EVIL ENERGY 6AN to M16 x1.5 Adapter — 2PC Aluminum 37° Flare with NBR O‑Ring, 1500 PSI

EVIL ENERGY's 6AN male flare to M16 x 1.5mm male adapter is a durable aluminum alloy fitting designed to join AN 6 flare lines to M16 x 1.5 metric connections with a 37° flare and an O-ring seal.

This two-piece adapter converts between a 6AN (9/16-18 UNF) flare connection and a metric M16 x 1.5 male thread, letting you integrate American-style AN hoses with metric ports commonly found on transmission coolers, fuel systems, and aftermarket plumbing. Machined from 6061-T6 aluminum and fitted with an NBR rubber O-ring, the adapters are built for automotive fluid-routing applications and rated for typical workshop operating ranges.

How does this adapter create a leak-resistant connection?

The adapter uses a dual sealing approach: the AN side seals by engaging a 37° flare, while the metric side seals against an O-ring seated in the thread. Proper torque and a correctly sized O-ring ensure a reliable mechanical and elastomeric seal without the need for additional sealants. Always inspect the O-ring for nicks or wear before installation to maintain sealing integrity.

• 37° flare interface on the 6AN side for metal-to-metal seating
• M16 x 1.5 male thread with NBR O-ring for elastomeric sealing
• Assembly requires correct torque and clean mating surfaces
• Replace O-ring periodically if exposed to harsh chemicals or heat

What specifications and limits should I expect?

These adapters are machined from 6061-T6 aluminum and include a nitrile (NBR) rubber O-ring. They are rated for a working pressure up to 1500 PSI and a service temperature range spanning roughly -4°F to 212°F (-20°C to 100°C), matching many common automotive fluid system conditions. Use them within these limits for long service life.

• Thread sizes: 6AN (9/16-18 UNF) to M16 x 1.5 metric
• Material: 6061-T6 aluminum alloy body
• Seal: NBR rubber O-ring on metric side
• Working pressure: up to 1500 PSI; temperature: -4°F to 212°F

Where are these adapters commonly used and how do they help installations?

These fittings bridge AN hoses and metric ports found on many transmission coolers, fuel filters, and aftermarket plumbing components. They allow installers to reuse existing hoses or connect systems without redoing entire lines, saving time and reducing the need for custom hose end fabrication. The compact, machined design fits tight engine-bay spaces where flexibility and reliability matter.

• Connects AN 6 lines to M16 x 1.5-threaded ports
• Ideal for transmission coolers, fuel lines, filters, and oil circuits
• Saves time when adapting mixed-standard components
• Two-piece pack helps outfit multiple connection points or spares

How should I install and maintain these adapters for best performance?

Installation requires cleaning mating surfaces, ensuring the O-ring is seated and undamaged, and tightening to appropriate torque—avoid over-tightening the aluminum body. Inspect the O-ring and threads regularly and replace the O-ring if it shows wear, swelling, or chemical damage. If used in aggressive environments, consider compatible O-ring materials and periodic checks.

• Clean threads and flare surfaces before assembly
• Check that the NBR O-ring is intact and properly seated
• Tighten to recommended torque; avoid overtightening aluminum parts
• Replace O-ring as preventive maintenance every service interval

Who is this for? The EVIL ENERGY 6AN male flare to M16 x 1.5mm male adapter 2-pack suits professional mechanics, motorsport fabricators, and DIY automotive enthusiasts who need to join AN 6 hoses to metric-threaded ports without custom machining. It’s particularly useful when retrofitting transmission coolers, connecting fuel system components, or creating mixed-standard plumbing in compact engine bays. Choose these adapters when you want a lightweight, corrosion-resistant aluminum fitting with a dual-seal arrangement for typical automotive fluid pressures and temperatures.