EVIL ENERGY AN6 Male Flare to 1/4" NPT Straight Adapter 4-Pack — 6061-T6 Aluminum, Black Anodized

This four-piece set provides a compact, corrosion-resistant transition between an AN6 (9/16-18 UNF) flare fitting and a 1/4" NPT pipe thread. Machined from 6061-T6 aluminum and finished with an anodized black surface, these adapters are built to be lightweight and suited to automotive and industrial fluid routing where flare fittings and tapered pipe threads must join.

What materials and thread standards does this adapter use?

The body is CNC-machined from 6061-T6 aluminum for good strength-to-weight ratio and corrosion resistance. The AN side is a standard 37° flare with 9/16-18 UNF threads while the pipe side uses 1/4" NPT tapered threads that seal by thread deformation.

• Body: 6061-T6 aluminum, black anodized finish for wear and corrosion resistance.
• AN side: 6AN (9/16-18 UNF) 37° male flare seating angle.
• NPT side: 1/4" NPT tapered male threads, 60° thread form sealing.
• Pack: Sold as a set of 4 straight adapters.

How do I install these adapters without leaks?

Because NPT threads seal by taper and thread deformation, use a quality pipe thread sealant or PTFE tape on the NPT male threads before assembly. Hand-start the threads, then tighten to suitable torque; avoid over-tightening aluminum components.

• Apply PTFE tape or NPT liquid sealant to the male NPT threads only.
• Hand-thread first to prevent cross-threading, then use a wrench—don’t over-torque.
• Inspect the AN flare seat for damage and ensure a clean mating surface.
• Pressure-test the assembly after installation to confirm leak-free operation.

Where are these adapters typically used?

They’re commonly used in fuel, coolant, power steering, brake reservoirs (where compatible), and other fluid-transfer systems that mix AN flare lines with NPT pipe fittings. Use them in low- to moderate-pressure applications where aluminum is suitable.

• Automotive fuel and return lines for carburetors and EFI systems.
• Cooling system fittings, bypass lines, and remote filter setups.
• Power steering feed or return connections where AN meets NPT plumbing.
• Workshop or industrial plumbing linking braided AN hose to pipe-threaded components.

Are there compatibility or maintenance considerations?

Aluminum fittings are lightweight and corrosion-resistant but can be softer than steel, so avoid repeated over-tightening. Confirm chemical compatibility for the fluids in your system—aluminum is suitable for many automotive fluids but check manufacturer guidance for specialty chemicals.

• Do not mix dissimilar metals without proper isolation to prevent galvanic corrosion.
• Replace damaged or deformed flare fittings rather than attempting to reface them.
• Reapply thread sealant if the NPT connection is disassembled and reinstalled.
• Inspect periodically for leaks, especially after initial installation and thermal cycling.

Who is this for: This 4-pack from EVIL ENERGY targets DIY mechanics, race-shop fabricators, and garage professionals who need a reliable, lightweight adapter to join AN6 37° flare hoses to 1/4" NPT ports. It’s ideal when you need a compact, anodized aluminum transition piece for fuel, cooling, or other low- to moderate-pressure fluid systems where weight and corrosion resistance matter.