HU37646-1 is a precision-manufactured aerospace engine fuel system fuel nozzle seal, compliant with AS9100D quality standards and FAA/EASA regulations, designed for CFM56 series turbofan engines. It seals the connection between the fuel nozzle and the combustion chamber fuel manifold, preventing high-pressure fuel leakage before injection, which is critical for maintaining accurate fuel delivery volume, ensuring the fuel-air mixture ratio in the combustion chamber is optimized, avoiding incomplete combustion, excessive fuel consumption, or combustion instability.

Made from heat-resistant, oil-resistant fluorosilicone rubber with a reinforced nickel alloy core, it withstands operating temperatures from -55°C to 220°C and fuel system pressures up to 6200 psi. Weighing 0.05kg with a precision-machined sealing surface, it enables fast replacement and tightness verification during fuel system MRO overhauls. FAA Part 25 certified, it is a key component for combustion system efficiency.