Male Adapter Fitting #6 x 5/8-20 Carter Black

The Male Adapter Fitting #6 x 5/8-20 Carter Black by FRAGOLA is a precision straight-thread adapter engineered for custom fuel system builds, hydraulic lines, and high-pressure fluid transfer applications. This fitting bridges two different port standards—a 6 AN (AN6) male connection on one end and a 5/8-20 male port on the other—making it essential for retrofitting aftermarket fuel rails, carburetors, pressure regulators, and remote filter mounts onto vehicles with mixed legacy and modern plumbing. Whether you're upgrading a classic hot rod's fuel delivery or adapting specialty components in a high-performance build, this adapter eliminates the need for multiple fittings or custom fabrication.

Machined from aluminum and finished in black anodizing, the Male Adapter Fitting #6 x 5/8-20 Carter Black delivers lightweight corrosion resistance and a clean, professional appearance under the hood. The straight-thread design eliminates 45° or 90° jogs, allowing for direct, inline connections in tight engine bays or fuel cell compartments. Black anodized aluminum provides superior oxidation protection compared to bare aluminum, ensuring long-term durability against fuel, oil, coolant, and weather exposure. The 6 AN male end features the standard SAE flange geometry, while the 5/8-20 male port accepts standard NPT or metric boss fittings, guaranteeing compatibility with a vast range of aftermarket and OEM components.

Mechanics, fabricators, and serious enthusiasts working on fuel-injected conversions, carbureted restorations, and turbocharged engine swaps rely on FRAGOLA adapters for leak-free, vibration-resistant connections. Installation is straightforward: apply appropriate thread sealant (PTFE tape or AN-rated compound) to the 5/8-20 port, thread the fitting hand-tight, then torque using an adapter wrench to avoid twisting the aluminum body. Verify that both ports are clean and free of debris before assembly. This compact adapter (1.5 × 1 × 4.3 in, 0.03 lbs) integrates seamlessly into engine bays with limited space, making it ideal for custom fuel systems, supercharger intercooler lines, and hydraulic clutch or brake conversions.