The Hertel Hand STI Tap features a 5/16-18 UNC thread size with an H3 tolerance and 4 flutes for efficient threading. This bottoming chamfer tap is designed for creating threads that extend nearly to the bottom of blind holes. With a generous 1-1/4" thread length and 2-15/16" overall length, this tap provides excellent reach for various applications. Crafted from high-speed steel with a bright finish, it offers durability and visibility during use. The 4-flute design helps with chip evacuation while maintaining thread quality. This precision threading tool is ideal for maintenance professionals, machinists, and manufacturing applications where accurate thread creation is essential. The bottoming design ensures maximum thread engagement in blind hole applications.