Tube Nut Fitting -3AN Tube Size 3/16in

The Tube Nut Fitting -3AN Tube Size 3/16in by Vibrant Performance is a precision-engineered hydraulic line connector designed for high-performance fuel, oil, and coolant systems in modified vehicles. This compact fitting serves as the critical interface between aluminum tubing and hard-line manifolds, carburetors, and engine bay components in custom builds where reliability under pressure is non-negotiable. Whether you're running a fuel system upgrade, installing a remote oil filter kit, or plumbing a custom cooling loop, a properly rated AN fitting prevents leaks that could compromise performance or create safety hazards on the track or street.

Vibrant Performance tube nut fittings utilize a straight-thread design with a 45-degree flare seat geometry that creates a metal-to-metal seal without requiring thread sealant tape or compound. The -3AN designation refers to a 3/16-inch tube outer diameter, a universal standard in automotive fuel and fluid systems that accepts 0.120-inch wall aluminum or steel tubing. The nut body is engineered from anodized aluminum or chrome-plated steel to resist corrosion in underhood environments while remaining lightweight for custom installations where every ounce matters. This fitting's compact form factor—measuring just 3.65 inches in length and under an ounce—makes it ideal for tight engine bay packaging without sacrificing pressure capacity or flow rate.

Mechanics and fabricators building fuel-injected conversions, turbo systems, and engine swaps rely on -3AN fittings to eliminate leaks at critical junction points where aluminum hard lines transition to rigid manifolds or flexible fuel hose. Installation requires only a wrench to secure the nut against the flare seat—no tools or expertise beyond what any shade-tree mechanic possesses. Ensure your tubing is cut square, flared with the correct die, and fully seated before final torque to prevent leaks. This fitting works seamlessly with all SAE J514 -3AN tube, hose, and port adapters, making it the universal connector for serious automotive plumbing.