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.

What conditions is the ms21921-6 available in?

The ms21921-6 is currently available in the following conditions: New Surplus. Each condition reflects the part's maintenance history and certification status per FAA standards.

How do I get pricing for the ms21921-6?

The ms21921-6 requires a custom quote. Submit a Request for Quote (RFQ) through our website or call our sales team at (904) 998-9101 for immediate pricing assistance.

Do you offer expedited shipping for the ms21921-6?

Yes, we offer same-day processing on in-stock items and provide 24/7 AOG (Aircraft on Ground) support for urgent needs. Standard, expedited, and overnight shipping options are available.