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AN818-4 Tube Coupling Nut
The AN818-4 is a short tube coupling nut manufactured to specification AN818 / SAE-AS4841. It is used in aircraft fuel, oil, hydraulic, and pneumatic systems to secure 1/4 inch (0.250") flare tubes.
Fabricated from cadmium-plated steel, it features 7/16-20 UNJF-3B threads, delivering high mechanical strength and reliable sealing when paired with the AN819-4 sleeve.
Manufacturer's release with every part. FAA Form 8130-3, EASA Form 1 or the manufacturer's certificate of conformity, exactly as received from the source. Never altered or re-issued.
Lot traceability on every shipment. Every order also ships with a Blackbird Certificate of Conformance and lot-split record linking your part to its source certificate, the receipt it arrived under and every quantity released from that lot.
Identified and stored under control. Each part is labeled with its part number, lot and certificate reference and kept at a tracked bin location.
Stock in the USA and Brazil. Margate, Florida and Cotia, São Paulo.
Run by a pilot who flies what we supply. Our founder, Marcus Graciotti, holds FAA and ANAC ATP licenses for airplanes and helicopters and grew up as the son of an aircraft mechanic. Read our story
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