NUT, COUPLING (P/N an818-4j) - New Surplus

The AN818-4J is a coupling nut (B-nut) for 37-degree flared tube fittings per AN818 specifications. Constructed from corrosion-resistant steel, this -4 size nut accommodates 1/4-inch tubing when paired with the matching AN819 sleeve. The nut clamps the flared tube end against a male fitting to create a metal-to-metal seal in aircraft hydraulic systems.

Installation requires the correct sleeve and torque application per AN standards and aircraft maintenance procedures to ensure leak-free connections.

What is the NUT, COUPLING (P/N an818-4j)?

The AN818-4J is a coupling nut (B-nut) for 37-degree flared tube fittings per AN818 specifications. Constructed from corrosion-resistant steel, this -4 size nut accommodates 1/4-inch tubing when paired with the matching AN819 sleeve.

What conditions is the an818-4j available in?

The an818-4j 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 an818-4j?

The an818-4j 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 an818-4j?

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.