The Hertel #4-40 UNC Spiral Flute STI Tap is a precision threading tool designed for creating accurate internal threads. Featuring 2 flutes with a 52° helix angle, this high-speed steel tap delivers smooth cutting action and excellent chip evacuation. The bottoming chamfer design allows for threading closer to the bottom of blind holes, while the bright finish provides good visibility during operation. With a 2" overall length, this tap offers excellent control and accessibility in tight spaces. Manufactured by MSC Industrial under the trusted Hertel brand, this Screw Thread Insert (STI) tap (Part #007302AS) is built for durability and consistent performance across multiple threading applications. Ideal for professional machinists and fabricators who demand precision and reliability in their threading tools.