6AN to M18x1.5 AN/JIC Flare Inverted

The 6AN to M18x1.5 AN/JIC Flare Inverted fitting from REDHORSE PERFORMANCE is a critical adapter for high-performance fuel and fluid system builds where metric and AN-standard components must interface seamlessly. This inverted flare design eliminates the need for bulky adapters or custom fabrication, making it indispensable for engine swaps, turbo fuel system upgrades, and competition-level vehicle modifications. Whether you're routing fuel lines around tight engine bays or connecting modern metric fuel rails to classic AN-line infrastructure, this adapter solves a real problem that impacts both functionality and safety.

The 6AN to M18x1.5 AN/JIC Flare Inverted fitting features precision-machined construction with an inverted flare seat that creates a metal-to-metal seal rated for fuel system pressures and temperatures common in turbocharged and high-output applications. The 6AN inlet (3/8-inch ID equivalent) connects standard braided stainless or rubber fuel lines, while the M18x1.5 metric outlet threads directly into modern fuel components without requiring sleeves or adapters. This compact design—measuring 2.8 inches in length and weighing just 0.07 pounds—keeps weight down and saves valuable engine bay real estate, critical considerations in weight-sensitive builds and race platforms.

Mechanics and engine builders tackling LS-swap fuel system conversions, import turbo builds, and fuel rail relocation projects will find this fitting essential for maintaining system integrity and eliminating leak points. The inverted flare joint resists vibration loosening better than traditional JIC adapters, a proven advantage in high-vibration environments. Installation requires standard AN and metric wrenches; apply thread sealant to the M18x1.5 side and torque securely to OEM specifications for your fuel component. Compatible with all -6AN braided lines and any metric M18x1.5 threaded fuel system component.