The Hertel Extension Tap is a precision threading tool designed for professional machining 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 formation. The extension tap design provides extra reach for deep hole applications, with a generous 4" overall length. Built to 3B class of fit specifications, this tap delivers consistent threading results in various materials. The extension design makes it ideal for hard-to-reach areas where standard taps fall short. Perfect for maintenance professionals, machinists, and manufacturing operations requiring precise thread cutting capabilities. Part #G837601 from MSC Industrial's trusted Hertel line of threading tools.