AN to NPT 45 Degree #4 x 1/8

The AN to NPT 45 Degree #4 x 1/8 adapter from Triple X Race Components is a precision hydraulic and pneumatic fitting engineered for high-performance fuel, coolant, and air systems in racing and industrial applications. This adapter bridges two different thread standards—AN (Army-Navy) and NPT (National Pipe Thread)—allowing seamless integration between components that would otherwise be incompatible. Whether you're building a custom fuel system, modifying cooling lines, or assembling pressurized air circuits, this fitting provides a reliable connection point without costly rework or custom fabrication.

Manufactured from aluminum and finished in black anodize, the AN to NPT 45 Degree #4 x 1/8 combines lightweight design with corrosion resistance and durability in demanding environments. The 45-degree orientation allows for tight routing and space-constrained installations common in engine bays and chassis frames. The #4 AN male port (0.25-inch) connects to standard AN fittings and hoses, while the 1/8-inch NPT male port accommodates standard pipe thread components used in gauges, valves, and manifolds. Anodized aluminum construction ensures minimal weight penalty while maintaining structural integrity under vibration and thermal cycling.

This fitting is ideal for fabricators, mechanics, and engine builders who require flexible system design without adapter stacking or custom machining. Common applications include fuel pressure gauge installations, coolant line branching, turbo boost sensing, and nitrous system plumbing. The compact 1.95 x 0.65 x 2.8-inch profile and minimal 0.03-pound weight make it suitable for weight-sensitive racing platforms. Installation requires standard thread sealant or PTFE tape on the NPT port; AN fittings typically use dynamic O-ring sealing for a leak-free, reusable connection.