Tube Nuts Alum -4AN 2pk

The Tube Nuts Alum -4AN 2pk from Allstar Performance is a precision fitting component designed for hydraulic and pneumatic fluid line assemblies in high-performance and motorsports applications. These aluminum tube nuts provide a secure, leak-free connection point in fuel systems, brake lines, and coolant circuits where reliability and durability are non-negotiable. Whether you're building a custom race engine, upgrading a classic car, or assembling hydraulic brake systems, this two-pack ensures you have matched pairs ready for installation.

Manufactured from aluminum and finished in black anodize for corrosion resistance, these -4AN tube nuts are engineered to accommodate 1/4-inch tubing with a flange-style design that creates a positive seal when torqued properly. The 4AN designation (AN = Army-Navy standard) confirms compatibility with SAE J518 code 61 flange fittings—the industry standard for motorsports plumbing. Anodized aluminum construction reduces weight compared to steel alternatives while maintaining sufficient strength for typical fuel and brake system pressures, making these fittings ideal for weight-conscious builds without sacrificing performance or safety margins.

Enthusiasts, engine builders, and fabricators rely on Allstar Performance components for consistency and fitment accuracy across custom plumbing projects. The two-pack format makes these tube nuts practical for complete fuel line runs or dual-system installations common in performance applications. Proper installation requires a wrench on the nut body while supporting the tubing to prevent stress on the connection; use appropriate thread sealant or -AN fitting best practices to ensure long-term leak-free operation. Compatible with standard -4AN tubing and flange-style fuel, oil, and brake system fittings found throughout the motorsports and hot rod communities.