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

The Tube Nut Fitting -3AN Tube Size 3/16in by Vibrant Performance is a precision hose connector engineered for high-performance fluid systems in automotive, motorsports, and industrial applications. This AN (Army-Navy) standard fitting serves as the critical junction point where tubing terminates, providing a secure mechanical lock that prevents separation under vibration, pressure cycling, and thermal stress. Whether you're assembling a fuel system, cooling circuit, or hydraulic line, this tube nut fitting ensures leak-free connections that meet or exceed OEM specifications.

Constructed from aluminum and finished in black anodized coating, this -3AN fitting accommodates 3/16-inch tube diameter with reliable repeatability across assembly cycles. The anodized finish resists corrosion while maintaining low weight—critical in racing and weight-sensitive applications—and the aluminum construction provides excellent thermal conductivity for heat-sensitive fluid transfer. The tube nut design incorporates a flared seating surface that compresses against the mating port, creating a metal-to-metal seal without reliance on rubber gaskets that degrade under fuel, oil, or coolant exposure. This fitting's compact footprint and standardized AN thread pattern ensure compatibility across manufacturers following SAE J518 specifications.

Technicians and enthusiasts building custom fuel systems, turbo lines, transmission coolers, and nitrous oxide delivery systems rely on -3AN fittings for their proven performance under sustained pressure and thermal cycling. The 3/16-inch tube size represents the most common sizing in small-displacement and mid-range power applications, offering optimal flow rates while minimizing hose bulk. Installation requires proper flaring tools and torque specifications to ensure the seal develops fully; over-tightening risks aluminum thread stripping, while under-tightening permits weeping or catastrophic failure. Always pair this fitting with SAE-compliant AN hose and verify compatibility with your system's operating pressure and fluid specification before deployment.