The Hertel Thread Forming Tap is precision-engineered for creating #4-40 UNC threads with exceptional accuracy. This bottoming tap features both 2B and 3B class of fit, making it versatile for various threading applications. Crafted from high-quality high-speed steel with a bright/uncoated finish, this tap delivers reliable performance and durability in demanding environments. With a 9/16" thread length and 1-7/8" overall length, it's perfectly sized for standard threading operations. The H3 thread limit ensures consistent thread formation every time. This thread forming tap eliminates the need for chip evacuation, creating threads by displacing material rather than cutting it, resulting in stronger threads with improved fatigue resistance. Ideal for professional machinists and manufacturing applications where precision threading is essential.