EVIL ENERGY 6AN to 5/8-18 Inverted Flare Adapter Set — 4pc Black Anodized 6061-T6 Aluminum Straight

EVIL ENERGY 6AN male to 5/8 x 18 inverted flare straight adapter converts AN hose ends to 5/8-18 inverted-flare ports with durable 6061-T6 aluminum construction — sold as a set of four.

This four-pack of straight fittings bridges standard 6AN male hose ends to components that use 5/8-18 inverted flare threads, commonly found in fuel and cooler systems. Each adapter is machined from aircraft-grade 6061-T6 aluminum, anodized in black for corrosion resistance and a professional finish. Built to handle typical automotive fluid pressures and temperatures, these adapters are a compact, reusable solution for custom plumbing, repairs, and retrofits.

How does this adapter join AN hoses to inverted flare ports?

The adapter uses a 6AN male coupler that mates with AN hoses and a 5/8-18 inverted flare threaded end to engage inverted-flare ports. The AN side seals on a 37-degree flare while the threaded side engages the mating fitting for a reliable mechanical connection. Installation requires proper hand-tightening and final torque to the manufacturer’s recommendation.

• 6AN male coupler thread size: 9/18-18 UNF
• 5/8 x 18 inverted flare threaded end for standard flare ports
• Sealing achieved via 37° AN flare geometry
• Sold as a set of 4 straight adapters for multiple runs

What pressure and temperature limits should I expect?

These adapters are rated for typical automotive fluid systems with a working pressure of up to 1500 PSI and a wide operating temperature range. The metal construction and anodized finish maintain integrity across hot engine bays and cooler environments. For extreme high-pressure or unusual chemical service, confirm compatibility with system requirements before use.

• Working pressure: 1500 PSI
• Working temperature range: -40°F to 250°F (-40°C to 121°C)
• Suitable for typical fuel lines, oil coolers, and transmission cooler plumbing

What materials and finish are used, and why does that matter?

Each adapter is CNC-machined from 6061-T6 aluminum, chosen for its strength-to-weight ratio and corrosion resistance. The black anodized surface improves wear resistance and protects the aluminum from oxidation while providing a low-profile look in engine bays. The material and finish also make the fittings lightweight compared with steel alternatives, reducing stress on hoses and mounting points.

• Material: Aluminum alloy 6061-T6 for durability and light weight
• Finish: Black anodized surface for corrosion protection
• Precise machining for consistent thread engagement and flare sealing

How do I install these adapters safely in my vehicle?

Preparation and correct tightening are key: clean mating surfaces, inspect flares and threads, and apply the proper torque instead of overtightening. Use a backup wrench on the hose fitting to avoid twisting the hose, and check for leaks after initial pressurization. Replace any fittings that show damaged threads, deformed flares, or persistent leaks.

• Clean and inspect mating flares and threads before assembly
• Hand-start threads, then tighten to recommended torque; avoid over-torquing
• Pressurize system and inspect connections for leaks

Who is this for: These adapters are designed for DIY mechanics, fabricators, and professional shops working on fuel, oil, or cooler plumbing that require converting AN hose ends to inverted flare ports. They suit custom plumbing projects, repairs on older vehicles with inverted-flare fittings, and anyone needing a lightweight, corrosion-resistant connector for moderate-pressure automotive systems. If you handle high-pressure specialty fluids or require SAE-specific certifications, verify compatibility before installation.