857A4633G02 is a precision aerospace component compliant with AS9100D quality standards and FAA/EASA regulations, dedicated to aircraft engine fuel control systems.It acts as a high-precision fuel metering orifice, a core part for regulating fuel flow in engine combustion systems during MRO assembly. It ensures accurate fuel delivery matching engine operating conditions, optimizing combustion efficiency, preventing lean or rich burn, and avoiding power fluctuation or flameout risks during flight.Made of corrosion-resistant aviation stainless steel with precision drilling, it resists high-temperature fuel erosion, working stably at -50℃ to 290℃. Weighing 0.06kg, it features tight dimensional tolerance for reliable metering performance, a critical component to guarantee engine fuel supply accuracy and operational safety.