EVIL ENERGY 6AN to 3/8" NPT Adapter 6AN

This aluminum AN6 to 3/8" NPT straight adapter helps secure fluid lines in engines and systems where a durable seal matters. It suits projects that need a compact joiner for fuel, coolant or steering lines, and it reduces the hassle of mismatched fittings by converting a 6AN male flare to a 3/8" NPT thread.

Key points

Compact and practical, this adapter is machined from 6061-T6 aluminum with an anodized black finish for corrosion resistance and a cleaner look. The AN side seals on a 37-degree flare, while the NPT side relies on 60-degree tapered threads, so sealing tape or sealant is recommended to avoid leaks. If you prioritize quick installation and a low-weight joiner, this piece works well, and if you prefer a metal adapter with corrosion protection, the anodized surface helps maintain appearance and function.

Product specs

• Name: EVIL ENERGY 6AN Male Flare to 3/8" NPT Adapter
• Material: Aluminum alloy 6061-T6
• Thread sizes: 6AN (9/16-18 UNF) and 3/8" NPT
• Sealing: 37-degree flare on AN side, 60-degree tapered NPT threads
• Finish: Anodized black

What stands out

The adapter focuses on a straightforward conversion between common automotive fittings, keeping the profile short so routing and tight spaces are easier to manage. It comes as a two-piece set which helps when you need a spare or are working on multiple lines. Note that the NPT side is tapered and not self-sealing by design, so using PTFE tape or a compatible sealant is a practical step to ensure leak-free service, according to the product notes.

How to use it

Install the AN flare connection first, tightening to the recommended torque for your hose end and fitting type, then apply thread sealant or PTFE tape to the NPT male threads before threading into the receiving port. Check for leaks after pressure testing the system and retighten if needed. Keep in mind light fittings and thin-wall hoses may need backing support to avoid stress at the joint.