Tube Nut 4an (2pk)

The Tube Nut 4AN (2pk) from EARLS is a critical fitting component for any serious automotive fuel, oil, or coolant line system. Designed for mechanics and performance enthusiasts who demand reliability in high-pressure applications, this two-pack delivers the precision engineering required for braided hose assemblies and tube connections. Whether you're building a custom fuel system, upgrading your cooling circuit, or fabricating a custom oil line setup, these fittings ensure leak-free performance under demanding conditions.

The 4AN designation refers to a quarter-inch (0.25") nominal tube size, a standard specification in motorsport and custom automotive work. EARLS tube nuts feature forged aluminum or steel construction with precisely machined threads that mate securely with AN-spec fittings and hose ends, preventing vibration-induced loosening under the stress of engine bay environments. The compact design—measuring just 1.65 inches in length—allows these nuts to fit tight engine compartments without interfering with nearby components, while their minimal weight of 0.02 lbs per nut keeps your build lightweight. The flange design provides excellent grip for wrenching and distributes clamping force evenly across the hose barb or fitting seat.

Professional mechanics, engine builders, and weekend fabricators rely on EARLS tube nuts for fuel injection systems, turbocharger oil lines, transmission coolers, and custom cooling loops where OEM fittings fall short. The two-pack format is ideal for restocking your shop toolkit or completing dual-circuit modifications. These fittings are compatible with all AN-spec braided hose, steel tubing with AN adapters, and standard EARLS hose ends, making them universally applicable across domestic and import performance platforms.