The Hertel Extension Tap is a precision threading tool designed for creating #4-40 UNC threads with exceptional accuracy. Featuring 2 flutes and an H2 spiral point design, this high-speed steel tap delivers consistent performance in a variety of materials. The bright/uncoated finish provides excellent visibility during operation, while the plug chamfer ensures proper thread engagement. With a generous 4" overall length, this extension tap allows access to deeper holes and recessed areas that standard taps cannot reach. Engineered to produce 2B and 3B class of fit threads, this tap delivers the precise tolerances required for industrial and mechanical applications. The spiral point design efficiently pushes chips forward, making it ideal for through-holes. Part #G837608 from Hertel by MSC Industrial represents professional-grade quality for machinists and manufacturing professionals who demand reliable threading tools for their precision work.