Spiral Flute Tap: #1-8, UNC, 4 Flute, Semi-Bottoming, 2B & 3B Class of Fit, SUPER-B Finish MPN:7350354

Spiral flute tap is renowned for its exceptional ability to handle tough materials like stainless steel or hardened tool steels at high speeds while maintaining smooth curved edges due to uniform cutting action, thereby reducing chipping and edge weakening often seen with conventional flat bottom taps. With 4 flutes & semi-bottoming design, it's ideal for producing blind holes or countersinks as well as chamfered threads on diverse substrates without sacrificing thread accuracy nor surface finish making it widely popular across automotive industry for engine block tapping.