FITTING NUT (P/N an6289s4) - New Surplus

The AN6289S4 is a stainless steel tube fitting locknut designed for 1/4-inch flared tube assemblies with 7/16-20 UNF threads. This locknut secures fluid line fittings and maintains packing integrity under aircraft vibration and pressure cycling. Commonly installed on fuel, hydraulic, and oil system lines in general aviation and commercial aircraft.

Installation requires torque per AN fitting specifications and the applicable aircraft maintenance manual to ensure proper clamping force and leak-free operation.

What is the FITTING NUT (P/N an6289s4)?

The AN6289S4 is a stainless steel tube fitting locknut designed for 1/4-inch flared tube assemblies with 7/16-20 UNF threads. This locknut secures fluid line fittings and maintains packing integrity under aircraft vibration and pressure cycling.

Does the an6289s4 meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The FITTING 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 an6289s4 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 an6289s4.

Can I order the an6289s4 in custom quantities?

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