systems, offering precision and reliability. Metric adapters are essential for high-pressure fluid power systems and are widely used in industrial applications requiring flexible and durable connections.