Inverted Flare Adapter Fitting -8AN to 5/8in-18

The Inverted Flare Adapter Fitting -8AN to 5/8in-18 by VIBRANT PERFORMANCE is an essential hydraulic line connector for builders upgrading fuel, coolant, or brake systems on high-performance vehicles. This adapter bridges two critical industry standards—the -8AN (AN8) SAE flare size and the 5/8-18 UNF thread specification—making it indispensable for custom fuel rail installation, turbo coolant lines, and modern brake conversion projects. Whether you're fabricating a custom fuel system or retrofitting period-correct components into a modern engine bay, this fitting ensures leak-free, pressure-rated connections in demanding motorsport and street-rod applications.

Constructed with precision engineering, the inverted flare design allows the fitting to seal against the male flare on the adapter end while the 5/8-18 thread accommodates standard NPT and UNF ports found on aluminum intake manifolds, fuel blocks, and OEM components. VIBRANT PERFORMANCE's proven track record in high-flow manifold and intercooler fittings means this adapter maintains full structural integrity under sustained boost pressure and thermal cycling. The compact 3.54-inch length and lightweight 0.04-pound design minimize packaging constraints in tight engine compartments, while the forged brass or aluminum construction resists corrosion and vibration loosening—critical factors in turbocharged and supercharged installations where temperature swings exceed 200 degrees Fahrenheit.

Experienced fabricators and engine builders rely on this fitting when converting between legacy carbureted fuel systems and modern electronic fuel injection, or when integrating aftermarket radiators and coolant filtration into older chassis. Installation requires only standard SAE wrench sizes and basic hydraulic line knowledge; a -8AN hose barb or compression fitting screws onto the adapter's male end, while the inverted flare threads directly into your manifold or fuel block port. Verify thread compatibility with your specific application before purchase—this fitting is NOT a substitute for NPT-to-AN adapters on straight-pipe NPT ports, nor suitable for propane or acetylene gas service. Stock one for quick repairs or grab several for a complete system overhaul.