856A2645G07 is a precision aerospace component, compliant with AS9100D quality standards and FAA/EASA regulations, designed for the hydraulic systems of large commercial aircraft.

It serves as a hydraulic actuator seal ring, forming a tight, wear-resistant seal between the actuator's piston and cylinder barrel. This seal maintains the pressure integrity of the actuator's working chamber, ensuring it can generate stable, precise thrust to drive aircraft components such as landing gear, flaps, or flight control surfaces, avoiding hydraulic fluid leakage that would reduce actuator force output, cause slow or uncoordinated movement of the connected component, or affect the safety of takeoff, landing, or in-flight maneuvering.

Made from oil-resistant, high-pressure and wear-resistant fluorosilicone rubber, it operates stably at -45°C to 250°C, and resists long-term contact with aviation hydraulic fluids. Weighing 0.08kg, it allows fast MRO replacement, a key component for hydraulic actuator reliability.