The Hertel Extension Tap is a precision threading tool designed for professional machining applications. This 3/4-16 UNF (Unified National Fine) tap features 4 flutes with an H3 ground thread configuration for superior cutting performance. Crafted from high-quality high speed steel with a bright/uncoated finish, this standard hand tap delivers reliable performance for creating internal threads. The plug chamfer design provides optimal thread formation, while the generous 6" overall length allows for extended reach in deeper applications. Built to exacting standards with a 3B class of fit, this extension tap ensures accurate and consistent threading results. Manufactured by MSC Industrial under the trusted Hertel brand, this tap (Part #R867171) is an essential tool for machinists and manufacturing professionals working with precision components that require fine threading.