Aluminum Fitting -6AN x 5/18-18 O-ring

The Aluminum Fitting -6AN x 5/8-18 O-ring is a precision adapter engineered for high-performance hydraulic and fuel system applications. This straight-port connector transitions from a male 6 AN (AN6) port to a 5/8-18 inch male O-ring port, making it essential for custom cooling systems, fuel distribution networks, and pressurized fluid transfer where reliability and leak-free performance are non-negotiable. Whether you're building a custom cooling loop, upgrading a fuel system, or integrating modular components, this adapter serves as the critical junction point between incompatible port sizes.

Constructed from durable aluminum and finished in a natural (uncoated) state, this fitting delivers excellent corrosion resistance while maintaining a lightweight profile—critical for performance-oriented applications where mass matters. The 6 AN male thread accommodates standard -6 hose fittings and adapters widely used in motorsports and racing applications, while the 5/8-18 inch male O-ring port ensures compatibility with larger industrial and commercial systems. O-ring sealing technology eliminates the need for thread sealant tape and provides superior vibration resistance compared to traditional pipe thread connections, reducing the risk of seepage in high-vibration or high-pressure environments.

This fitting is ideal for custom engine builders, cooling system integrators, and performance enthusiasts who demand precision engineering from every component. Installation is straightforward—hand-tighten the O-ring port with a wrench, ensuring the O-ring seats properly against the receiving port for a secure, leak-proof seal. The compact footprint (2.8 x 1.3 x 4.2 inches) and minimal weight (0.06 lbs) make it suitable for space-constrained engine bays and aftermarket cooling applications. Always verify port compatibility before installation and consider DERALE's full line of fittings and adapters for complete system compatibility.