856A4207G01 is a precision aerospace component, compliant with AS9100D quality standards and FAA/EASA regulations, designed for the lubrication systems of CFM56 series aircraft engines.

It functions as an oil seal ring for the engine's low-pressure turbine shaft, forming a tight, oil-resistant seal between the turbine shaft and the engine housing. This seal prevents the leakage of engine lubricating oil, ensuring sufficient lubrication for the turbine's moving components, avoiding excessive friction, overheating, or component seizure that would cause engine power loss or failure during flight.

Made from heat-resistant, wear-resistant fluorosilicone rubber, it operates stably at -50°C to 280°C, and resists long-term contact with aviation lubricating oil. Weighing 0.07kg, it enables fast MRO replacement, a critical component for turbine system reliability and flight safety.