Inverted Flare Nut 2pk 9/16-18 for 1/4 Line

The Inverted Flare Nut 2pk 9/16-18 for 1/4 Line by ALLSTAR PERFORMANCE is an essential hydraulic brake and fuel line coupling component designed for high-performance automotive builds and professional repair work. These fittings are engineered to create leak-free, vibration-resistant connections on critical brake and fuel systems where reliability is non-negotiable. Whether you're assembling a street machine, restoring a classic, or maintaining a competition vehicle, inverted flare nuts form the backbone of safe, pressure-rated line terminations.

The 9/16-18 thread specification with 1/4-inch line compatibility indicates these fittings mate with standard automotive brake tubing and fuel lines using a 45-degree inverted flare seal. The inverted flare design—where the flared end of the tubing sits inside a conical seat on the fitting—distributes clamping force evenly and minimizes stress concentration at the connection. ALLSTAR's two-pack format provides redundancy for dual-circuit brake systems or multiple fuel line runs, ensuring you have matched pairs without compatibility mismatches. The compact 0.08 lbs weight and compact dimensions make storage and transport effortless for any mechanic's toolbox or shop inventory.

These fittings are ideal for fabricators, tuners, and OEM-quality restorations requiring SAE-standard brake system components or fuel delivery plumbing. Mechanics working on vintage muscle cars, modern performance platforms, and custom hot rods rely on ALLSTAR's precision-machined fittings to pass pressure tests and endure thermal cycling without weeping. Install with a flare-nut wrench to avoid stripping the hex, and pair with corresponding 1/4-inch inverted flare tubing to complete a professional-grade assembly. Proper torque and flare geometry are critical—always verify line preparation and fitting cleanliness before assembly.