EVIL ENERGY 6AN Male to 3/8" & 5/16" Hardline Compression

This EVIL ENERGY adapter converts a 6AN male flare (9/16-18 UNF) to accept 3/8" and 5/16" hardline using a compression ferrule system. Machined from aluminum alloy with a brass ferrule and a 37° flared sealing face, it’s built to join stainless steel or aluminum rigid lines in automotive fuel delivery, engine plumbing, and performance modifications. Double-check tube diameters before installation to ensure a proper fit.

How does this adapter connect a 6AN system to hardline tubing?

The adapter uses a 37° flared AN male thread to mate with a female 6AN fitting while compressing a brass ferrule around the hardline tube for a leak-resistant seal. Installation requires inserting the pre-cut hardline into the ferrule and tightening the body to the specified torque for a secure joint.

• Thread: 6AN male 9/16-18 UNF for AN compatibility
• Hardline sizes accepted: 3/8" and 5/16"
• Sealing method: 37° flare face plus compression ferrule
• Materials: aluminum alloy body and brass ferrule for corrosion resistance

Will this adapter work with my hardline and fuel system?

It is intended specifically for rigid tubing made of stainless steel or aluminum; it is not designed for soft rubber hose or nylon lines. The adapter is suitable for fuel delivery, return lines, and other engine plumbing where a durable metal-to-metal connection is required.

• Compatible tubing: stainless steel or aluminum rigid hardline
• Typical applications: fuel lines, engine modifications, custom plumbing
• Not recommended for soft hoses or non-metallic tubing
• Measure tube OD to confirm 3/8" or 5/16" fit before ordering

What are the materials and how do they affect durability?

The adapter body is CNC-machined from aluminum alloy for light weight and corrosion resistance, while the ferrule is brass to provide a tough, conforming seal around the hardline. Together they balance strength, sealing reliability, and resistance to fuel-compatible corrosion in automotive environments.

• Body: aluminum alloy — lightweight and corrosion-resistant
• Ferrule: brass — malleable for tight compression sealing
• Sealing face: 37° flare for standardized AN connectivity
• Recommended use: fuel and fluid systems compatible with metal components

How should I prepare and install the fitting for best results?

Cut the hardline square, deburr the ID and OD, and slide the brass ferrule onto the tube before inserting it fully into the adapter. Tighten to recommended specs and test for leaks under pressure before returning the vehicle to service.

• Cut lines cleanly and deburr to avoid sealing issues
• Slide ferrule on, insert tube, then torque to spec
• Pressure-check the assembly before regular operation
• Only install on stainless steel or aluminum hardline

Who this is for: This EVIL ENERGY adapter suits mechanics, fabricators, and performance enthusiasts building or repairing metal fuel and fluid systems who need a compact, reliable transition from 6AN flare fittings to 3/8" or 5/16" rigid hardline. Choose this part when you require a lightweight, machined aluminum connector with a brass ferrule for dependable metal-to-metal seals in automotive or motorsport plumbing projects.