Tube Nuts Alum -4AN 20pk

The Tube Nuts Alum -4AN 20pk by ALLSTAR PERFORMANCE delivers a reliable, bulk solution for fluid system connections in high-performance automotive and industrial applications. These aluminum tube nuts are engineered for 4 AN (5/16-inch) tube fittings, providing secure, leak-resistant joints in fuel lines, coolant systems, and hydraulic circuits. Whether you're assembling a race engine fuel system, restoring a classic vehicle, or maintaining industrial equipment, this 20-pack offers cost-effective coverage for multiple projects or complete system builds.

Each tube nut is manufactured from lightweight aluminum and finished with black anodizing to resist corrosion and oxidation in harsh environments. The -4AN specification matches 1/4-inch tube outer diameter, ensuring proper thread engagement with standard AN-style fittings and hose adapters. Black anodized aluminum balances strength with weight savings—critical in performance vehicles where every ounce matters—while the anodized coating provides durable protection against fuel, oil, coolant, and environmental exposure. The 20-pack quantity eliminates repeated reordering and ensures spares are always on hand for maintenance or emergency repairs.

Tube Nuts Alum -4AN 20pk are ideal for engine builders, restoration specialists, fabricators, and motorsports enthusiasts who demand consistent, OEM-compatible connections. Installation is straightforward: thread the nut onto the AN fitting body until hand-tight, then use a wrench to achieve final torque per system requirements—typically 10–15 ft-lbs for aluminum nuts. Compatible with all standard -4AN hose and hard-tube fittings, these nuts work across fuel injection systems, turbo feed lines, transmission coolers, and brake circuits. Stock these in your shop, garage, or service kit to streamline assembly and ensure you never delay a project waiting for parts.