The Hertel Extension Tap is a precision threading tool designed for professional machining applications. This 1/4-20 UNC tap features 2 flutes with an H3 bright/uncoated finish made from durable high speed steel. The spiral point design (also known as a plug chamfer) allows for efficient chip evacuation when creating internal threads. With a generous 6" overall length, this extension tap provides excellent reach for deep hole applications while maintaining threading accuracy. Engineered to produce a 3B class of fit, this tap delivers consistent, precise threads that meet industry standards. The extended length makes it ideal for reaching into recessed areas or through fixtures where standard taps cannot reach. Perfect for manufacturing environments, maintenance shops, and precision fabrication work where quality threading is essential. Part #G271159-1 from MSC Industrial ensures you're getting a reliable, professional-grade threading tool.