Spiral Flute Tap: 1/2-20, UNF, 4 Flute, Semi-Bottoming, 2B & 3B Class of Fit, High Speed Steel, Oxide Finish MPN:7557100

The spiral flute tap is a thread-forming tap used to cut internal threads in various materials such as metals, plastics, and composites. This specific model has a nominal diameter of 1/2 and threads per inch (TPI) of 20, making it suitable for creating UNF (Unified National Fine) threading standards. It features four flutes for efficient chip evacuation and a semi-bottoming design that provides excellent threading quality without reaching the bottom of the hole. The tap's class of fit is a combination of 2B (secondary) and 3B (intermediate), offering a strong, wear-resistant cutting edge that can withstand high torque and heat during the threading process. It is made from high speed steel (HSS) for durability and an oxide finish for improved surface finishes. Spiral flute taps are commonly used in industries such as automotive, aerospace, medical, and manufacturing where high-quality threaded components are required.