-6an to 1/2-20 Inverted Flare Adapter Female

The RUSSELL -6AN to 1/2-20 Inverted Flare Adapter Female (part number 640600) is a precision hydraulic and fuel line fitting designed to bridge connections between 6 AN male ports and 1/2-20 inverted flare female ports. This straight adapter is constructed from steel with zinc oxide plating, making it suitable for hardline brake systems, fuel delivery systems, and high-pressure hydraulic applications where reliable, leak-free connections are essential. The inverted flare design ensures a secure mechanical seal that holds under pressure without requiring sealant tape or thread-locking compounds.

The 6 AN to 1/2-20 inverted flare connection is a standard pairing in automotive performance and marine applications where flexible hose transitions to rigid hardline tubing. The inverted flare configuration creates a cone-shaped seal that becomes tighter under pressure—critical for fuel systems operating at 40+ PSI and brake systems where any seepage is unacceptable. Steel construction with zinc oxide corrosion resistance provides durability in engine bays and salt-air environments. Weighing just 0.12 lbs, this compact adapter integrates cleanly into space-constrained installations without adding bulk to fuel rails, brake lines, or cooling system headers.

This adapter is essential for custom fuel system builders, brake system technicians, and motorsports builders who need to step down from AN line sizing to 1/2-inch inverted flare female ports on fuel pumps, carburetors, brake master cylinders, or distribution blocks. RUSSELL adapters are manufactured to OEM tolerances and are favored by shops performing frame-off restorations, fuel cell conversions, and high-performance brake upgrades where OE component compatibility is critical. The straight body design allows for direct in-line connections without directional constraints.