NPT Tap 3/8-18

The NPT Tap 3/8-18 from ALLSTAR PERFORMANCE is a precision threading tool designed for fabricators, engine builders, and automotive mechanics who work with hydraulic lines, fuel systems, and custom fluid transfer applications. This 3/8-inch National Pipe Thread (NPT) tap cuts internal threads at the industry-standard 18 threads-per-inch pitch, making it essential for creating threaded ports in manifolds, adapters, and custom-drilled engine blocks.

NPT threads are tapered, meaning the thread angle changes slightly along the length to create a self-sealing conical fit—critical for leak-free connections in high-pressure systems. The 3/8-18 NPT Tap cuts this precise taper profile into aluminum, iron, or steel materials, allowing you to create NPT ports that may require sealant tape depending on the application.

Professional engine builders and custom fabricators rely on this NPT Tap when installing braided stainless steel lines or modifying fuel systems. The compact 7.05-inch length and lightweight 0.25-pound design make it easy to handle in engine bays or confined fabrication spaces, while the 0.85-inch diameter flutes provide optimal chip evacuation during the cutting process.