The Freudenberg-NOK SP433 is a PTFE white spiral backup ring with an inner diameter of 5.5 inches and an outer diameter of 6 inches. This backup ring is compliant with the AS568-433 standard, ensuring it meets rigorous industry requirements. Constructed from high-grade PTFE, it offers exceptional resistance to chemicals and high temperatures, making it suitable for various sealing applications. The 1/4 inch thickness provides robust support, preventing seal extrusion and enhancing the performance of hydraulic and pneumatic systems.
