The Hertel Extension Tap is a precision threading tool engineered for professional machining applications. This 5/16-24 UNF tap features 2 flutes and an H3 spiral point design that efficiently pushes chips forward, making it ideal for through-hole operations. Crafted from high-quality high speed steel with a bright finish for optimal performance, this extension tap delivers consistent cutting results across various materials. The plug chamfer provides standard thread engagement, while the extended 6" overall length allows access to deeper holes and recessed areas that standard taps cannot reach. Manufactured to exacting 3B Class of Fit standards, this tap ensures precise thread formation necessary for critical applications. The specialized design combines reliability and performance for consistent, accurate threading results in manufacturing, maintenance, and repair operations where extended reach is required. Perfect for professional machinists working with hard-to-access threading applications.