AN To NPT 45 Degree -4 x 3/8in

The ALLSTAR PERFORMANCE AN to NPT 45 Degree -4 x 3/8in adapter (ALL 49537) is a precision hydraulic and pneumatic fitting designed to connect AN (Army-Navy) male ports to NPT (National Pipe Thread) male ports at a 45-degree angle. Constructed from aluminum and finished in black anodized coating, this adapter provides reliable fluid or gas transfer in high-pressure applications while resisting corrosion in demanding environments. The 45-degree orientation allows for space-efficient routing of lines in engine bays, fuel systems, and brake circuits where straight connections would create clearance conflicts.

The -4 AN port accepts standard 1/4-inch AN hose fittings, while the 3/8-inch NPT port threads directly into NPT-equipped components without additional adapters. Black anodized aluminum construction balances lightweight design with durability, making it suitable for motorsports, hydraulic brake systems, fuel delivery lines, and custom fluid management setups. The 45-degree angle design reduces pressure drop compared to 90-degree elbows and minimizes turbulence, which is critical in fuel-injection systems and precision cooling circuits where flow characteristics matter.

This fitting serves enthusiasts and technicians building custom fuel systems, upgrading brake lines, or integrating aftermarket hydraulic components into vehicles where OEM connections use mixed thread standards. The anodized finish provides a professional appearance while offering protection against oxidation in engine bay environments. Common applications include drag racing fuel systems, classic car restorations, hydraulic brake conversions, and off-road vehicle modifications where component sourcing requires mixing SAE AN and NPT standards.

ALLSTAR PERFORMANCE is recognized within the automotive performance market for producing accessible adapter fittings and connectors that meet industry tolerances. This adapter is sold as a single unit and is commonly stocked by shops supporting race vehicles, restoration projects, and engineered custom builds where precision fittings and leak-free connections are non-negotiable.