The Hertel Extension Tap is a precision threading tool designed for professional machinists and industrial applications. This 3/8-16 UNC tap features 4 flutes with an H3 ground thread form and bright uncoated finish for optimal performance. Crafted from high-quality high speed steel, this standard hand tap with plug chamfer ensures accurate and clean thread cutting. The 6" overall length provides extended reach for deeper holes and difficult-to-access areas. With a 3B class of fit, this tap delivers consistent threading results for mechanical fastening applications. The extension design makes it ideal for reaching into recessed areas where standard taps cannot access. This Hertel tap (Part #R867152) is manufactured by MSC Industrial to meet rigorous industrial standards, making it a reliable choice for threading operations in manufacturing, maintenance, and repair environments.