NUT, TUBE COUPLING (P/N ms21921-8) - New Surplus

The MS21921-8 is a steel tube coupling nut for 1/2 inch OD flareless tubing. It clamps a compression sleeve onto an externally threaded fitting to create a leak-tight joint in aircraft fluid systems. Designed to MS21921 specifications, this nut is commonly used on hydraulic lines in airframe and engine bays where vibration resistance and reliability are critical.

Installation requires the correct matching sleeve and fitting; torque per aircraft maintenance manual or applicable MS/AS fitting data to ensure proper clamp load and seal integrity.

What is the NUT, TUBE COUPLING (P/N ms21921-8)?

The MS21921-8 is a steel tube coupling nut for 1/2 inch OD flareless tubing. It clamps a compression sleeve onto an externally threaded fitting to create a leak-tight joint in aircraft fluid systems.

What conditions is the ms21921-8 available in?

The ms21921-8 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 ms21921-8?

The ms21921-8 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 ms21921-8?

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.