6AN Male to 9/16-18 O-Ring Aluminum Black

The 6AN Male to 9/16-18 O-Ring Aluminum Black fitting from REDHORSE PERFORMANCE is a precision hydraulic adapter engineered for high-pressure fluid transfer applications. This straight-configuration adapter connects AN (Army-Navy) male threads on one end to SAE O-ring boss (ORB) ports on the other, making it essential for fuel systems, brake lines, transmission coolers, and custom plumbing in performance vehicles and motorsport applications. Built for reliability in demanding environments, this adapter eliminates guesswork when integrating components with mismatched port standards.

Constructed from lightweight anodized aluminum and finished in black, the 6AN Male to 9/16-18 O-Ring adapter combines durability with corrosion resistance. The male AN fitting (6AN) accepts standard AN hose ends, while the 9/16-18 O-ring boss connection employs a resilient elastomer seal that prevents leakage under pressure without requiring PTFE tape. The straight design minimizes turbulence and pressure loss, critical in applications where flow efficiency directly impacts system performance. At just 0.065 lbs, this compact fitting (2.8 x 1.1 x 3.8 inches) integrates seamlessly into tight engine bays and custom fabrication projects.

This adapter is ideal for fabricators, mechanics, and performance enthusiasts building or modifying fuel delivery, cooling, or brake systems where component standardization is impossible. It's particularly valuable in street rods, race cars, custom truck builds, and marine applications where OEM hose routing won't fit. Installation requires basic wrench work—simply thread the AN male end into your hose assembly and the ORB end into the receiving port. Verify thread compatibility and apply appropriate thread sealant to male threads before assembly for optimal results.