Retaining rings for adapters are essential components used in fluid power systems to secure parts in place, preventing them from moving or coming loose during operation. These rings are designed to fit into grooves on fittings or adapters, providing a tight, secure hold. Typically made from high-quality materials like carbon steel or stainless steel, retaining rings ensure a leak-proof connection and help maintain the integrity of the system under pressure. They are commonly used in a wide range of applications, including hydraulic and pneumatic systems, where reliability and durability are critical.