#4x 1/8 MPT Str Adapter Fitting Steel

The #4x 1/8 MPT Str Adapter Fitting Steel by FRAGOLA is a precision straight adapter designed to bridge AN (Army-Navy) and NPT (National Pipe Thread) port sizes in hydraulic, pneumatic, and fuel system applications. This fitting connects a 4 AN male port to a 1/8 inch NPT male inlet, making it essential for custom fuel system builds, engine swap installations, and aftermarket hydraulic integration where mismatched port threads must be resolved. Whether you're building a high-performance vehicle or repairing industrial equipment, this adapter eliminates costly incompatibilities and reduces assembly complexity.

Constructed from steel with a zinc oxide finish, this straight adapter provides superior corrosion resistance and durability in demanding environments. The zinc oxide coating protects against rust and oxidation, extending service life in both wet and dry conditions. The straight configuration (no bends or offsets) enables compact installation in tight engine bays or equipment frames, while the male-to-male threading pattern ensures secure, leak-free connections when paired with compatible female ports or threaded receptacles. FRAGOLA's engineering ensures thread compatibility and pressure rating suitable for fuel delivery, coolant circulation, and low-pressure hydraulic applications.

This adapter is ideal for automotive enthusiasts, fabricators, and technicians performing engine conversions, fuel system modifications, or equipment maintenance. It is commonly used in LS engine swaps, carburetor to fuel-injection retrofits, and custom cooling system layouts where OEM hose barbs or fittings don't match the target manifold ports. Verify your exact port sizes before purchase; AN sizes differ from metric, and NPT threads require proper sealant (PTFE tape or thread compound) for a reliable seal. With compact dimensions and minimal weight, installation is straightforward and compatible with standard wrench sizes.