-6AN Male to 5/8-18 Male Inverted Flare Fitting

The VIBRANT PERFORMANCE -6AN Male to 5/8-18 Male Inverted Flare Fitting is a precision adapter designed for high-pressure fluid line systems that demand reliable connections without compromise. This straight-configuration adapter bridges AN6 male ports to 5/8-18 inverted flare male connections, making it essential for fuel, coolant, and hydraulic applications where port thread standards differ across components.

Constructed from steel and zinc-plated for corrosion resistance, this fitting withstands the demanding environment of performance fuel systems, engine bays, and custom cooling loops. The inverted flare design creates a strong mechanical seal that resists vibration-induced loosening—a critical advantage in high-performance and motorsport applications where thermal cycling and vibration constantly stress connections. The -6AN bore accommodates fuel flow rates typical of carbureted and EFI systems, while the 5/8-18 thread pattern ensures compatibility with legacy fuel blocks, carburetors, and aftermarket manifold ports common in street rods, vintage racers, and custom engine builds.

Buyers assembling custom fuel systems, converting older carburetors to modern AN-style hose fittings, or adapting components across different threading standards rely on fittings like this to bridge incompatible port types. Whether plumbing a vintage engine bay, upgrading a fuel system, or fabricating a specialized cooling or hydraulic circuit, this adapter solves the real challenge of connecting mismatched thread standards without reducing bore diameter or creating flow restrictions.

VIBRANT PERFORMANCE has established itself in the motorsports and performance automotive community for producing reliable hose and fitting solutions that hold pressure under demanding conditions. This model (part number 16426) is a proven choice for custom fuel system fabricators and performance builders who cannot afford fitting failures.