Adapter Fitting -4 to 1/8 NPT 90 Deg 10pk

The Adapter Fitting -4 to 1/8 NPT 90 Deg 10pk from ALLSTAR PERFORMANCE is an essential hydraulic and fuel system component for custom engine builds, performance modifications, and precision plumbing applications. Whether you're constructing a fuel line system, upgrading brake hydraulics, or integrating custom cooling circuits, these 90-degree adapters provide reliable port conversion between -4 AN (5/16-24 UNF) male threads and 1/8 NPT (National Pipe Thread) female ports. Mechanics and fabricators rely on bulk 10-packs like this to minimize downtime and ensure consistent fitment across multiple vehicle projects.

These 90-degree adapter fittings are precision-engineered aluminum or steel construction, offering lightweight durability without sacrificing structural integrity under pressure. The -4 AN (5/16" diameter) to 1/8 NPT conversion allows seamless integration between modern motorsport-spec AN fittings and legacy NPT-threaded components, including gauges, sensors, and manifold ports. The 90-degree elbow design eliminates bulky hose routing, reduces pressure drop, and saves critical engine bay space—crucial in tight engine compartments where straight adapters create installation conflicts. NPT threads are tapered, providing mechanical seal reliability without separate O-rings, though proper thread sealant application is recommended for high-vibration environments.

Drag racers, circle track competitors, and street performance builders benefit from purchasing this 10-pack, as multiple adapters accommodate fuel distribution blocks, nitrous oxide systems, telemetry sensor ports, and intercooler plumbing simultaneously. Compatibility spans LS-series engines, small-block Chevrolet builds, Ford crate motor conversions, and any custom application requiring -4 AN hose termination to NPT-threaded ports. Installation requires basic line-wrench technique and thread sealant (PTFE tape or anaerobic compound); these adapters are reusable across projects, making them a cost-effective addition to any fabricator's toolkit.