UNC Tap 3/8-16

The UNC Tap 3/8-16 from Allstar Performance is a right-hand thread cutting tool engineered for precision threading operations in mechanical assembly, repair, and fabrication work. This single tap is designed for machinists, automotive technicians, and fabricators who need to create or restore 3/8-inch diameter threads with a 16 threads-per-inch (TPI) pitch. Whether you're working on engine blocks, bracket installations, or custom builds, this tool delivers the accuracy required for secure fastener engagement.

The 3/8-16 tap cuts threads conforming to Unified National Coarse (UNC) specifications, a standard thread form widely used across automotive, industrial, and mechanical applications. The right-hand thread design rotates clockwise to cut threads into pre-drilled holes, making it compatible with standard tap wrench handles and drilling equipment. The compact design—measuring 7.05 inches in length with a 0.55-inch body diameter—allows for accessibility in confined spaces while maintaining structural integrity during the cutting process. The tool's modest 0.11-pound weight makes it easy to manage during extended use without introducing operator fatigue.

Professionals and hobbyists alike rely on UNC taps for creating reliable threaded holes in aluminum, cast iron, and mild steel materials commonly found in automotive restoration and custom fabrication projects. This tap is ideal for anyone drilling and threading fastener holes where 3/8-16 specifications are called for—from suspension components to transmission casings to frame modifications. Proper drill bit selection (typically a #5/16-inch diameter for 3/8-16 UNC) and appropriate cutting fluid ensure optimal tool life and thread quality. For best results, use a calibrated tap wrench and maintain consistent rotational speed to prevent breakage and achieve clean, professional threads that ensure proper fastener seating and joint integrity.