8an x 1/4-MPT Straight Adapter Fitting - Steel

The 8AN x 1/4-MPT Straight Adapter Fitting from FRAGOLA is an essential hose coupling component designed for fuel, oil, and coolant system routing in high-performance and custom automotive applications. This straight adapter bridges AN (Army-Navy) port sizing to standard pipe thread connections, making it indispensable when integrating aftermarket fuel systems, turbo oil feeds, or custom cooling loops into vehicles with mixed port standards. Whether you're building a fuel-injected engine swap, upgrading to a high-flow fuel system, or routing oil lines to a remote filter housing, this adapter ensures leak-free, secure connections between incompatible thread types.

FRAGOLA's steel construction delivers reliable durability under pressure and temperature cycling, critical for fuel and oil applications where vibration and thermal expansion demand superior material strength. The 8AN port accepts standard -8 hose with JIC or AN fittings, while the 1/4-inch male pipe thread (MPT) end accepts common metric and imperial fittings found on factory components, aftermarket manifolds, and block-mounted ports. Straight-body geometry minimizes turbulence and pressure drop—important factors when fuel delivery or oil pressure consistency affects engine performance and reliability. The compact 3 x 1 x 5-inch footprint allows installation in tight engine bay spaces without requiring adapter chains that introduce leaks or vibration points.

This adapter is ideal for mechanics and fabricators performing engine conversions, turbocharger installations, or full fuel system rebuilds where OEM ports don't match modern AN-size hose standards. It pairs seamlessly with FRAGOLA's complete range of hose fittings, bulkhead adapters, and block-off plates, supporting both carbureted and fuel-injected engine builds across domestic and import platforms. Installation requires no special tools—hand-tightening followed by a quarter-turn with a wrench ensures proper seating on the pipe thread side. Always use appropriate thread sealant (PTFE tape or pipe dope) on the MPT end to guarantee leak-free operation under full operating pressure.