Bulkhead Nut -3AN

The Bulkhead Nut -3AN from VIBRANT PERFORMANCE is a precision aluminum fitting component designed for high-performance fuel, oil, and coolant line systems. This black anodized nut serves as the securing element in bulkhead-style threaded connections, commonly found in custom automotive, motorsports, and racing applications where reliability and leak-free performance are non-negotiable. As part of the AN (Army Navy) standardized fitting family, this component ensures compatibility across professional fluid line assemblies.

Manufactured from lightweight aluminum and finished with black anodize coating, the Bulkhead Nut -3AN delivers corrosion resistance and durability in demanding underhood environments. The anodized surface protects against oxidation while maintaining a professional appearance in visible engine bay installations. The 3AN designation indicates compatibility with 3/16-inch tube sizes, a critical specification for proper thread engagement and seal integrity. Vibrant Performance's engineering ensures precise tolerances that work seamlessly with matching AN bulkhead fittings and adapter components, preventing vibration-induced loosening and fluid seepage in high-vibration applications.

Engine builders, fabricators, and enthusiasts trust VIBRANT PERFORMANCE fittings for custom fuel injection systems, turbo coolant lines, and bespoke oil circulation setups. This nut pairs with 3AN bulkhead fittings and requires standard 3/16-inch tubing to complete the assembly. Installation is straightforward—hand-tighten firmly, then torque to specification using a wrench on the nut's hex head. Whether you're assembling a race engine or restoring a classic with modern fuel delivery, having quality AN hardware ensures your system holds pressure and performs reliably across thousands of heat cycles and vibration events.