NUT, TUBE COUPLING (P/N ms21921-6) - New Surplus

The MS21921-6 is a tube coupling nut for 3/8 inch OD flareless fittings in aircraft fluid systems. This steel nut threads onto a compatible fitting body to compress the ferrule sleeve and create a leak-free seal on hydraulic, fuel, and pneumatic lines. Built to MS21921 standard specifications, it provides a serviceable connection that can be disconnected and reconnected during maintenance without replacing the sleeve.

Installation requires threading the nut onto the fitting body until snug, then torquing per aircraft maintenance manual specifications.

What is the NUT, TUBE COUPLING (P/N ms21921-6)?

The MS21921-6 is a tube coupling nut for 3/8 inch OD flareless fittings in aircraft fluid systems. This steel nut threads onto a compatible fitting body to compress the ferrule sleeve and create a leak-free seal on hydraulic, fuel, and pneumatic lines.

Does the ms21921-6 meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The NUT, TUBE COUPLING 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 ms21921-6 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 ms21921-6.

Can I order the ms21921-6 in custom quantities?

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