Single Male Banjo Adaptr Bolt M12x1.25 to -4AN

The Single Male Banjo Adapter Bolt M12x1.25 to -4AN by VIBRANT PERFORMANCE is a precision hydraulic fitting adapter engineered for fuel system, oil line, and brake fluid routing in custom engine builds and high-performance vehicle modifications. This adapter bridges metric banjo-style connections to AN (Army-Navy) standard plumbing, making it indispensable for engine swaps, fuel system upgrades, and turbocharger installations where OEM and aftermarket components use incompatible thread standards. Whether you're fabricating a custom fuel rail, integrating a remote oil filter setup, or rerouting coolant lines during a motor conversion, this M12x1.25 to -4AN adapter ensures leak-free, pressure-rated connections without modification to existing fittings.

Manufactured from aerospace-grade aluminum or stainless steel (depending on application variant), the banjo adapter features a precisely machined male bolt thread of M12x1.25—the metric equivalent of a common OEM fuel system interface—and converts it to -4AN (1/4-inch AN) port sizing for compatibility with aftermarket hoses, filters, and manifolds. The compact 3.54-inch length and lightweight 0.04-pound profile minimize installation footprint in tight engine bays while maintaining full structural integrity under fuel system pressure and thermal cycling. The banjo design incorporates a sealing washer configuration that distributes clamping force evenly, preventing damage to soft copper crush washers and ensuring repeatable, reliable seals across multiple installation cycles.

This adapter is ideal for engine builders, suspension fabricators, and performance shops executing fuel system conversions on Japanese imports, domestic muscle cars, and European platform swaps where metric OEM banjo ports must mate with standardized -4AN plumbing systems. Installation is straightforward—simply thread the M12x1.25 bolt into the OEM banjo port, torque to specification, and attach your -4AN hose with a standard AN fitting and AN wrench. Verify your line pressure rating (typically 40–60 PSI for fuel systems) and confirm aluminum or stainless compatibility with your fluid type before purchase; the adapter performs identically whether routing fuel, oil, or coolant in street, road race, or drag racing applications.