The Hertel Extension Tap is a precision threading tool engineered for creating accurate internal threads in hard-to-reach areas. This 1/4-28 UNF (Unified National Fine) tap features 4 flutes that efficiently evacuate chips while providing smooth cutting action. Crafted from high-quality high-speed steel with a bright finish, this tap delivers exceptional durability and cutting performance in demanding applications. The plug chamfer design ensures optimal thread formation, while the 6-inch overall length provides excellent reach for deep hole threading operations. With a 3B class of fit, this tap produces threads that meet industry standards for precision and compatibility. Ideal for machinists, maintenance professionals, and manufacturing operations, this H3 style tap is designed for standard hand operation, allowing for controlled threading in various industrial applications. The Hertel Extension Tap combines precision engineering with extended reach to solve challenging threading requirements.