#6 > 5/8-20 Carter

The EARLS #6 to 5/8-20 Carter straight adapter fitting is a precision hose and fuel line component designed for custom fuel system builds and high-performance engine modifications. This adapter bridges two different port sizes, allowing technicians and enthusiasts to connect #6 AN hose assemblies to 5/8-20 threaded ports commonly found on fuel rails, carburetors, and aftermarket fuel system components. Whether you're fabricating a fuel line for a street rod, race car, or custom fuel injection setup, this Carter adapter ensures leak-free connections and reliable fuel delivery under pressure.

EARLS is renowned for manufacturing aircraft-grade AN fittings and adapters that meet strict SAE standards, and this straight adapter exemplifies that engineering precision. The #6 AN designation refers to a hose size with a 3/8-inch inner diameter, while the 5/8-20 thread specification indicates a 5/8-inch port with 20 threads per inch—a common metric in vintage carburetors and custom fuel blocks. The straight configuration (as opposed to 45° or 90° elbows) simplifies routing in tight engine bays and reduces turbulence in fuel flow.

Its compact 1.3 x 1.2 x 1.85-inch footprint and negligible 0.02 lb weight make it ideal for weight-conscious builds without sacrificing durability or flow integrity. This Carter adapter is essential for custom fuel system integrations, particularly in restorations, race applications, and engine swaps where OEM fuel ports don't align with modern AN fittings.