EVIL ENERGY 6AN Female to 3/8" Compression Hardline Adapter, 2 PCS — Aluminium Body & Brass Ferrule

EVIL ENERGY 6AN female flare to 3/8" compression hardline fitting (2 pcs) converts a 6AN threaded flare connection to a 3/8" hardline with a brass ferrule and aluminum-alloy body.

This two-piece adapter lets you join a 6AN female flare line to a 3/8" outside-diameter hardline quickly and securely. Designed for fuel-system and engine plumbing work, the fitting uses a 37° flare seating angle on the AN side and a compression ferrule on the hardline side. The body is aluminum alloy while the ferrule is brass, giving a balance of light weight and reliable compression sealing. Before ordering, verify that your rigid tubing is stainless steel or aluminum and measures 3/8" OD.

How does the adapter create a leak-resistant connection?

The AN side seals by mating the 6AN female thread and 37° flare face, while the compression side uses a brass ferrule that bites and compresses onto the hardline tubing. Proper torque on the fittings produces a durable mechanical seal without requiring sealants. Follow recommended seating torque and confirm tube material compatibility for the best result.

• 6AN female thread size: 9/16" UNF with 37° flare seat.
• Brass ferrule compresses onto 3/8" OD hardline for mechanical sealing.
• Aluminum alloy body reduces weight while resisting corrosion in many environments.
• No thread sealant needed when assembled correctly.

Will this work with my vehicle's fuel or oil lines?

These fittings are commonly used in fuel-delivery, return lines, and many engine-modification plumbing tasks where a rigid line needs to connect to an AN hose or component. They are intended for use with stainless steel or aluminum hardline only; soft or polymer tubing is not compatible. Always verify pressure and fluid compatibility with your system before installation.

• Common use: fuel systems, return lines, engine dress-up plumbing.
• Compatible hardline materials: stainless steel and aluminum (3/8" OD).
• Not for soft, rubber, or polymer tubing without proper adapters.
• Check system pressure ratings and fluid compatibility first.

How do I install the 6AN female to 3/8" compression fitting?

Cut the hardline square and deburr the end, slide the brass ferrule over the tube, insert the tube fully into the adapter body, and then tighten the compression nut to compress the ferrule. On the AN side, thread and tighten the 6AN connection to the mating male fitting until the 37° flare seats. Use appropriate wrenches and avoid over-torquing to protect threads and flare surfaces.

• Prepare tube: square cut and deburr for correct ferrule compression.
• Slide ferrule, insert tube fully, then tighten compression nut evenly.
• Tighten AN connection until the 37° flare seats; use proper tools.
• Inspect for leaks after initial pressure-up and re-torque if needed.

What specifications should I confirm before buying?

Measure your rigid tubing to confirm a 3/8" outside diameter and ensure the mating AN component is a 6AN female with 9/16" UNF thread. Confirm the hardline material is stainless steel or aluminum; this fitting is not designed for copper, soft plastics, or rubber lines. Also consider the operating fluid and pressure range of your application to ensure the materials and design are appropriate.

• Tube OD requirement: 3/8" (measure before purchase).
• AN side: 6AN female, 9/16" UNF thread, 37° flare seating angle.
• Materials: aluminum alloy body, brass ferrule.
• Quantity: two fittings per package.

Who this is for: Mechanics, fabricators, and enthusiasts who routinely adapt rigid hardlines to AN hose assemblies will find these EVIL ENERGY adapters useful for fuel-delivery retrofits, custom engine plumbing, and performance upgrades. If you work with stainless or aluminum hardlines, need a compact AN-to-hardline transition, and prefer lightweight, corrosion-resistant fittings, this two-pack provides a practical, ready-to-install option. Not recommended if your tubing is non-metallic or if your system requires certified high-pressure fittings beyond general automotive use.