A Piston Snap Ring is a circular ring with a split or gap in its circumference. This gap allows the ring to be expanded and placed into a groove machined into the piston pin bore or the piston itself. The snap ring exerts outward pressure against the groove walls, effectively securing the piston pin in place and allowing it to pivot and connect the piston to the connecting rod in an internal combustion engine.

Attributes:
• Prevents the piston pin from coming out of its bore during engine operation.
• Withstands the mechanical forces and temperature variations within the engine.

Applications:
A Piston Snap Ring is used to secure the piston pin within the piston. This is critical for proper engine operation, as it allows the piston to pivot on the pin, connecting the piston to the connecting rod.