1/4 NPT Female Weld On Fitting

The 1/4 NPT Female Weld On Fitting is a precision aluminum bung assembly engineered for fuel system, coolant line, and hydraulic applications where permanent panel integration is required. This recessed flange weld-on fitting serves as a sealed access point or connection port on fuel tanks, reservoir walls, and custom fabrication projects where threaded access must be flush-mounted and leak-proof. Commonly specified in hot rod fuel systems, custom vehicles, and industrial equipment, this fitting eliminates the need for protruding bosses while maintaining full NPT thread compatibility.

Manufactured from aluminum in natural finish, the 1/4 NPT Female Weld On Fitting features a recessed flange design that provides a wide welding surface for structural integrity and repeatable pressure sealing. The female NPT thread (National Pipe Taper) creates a self-sealing mechanical advantage without additional sealant, ensuring reliability under vibration and thermal cycling. The compact footprint—measuring 2.75 x 0.85 x 3.65 inches and weighing just 0.04 pounds—makes it ideal for space-constrained installations where panel-mount solutions are preferable to external fittings. The recessed profile sits flush or semi-flush to the mounting surface, reducing snag hazards and simplifying finished fabrication aesthetics.

Builders, fabricators, and restoration specialists choose this weld-on bung for custom fuel tank builds, radiator modifications, and aftermarket coolant line routing in performance and classic vehicle applications. Installation requires TIG or MIG welding to the parent metal; the 1/4 inch NPT female port accepts standard male-threaded adapters, hoses, and quick-disconnect couplings rated for fuel and fluid transfer. Verify base metal thickness and welding capability before ordering, and ensure downstream components are rated for your system's pressure requirements. This fitting is sold individually and pairs seamlessly with NPT male adapters, banjo fittings, or straight hose barbs for custom plumbing configurations.