#3 Bulkhead Nut - Steel 3/8-24

The FRAGOLA #3 Bulkhead Nut – Steel 3/8-24 (MPN 592403) is a precision-engineered fastener designed for high-performance fuel system and hydraulic line applications in custom automotive builds. This bulkhead nut serves as a critical sealing and securing component where transmission cooler lines, brake lines, fuel lines, and other fluid delivery systems connect through firewall or chassis penetrations. Whether you're building a street rod, race car, or restoring a classic with modern fuel injection, this nut provides the reliable clamping force and leak-free performance required in pressurized environments.

Constructed from durable steel with a 0.375-inch diameter and 24 threads per inch (TPI) specification, this bulkhead nut is engineered to withstand vibration, thermal cycling, and the pressure demands of modern fuel systems and transmission coolers. The 3/8-24 thread pitch is a standard size favored in aftermarket performance applications where precise fitment and repeatability are non-negotiable. FRAGOLA's manufacturing tolerances ensure consistent thread engagement and proper sealing when paired with compatible bulkhead fittings, preventing weeping and catastrophic fluid loss at critical connection points.

Mechanics, fabricators, and engine builders rely on FRAGOLA bulkhead nuts when assembling fuel delivery systems, transmission cooler circuits, and brake line assemblies on custom vehicles. This nut is compatible with standard 3/8-24 threaded bulkhead fittings and adapters, making it an essential component for anyone working on high-performance automotive projects.