NUT (P/N an818-4) - New Surplus

The AN818-4 is a tube coupling nut for 37° flared rigid tubing in aircraft hydraulic systems. This dash-4 size fits 1/4 inch tube with 7/16-20 female thread, securing a flared tube and MS20819/AN819 sleeve onto a male 37° fitting. The nut clamps the assembly together to create a leak-free hydraulic connection.

Installation requires verification of size and torque specifications in the aircraft maintenance manual. Standard hardware for general aviation and commercial aircraft fluid line assemblies.

What is the NUT (P/N an818-4)?

The AN818-4 is a tube coupling nut for 37° flared rigid tubing in aircraft hydraulic systems. This dash-4 size fits 1/4 inch tube with 7/16-20 female thread, securing a flared tube and MS20819/AN819 sleeve onto a male 37° fitting.

Does the an818-4 meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The NUT conforms to its applicable AN (Air Force-Navy), MS (Military Standard), or NAS (National Aerospace Standard) specification. Contact us for specific specification details.

What material is the an818-4 manufactured from?

Aviation hardware is available in various materials including cadmium-plated steel, stainless steel, aluminum alloy, and titanium depending on the application. Contact us for material certification and specifications for the an818-4.

Can I order the an818-4 in custom quantities?

Yes, we sell hardware in various quantities from single units to bulk lots. The NUT is available in: New Surplus. Submit an RFQ for volume pricing or call (904) 998-9101 for quantity availability.