Inverted Flare Nut 2pk 1/2-20 for 1/4 Line

The Inverted Flare Nut 2pk 1/2-20 for 1/4 Line by ALLSTAR PERFORMANCE is a critical fastening component for high-performance fuel, oil, and brake line systems where leak-free connections are non-negotiable. Built for serious engine builders, race teams, and restoration enthusiasts, these inverted flare nuts provide the reliable sealing necessary for demanding applications—whether you're assembling a carbureted street engine, building a fuel-injected race platform, or restoring a classic vehicle. The two-pack format ensures you have backup nuts on hand during assembly or repair work.

Inverted flare connections work by compressing the flared end of the tubing against the conical seat inside the nut, creating a metal-to-metal seal that resists vibration and pressure cycling far better than standard compression fittings. The 1/2-20 thread pitch designation indicates a half-inch diameter with 20 threads per inch—the industry standard for most automotive fuel and brake line applications. These nuts accommodate 1/4-inch tubing, the most common line size in classic and modern performance vehicle plumbing, and the inverted design allows technicians to reuse existing flared tubing without re-flaring, saving time and material cost during repairs or modifications.

Mechanics and fabricators rely on ALLSTAR PERFORMANCE inverted flare nuts when building custom fuel systems, installing adjustable pressure regulators, or replacing worn hydraulic connections on brake systems. Compatibility spans carburetors, fuel filters, regulators, and manifold blocks equipped with inverted flare ports. The lightweight design (0.06 lbs per pair) reflects their compact footprint, ideal for tight engine bay layouts where space demands efficiency. Installation requires only a wrench—no special tools—making these nuts accessible for both professional shops and dedicated DIY builders tackling serious powertrain work.