EVIL ENERGY 6AN Male to 3/8-inch Quick-Disconnect Push-On Fitting, 1500 psi 6061-T6 Aluminium

This compact adapter converts a 6AN (9/16-18UNF) male thread to a 3/8" spring-lock push-on female connection. Built from 6061-T6 aluminum with a plastic spring-lock sleeve and a 37° sealing flare, it’s made to perform in automotive fuel rails, LS swaps, transmission coolers, return lines and inline sensors. The fitting is rated to 1500 psi and works across a wide temperature range, making it a durable option for many under-hood and fluid-transfer applications.

How does this fitting create a leak-resistant connection?

The connector uses a 37° flare seal at the 6AN interface and a spring-lock mechanism on the 3/8" side to reduce the risk of leaks. The mating surfaces are machined to align the flare and the push-on sleeve for consistent sealing under pressure.

• 37° flare sealing angle for tight metal-to-metal contact
• Precision-machined 9/16-18UNF 6AN thread for reliable torque
• Spring-lock female sleeve secures push-on hose fittings quickly
• Single-piece sealing geometry minimizes potential leak paths

What pressure and temperature limits should I expect?

This adapter is specified for working pressures up to 1500 psi and tolerates temperatures from -40°F to 176°F, covering most automotive fluid system conditions short of extreme thermal environments.

• Working pressure: 1500 psi rating for high-pressure circuits
• Operating temperatures: -40°F to 176°F for general automotive use
• Suitable for common fuels and transmission fluids within temperature limits
• Not intended for extreme high-heat exposure beyond specified range

What materials are used and why do they matter?

The body is machined from aluminum alloy 6061-T6 for strength, light weight and corrosion resistance, while the spring-lock sleeve is plastic to allow smooth push-on operation and secure retention. These choices balance durability with ease of use for repeated connections.

• 6061-T6 aluminum body — strong, lightweight and corrosion-resistant
• Plastic spring-lock sleeve — smooth engagement and reliable hold
• Metal flare seat for consistent sealing under torque and pressure
• Manufactured tolerances suited for automotive fluid fittings

How will I use this fitting in a vehicle build?

Install the 6AN male thread into a compatible flare port, then push the 3/8" hose with a matching spring-lock end into the female sleeve until it engages. It’s commonly used for fuel rails, returns, transmission cooler lines and inline sensors where a quick-disconnect is helpful for servicing.

• Thread into 6AN (9/16-18UNF) flare ports on rails or adapters
• Push 3/8" spring-lock hoses into the female side until locked
• Use in LS swaps, fuel systems, coolers, and sensor lines for fast access
• Ship as a single connector — hoses and additional fittings are not included

Who is this for? This fitting is aimed at automotive builders, mechanics, and enthusiasts who need a compact, high-pressure quick-disconnect for fuel or fluid systems. It suits projects where a robust 6AN connection must interface with 3/8" spring-lock hoses, especially in engine swaps, retrofit cooling circuits, or custom fuel-return configurations. If you require a heavy-duty, service-friendly adapter rated to 1500 psi with reliable 37° flare sealing, this EVIL ENERGY connector is designed for that role.