1/8 Fnpt to 16mm x 1.5mm Male Adapter Fitting

The 1/8 FNPT to 16mm x 1.5mm male adapter fitting from EARLS is a precision engineered component designed for custom cooling system, fuel system, and engine monitoring installations on high-performance vehicles. This straight adapter bridges the gap between legacy NPT threaded ports and modern metric hydraulic or pneumatic connections, making it essential for engine builders, performance shops, and DIY enthusiasts retrofitting gauges, coolers, or auxiliary systems into vehicles with mixed thread standards. The compact design fits tight engine bay spaces without requiring bulky converters or manifold blocks.

Constructed from aluminum and finished in blue anodized coating, this adapter resists corrosion and oxidation while remaining lightweight—critical for weight-conscious builds. The blue anodize serves both functional and aesthetic purposes: it protects against moisture and salt intrusion that can cause thread seizing in engine compartments, and it identifies the fitting visually within complex plumbing networks. The 1/8 inch NPT female port accepts standard SAE straight-threaded fittings, while the 16mm x 1.5mm male end interfaces with metric ISO threads common in European and Japanese performance systems, delivering a leak-free seal without compromise.

Mechanics and fabricators regularly specify this adapter when installing oil pressure gauges, transmission coolers, or turbo feed lines on modified engines where original port sizes don't match aftermarket components. Whether you're upgrading a naturally aspirated engine to forced induction or integrating a complete custom cooling circuit, this straight adapter eliminates the need for expensive custom manifolds or bulky angled connectors. Its diminutive weight of 0.03 lbs ensures negligible impact on overall system mass, while the robust aluminum construction withstands operating pressures found in high-boost applications and extended track sessions.