Bulkhead Nut -16AN

The Bulkhead Nut -16AN from VIBRANT PERFORMANCE is an essential compression fitting component designed for high-pressure fuel, oil, and coolant line installations in custom automotive builds and engine modifications. This precision-engineered bulkhead nut serves as the primary load-bearing element in AN (Army-Navy) bulkhead fittings, allowing you to create sealed penetrations through firewalls, radiator tanks, fuel cell walls, and other bulkhead surfaces without compromising structural integrity or system pressure ratings. Whether you're fabricating a custom fuel system, retrofitting turbo cooling lines, or building a tube-frame race vehicle, a quality bulkhead nut is non-negotiable for reliable, leak-free performance.

VIBRANT PERFORMANCE's Bulkhead Nut -16AN is manufactured to strict AN specifications, featuring precise thread geometry and sealing surfaces that work in concert with the bulkhead fitting body and JIC flare adapter to create a metal-to-metal seal under extreme operating conditions. The -16 designation indicates a 16AN port size, which accommodates hoses and tubing compatible with 1-inch outer diameter lines—the standard for serious high-flow applications in supercharged, turbocharged, and LS-swapped builds. The compact 0.08 lb weight and optimized dimensions ensure easy installation in tight engine bay spaces while maintaining full structural support for bulkhead-mounted fittings under vibration, pressure cycling, and thermal cycling typical of aggressive engine calibrations and race use.

This bulkhead nut is ideal for fabricators, engine builders, and DIY enthusiasts upgrading fuel delivery, coolant circulation, and oil cooling systems on modified vehicles. It pairs seamlessly with -16AN bulkhead fittings, adapters, and hose assemblies to create durable, pressure-rated system penetrations that outperform rubber grommets and improvised seals. Proper installation requires torquing the nut to manufacturer specifications while holding the bulkhead fitting body stationary—a critical step that prevents cross-threading and ensures repeatable, leak-free performance across multiple heat cycles and system pressurizations.