The Hertel Extension Tap is a precision threading tool designed for creating accurate 1/4-28 UNF threads. Featuring 2 flutes and a spiral point design, this high-quality tap efficiently channels chips forward, making it ideal for through-hole applications. Crafted from durable high speed steel with a bright/uncoated finish, it offers excellent cutting performance and longevity. The H3 designation indicates its suitability for general-purpose threading applications across various materials. With a generous 6" overall length, this extension tap provides excellent reach for deep holes and recessed areas. The plug chamfer design facilitates easier starting and produces full threads, while the 3B class of fit ensures standard thread tolerances for reliable assembly. This Hertel tap (Part #G837586) is manufactured by MSC Industrial to meet precise machining requirements in industrial applications.