AN Weld Bung 4AN Male Steel

The AN Weld Bung 4AN Male Steel from ALLSTAR PERFORMANCE is a precision hydraulic adapter designed for custom fluid line systems in racing, fabrication, and high-performance applications. This weld-on bung serves as a termination or connection point for 4AN (AN4) hose and line assemblies, providing a permanent, leak-free interface when integrated directly into fuel tanks, radiators, or custom chassis frameworks. Fabricators and engine builders rely on weld bungs to create clean, integrated fuel and coolant systems where threaded ports are impractical or space constraints demand a flush, welded installation.

Constructed from steel in its natural finish, this 4AN male adapter is engineered for durability and corrosion resistance in demanding environments. The weld-on design eliminates joint stress and potential failure points associated with threaded connections, ensuring a monolithic seal once properly welded into place. The 4AN designation refers to the SAE AN standard port size, compatible with industry-standard 4AN hose assemblies, adapters, and fittings found across racing fuel systems, custom cooling loops, and aeronautical applications. Steel construction provides superior strength and thermal stability compared to aluminum alternatives, making it ideal for high-pressure fuel systems and engine bay installations where reliability is non-negotiable.

This weld bung is essential for custom fabricators, race teams, and automotive enthusiasts building bespoke fuel delivery and cooling systems. Installation requires welding the base to a compatible mounting surface—typically aluminum or steel tank walls—creating a permanent, vibration-resistant connection. The 4AN male thread accepts standard AN hose fittings, quick-disconnects, or adapter components downstream of the weld point, allowing seamless integration into modular fuel or coolant systems. Proper welding technique and compatible base materials ensure maximum longevity and safety in high-vibration or high-temperature engine compartments.