3AN Flare Cap Nut 2 Piece Black

The 3AN Flare Cap Nut 2 Piece Black from REDHORSE PERFORMANCE is a precision AN-standard hydraulic fitting component designed for high-performance fuel, oil, and coolant line applications in modified vehicles and racing engines. Whether you're building a custom fuel system for a turbocharged engine, upgrading cooling lines on a high-output street machine, or assembling a competition fuel cell, this two-piece cap nut delivers the reliability required in demanding automotive environments. The 3AN designation refers to the AN3 (JIC 37-degree) flare standard, making it compatible with industry-standard braided hose and hard-line tubing used across motorsports and performance automotive applications.

Constructed from durable materials with a black anodized or powder-coat finish, this two-piece assembly provides the mechanical advantage needed to achieve a leak-free seal without over-torquing delicate hose fittings or aluminum tubing. The 3AN flare standard uses a 37-degree JIC cone angle, which creates a metal-to-metal seal when the cap nut is tightened onto the flared end of your hose or line. The two-piece design separates the compression nut from the sealing surface, allowing for easier installation, removal, and adjustment during system development or maintenance. Black anodizing resists corrosion in engine bays, fuel tanks, and under-hood environments where moisture and heat accelerate oxidation.

This fitting is ideal for any mechanic or enthusiast fabricating custom fuel delivery systems, oil cooler circuits, intercooler piping, or radiator bypass lines on street rods, race cars, or high-horsepower engine builds. It pairs seamlessly with REDHORSE PERFORMANCE braided hose, flare tubing, and other AN-standard fittings to create reliable, professional-grade hydraulic systems. Installation requires a flared hose or tube end and a wrench sized for 3AN fittings; ensure proper torque specifications for your application to maintain system integrity under boost, high RPM, or extreme operating conditions.