Alum #8 Locknut

The Alum #8 Locknut from AEROQUIP is a precision-engineered bulkhead fitting nut designed for high-performance hydraulic and pneumatic systems. Built to secure AN-8 (1/2-inch) connections, this aluminum locknut is essential for technicians, mechanics, and engineers working with aircraft, motorsport, and industrial fluid power applications where vibration resistance and reliability are non-negotiable. Its compact, lightweight construction makes it ideal for space-constrained installations where every ounce matters.

Manufactured from aluminum and finished with durable blue anodizing, this locknut resists corrosion while maintaining exceptional strength-to-weight performance. The blue anodized coating serves dual purposes: it protects the aluminum substrate from oxidation and provides high visibility in complex fluid line assemblies for easier identification and maintenance. The self-locking design prevents accidental loosening under vibration—a critical feature in dynamic environments such as engine bays, fuel systems, and hydraulic circuits. AEROQUIP's precision threading and locknut geometry ensure secure, repeatable connections that maintain integrity over thousands of cycles.

This locknut is most beneficial for aircraft maintenance technicians, custom motorsport builders, and hydraulic system integrators who demand mil-spec or equivalent reliability. It pairs seamlessly with AN-8 bulkhead fittings and compatible hose adapters, making it a drop-in replacement for OEM assemblies or new installations. Installation requires only standard wrenches—no specialized tools needed. Each unit is sold individually, allowing you to purchase exactly what your system requires for repair, upgrade, or assembly projects.