Bulkhead Nut -3 2pk

The Allstar Performance Bulkhead Nut -3 2-Pack (ALL 49600) is a pair of aluminum bulkhead fitting nuts designed for -3 AN (Air National) plumbing systems. Black anodized for corrosion resistance, these nuts provide a secure, repeatable connection point in fuel systems, coolant lines, and hydraulic applications where reliability and precision fastening are non-negotiable.

AN threaded bulkhead fittings are industry standard in motorsport, aerospace, and high-performance automotive applications because they create a predictable, leak-proof seal when properly torqued. The -3 designation refers to the hose size (3/16-inch nominal), making these nuts compatible with -3 AN male fittings and bulkhead assemblies. Aluminum construction keeps weight minimal without sacrificing strength, while black anodizing protects against oxidation and extends service life in engine bays and fuel cell environments where moisture and temperature cycling are constant concerns.

These bulkhead nuts are essential for custom fuel system builds, coolant recirculation lines, and any pressurized plumbing application requiring secure, vibration-resistant fastening. Racers, hot rodders, and performance technicians rely on Allstar Performance hardware for consistency and durability across thousands of competition and street-driven vehicles. The two-pack format covers dual-line systems or provides a spare for field service and future modifications.

Allstar Performance is recognized throughout the racing community for manufacturing precision fasteners and plumbing components that meet or exceed SAE specifications. Proper installation requires using the matching -3 AN male fitting and applying manufacturer-recommended torque values to avoid over-tightening and thread damage.