## Namura NA-10025R Piston Rings 68.45mm - Reliability and Performance The Namura NA-10025R piston rings with a diameter of 68.45mm are a key component for ensuring optimal engine performance. Often overlooked, these rings play a vital role in efficiency, durability, and combustion effectiveness. Namura, renowned for high-quality engine components, designs its rings for specific applications, taking into account the type of cylinder sleeve, its coating, engine size, and stroke type (2 or 4). This allows for the selection of the ideal material composition to meet the demands of the operating environment. ### Advanced Materials and Technologies Namura uses the highest quality materials in the production of piston rings, ensuring excellent wear resistance and sealing. Both compression and oil rings are characterized by precise workmanship and advanced technologies. ### Compression Rings Made of highly ductile cast iron or stainless steel alloy, the compression rings guarantee excellent sealing and minimize compression losses. Additional chrome, phosphate, or nitride coatings increase their durability and resistance to extreme temperatures. ### Oil Rings The oil ring set consists of three components: two scraper rails made of highly ductile cast iron or stainless steel alloy, coated with chrome, nitride, or phosphate, and one stainless steel expander ring. This design effectively regulates oil flow, preventing it from entering the combustion chamber and ensuring optimal lubrication. ### Precision and Fit The Namura NA-10025R piston rings with a diameter of 68.45mm guarantee precision and a perfect fit. This ensures smooth, quiet, and efficient engine operation, providing optimal performance and long service life.