#12 Male Alum Weld Bung w/ 1.0 Dia. Step

The FRAGOLA #12 Male Aluminum Weld Bung with 1.0 Diameter Step (Part #499562) is a precision-engineered hydraulic and fuel system fitting designed for permanent weld-on installation in high-performance applications. This aluminum bung delivers reliable port access in racing engines, custom fuel systems, and specialized fluid circulation setups where a secure, welded connection is essential.

The #12 AN male thread pattern conforms to AN (Army-Navy) standard specifications, ensuring compatibility with industry-standard fittings and hoses rated for that connection size. The 1.0-inch diameter step provides the positioning and sealing surface necessary for proper weld preparation and structural integrity. Constructed from aluminum, this bung balances weight savings with adequate strength for moderate-pressure applications typical in custom automotive and aerospace fabrication. The natural (unfinished) aluminum surface accepts welding without special surface preparation and can be painted or anodized post-installation for corrosion resistance in harsh environments.

This fitting is purpose-built for fabricators, race engine builders, and systems integrators who require a permanent fluid-system port in custom-built applications. Unlike quick-disconnect or threaded insert solutions, weld-on bungs eliminate the risk of fitting separation under vibration or pressure cycling, making them the standard choice in high-performance motorsports, experimental aircraft systems, and dedicated racing fuel systems. The compact 0.06-pound weight and modest dimensions make integration into tight engine bays and custom manifolds straightforward.