EVIL ENERGY 6AN Male Flare to M12 x 1.25mm Adapter — 2PC Aluminum, NBR O‑Ring, 1500 PSI

Compact 6AN male flare to M12 x 1.25mm male metric adapter — a 2-piece aluminum alloy fitting that converts AN flare lines to metric o-ring connections for fuel, oil, and cooler plumbing.

This pair of EVIL ENERGY adapters lets you join a 6AN (9/16-18 UNF) flare male connection to a metric M12 x 1.25mm male port using a reliable o-ring seal. Machined from 6061-T6 aluminum and fitted with NBR rubber o-rings, these fittings are built for typical automotive and motorsport fuel and fluid routing where a compact, high-pressure connection is required. They suit transmission coolers, fuel filters, oil lines and other systems that require converting between AN flare and metric threaded ports.

How does this adapter maintain a leak-resistant connection?

The adapter combines a 37° AN flare sealing surface with an NBR o-ring on the metric side for dual-style sealing: metal-to-metal flare integrity and resilient o-ring compression. That arrangement ensures a tight seat on the AN side while the o-ring protects the metric port from vibration-induced leaks.

• 37° flare face provides proven metal sealing for AN hoses and fittings
• NBR o-ring on M12 side cushions and seals the thread interface
• Precision machining reduces misalignment and improves sealing contact

What pressures and temperatures can these fittings handle?

These adapters are rated for service up to 1500 PSI and perform across a wide temperature span suitable for most automotive fluid systems. The materials and o-ring selection allow stable operation from cold starts to elevated engine bay temperatures.

• Working pressure up to 1500 PSI for high-demand fluid lines
• Operating temperature range: -4°F to 212°F (-20°C to 100°C)
• Suitable for typical fuel, oil and transmission fluid environments

What materials and build quality should I expect?

EVIL ENERGY makes these adapters from 6061-T6 aluminum for strength with low weight, while using NBR rubber o-rings for reliable sealing and chemical compatibility with many fluids. The visible finish and threads are machined to industry tolerances to ensure repeatable fitment.

• 6061-T6 aluminum body: lightweight, corrosion-resistant, and strong
• NBR o-ring: compatible with common automotive fuels and oils
• Thread sizes: 6AN (9/16-18 UNF) and M12 x 1.25mm metric

How and where will these adapters be used in a vehicle?

Use the adapters whenever you need to mate AN flare hoses or hard lines to M12 x 1.25mm male ports — common on aftermarket coolers, filters and some factory fittings. They are compact enough for tight engine compartments and robust enough for performance applications when installed correctly.

• Transmission oil coolers and oil lines with metric ports
• Fuel filters or pump outlets requiring AN-to-metric conversion
• Custom plumbing on race or street vehicles where space and pressure matter

Who is this for? These EVIL ENERGY adapters are intended for mechanics, tuners, fabricators and DIY enthusiasts who need a dependable, space-saving AN-to-metric conversion for fuel, oil or transmission systems. If you work on performance or retrofit applications that combine AN hoses with metric ports, want durable aluminum fittings, and need a small parts solution rated for elevated pressures and temperatures, this 2-piece set is designed to simplify plumbing and reduce leak points when installed with the correct torque and compatible hoses.