DIN1800 (M1800) Crescent-Shaped Open Retaining Ring

DIN 1800 (M1800) crescent-shaped open retaining ring is a specialized type of external retaining ring used in automotive and industrial applications. These retaining rings are designed to fit into grooves on the exterior of a shaft, providing axial retention for components such as bearings, gears, pulleys, or other rotating parts. The crescent shape distinguishes this design from standard circular retaining rings, offering unique advantages in specific applications.The crescent shape allows the retaining ring to have an open-ended design with a curved profile. This design provides flexibility during installation and ensures a secure fit in the groove while allowing for easier removal compared to fully circular rings.
Like other external retaining rings, the DIN 1800 is installed on the outside of a shaft and fits into a groove to prevent components from moving axially outward.
The crescent shape reduces the material required for the ring, making it lightweight and space-efficient while maintaining its functionality.
Common materials include carbon steel , stainless steel , and sometimes plastic (e.g., nylon) for corrosion resistance or lightweight applications.