Bulkhead Nut #3 Black

The Bulkhead Nut #3 Black by FRAGOLA is an essential fastening component designed for high-performance fuel system assemblies, hydraulic lines, and precision engine modifications. This adapter fitting serves as the securing nut in bulkhead connector configurations, where reliability under pressure is non-negotiable. Whether you're building a custom fuel delivery system for a turbocharged engine swap, installing remote-mounted fuel cells, or upgrading your vehicle's brake or coolant infrastructure, the bulkhead nut provides the mechanical foundation that keeps critical fluid systems sealed and secure.

Engineered with precision threads and manufactured to OEM standards, FRAGOLA's bulkhead nut delivers consistent clamping force across repeated assembly and disassembly cycles. The black finish offers corrosion resistance in engine bays and underbody environments where moisture and road salt present ongoing threats to bare aluminum or steel fittings. Size #3 accommodates 1/4-inch nominal line applications—a common specification in fuel injection systems, remote filter mounts, and auxiliary cooling loops. The compact 0.01 lb weight and minimal profile ensure zero impact on weight distribution while maximizing clearance in tight engine compartments typical of modern performance builds.

Mechanics and fabricators rely on FRAGOLA bulkhead nuts during EFI conversions, fuel cell installations, and turbo system plumbing where vibration resistance and pressure integrity are critical. This component pairs seamlessly with matching FRAGOLA bulkhead connectors and AN-style adapters, ensuring full system compatibility without dimensional surprises. Installation requires basic hand tools and torque wrench verification—no specialized equipment necessary. Stock multiple sizes in your shop inventory for emergency repairs or custom projects that demand immediate turnaround without compromise to reliability or safety.