Straight Adapter Fitting #12 x 1/2 MPT Black

The Straight Adapter Fitting #12 x 1/2 MPT Black from FRAGOLA is a critical component for any serious custom fuel system or hydraulic line build. This adapter bridges two different thread sizes—a #12 AN (7/16"-20 UNF) port and a 1/2" male pipe thread (MPT)—making it indispensable when integrating OEM fuel rails, carburetors, or pressure-regulated systems into modern performance platforms. Whether you're converting a classic engine bay to EFI, upgrading fuel delivery on a supercharged application, or fabricating a custom cooling or brake line circuit, this straight fitting ensures leak-free connections without requiring reducer blocks or multiple adapters.

Manufactured by FRAGOLA, a trusted name in motorsports plumbing for over four decades, this straight adapter is precision-machined from aluminum or ductile iron and finished in satin black to resist corrosion in under-hood environments. The #12 AN (7/16"-20) female inlet accepts industry-standard AN hose fittings and crimp-style adapters, while the 1/2" MPT outlet threads directly into NPT-threaded ports on fuel pumps, filter heads, or manifold blocks. The straight geometry eliminates flow turbulence compared to 90-degree elbows, reducing pressure drop—critical in high-flow fuel systems or when stacking multiple filters and regulators. At just 0.08 lbs, the compact 4.15-inch length fits tight engine bays without requiring rerouting of hoses or lines.

This fitting is ideal for fuel system fabricators, hot rodders, and performance builders working on LS-swaps, carbureted-to-fuel-injection conversions, or vintage race car restorations. It integrates seamlessly into both aluminum and steel line circuits and works equally well in fuel, oil, coolant, or brake applications where NPT male threads meet AN line requirements. Verify thread port compatibility before purchase—ensure the receiving port is 1/2" NPT and the supply line uses #12 AN (7/16"-20) connectors. Pair with appropriate hose, PTFE tape, and thread sealant for maximum reliability under pressure and heat cycles.