Tube Nut Fitting -4AN Tube Size 1/4in

The Tube Nut Fitting -4AN Tube Size 1/4in is an essential component for anyone building or modifying a high-performance fuel, coolant, or hydraulic system on a vehicle. Whether you're upgrading your engine bay plumbing on a street rod, race car, or custom build, this fitting serves as the critical connection point between rigid steel tubing and flexible AN hose lines. Mechanics and fabricators rely on tube nut fittings to create leak-free, vibration-resistant joints that withstand the demands of modern automotive applications.

This -4AN tube nut fitting is engineered to mate with 1/4-inch outer diameter tubing using a flared tube connection method that ensures a secure, sealed joint without requiring additional brazing or welding. The AN (Army-Navy) standard sizing means the -4 designation corresponds to a 1/4-inch hose inner diameter, making this fitting compatible with standard -4AN hose assemblies and adapters found in performance fuel systems, cooling circuits, and transmission cooler lines. The compact design—measuring just 3.5 inches in overall length—allows installation in tight engine compartments where space is a premium, while the minimal 0.02-pound weight ensures no measurable impact on vehicle dynamics or fuel economy.

This fitting is ideal for fuel system upgrades, forced induction installations, custom cooling loops, and any fabrication project requiring a dependable tube-to-hose transition. Installers appreciate the straightforward compression design, which eliminates the guesswork often associated with swaged or crimped connections. When paired with quality AN hose and complementary fittings, the Tube Nut Fitting -4AN Tube Size 1/4in delivers the reliability demanded by street enthusiasts, weekend warriors, and professional tuners who refuse to compromise on fluid system integrity.