NUT (P/N ms21921k4) - New Surplus

The MS21921K4 is a flareless tube coupling nut for aircraft hydraulic and fuel system lines. Manufactured from corrosion-resistant steel, this nut secures a ferrule and fitting body to create a leak-tight joint on 1/4-inch tubing. It complies with MS21921/AS21921 aerospace standards for reliable fluid system connections.

Installation requires proper alignment of the ferrule with the male fitting, followed by torque application per MS/AS21921 specifications and the aircraft maintenance manual. Correct assembly ensures dependable sealing under pressure and vibration in flight operations.

What is the NUT (P/N ms21921k4)?

The MS21921K4 is a flareless tube coupling nut for aircraft hydraulic and fuel system lines. Manufactured from corrosion-resistant steel, this nut secures a ferrule and fitting body to create a leak-tight joint on 1/4-inch tubing.

Does the ms21921k4 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 ms21921k4 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 ms21921k4.

Can I order the ms21921k4 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.