OSG Threading Tap NPT A-Spiral Flute - Powder Metal Right Hand -TiCN Coated - Blind Holes DIN5156 - 3/8 x 18Engineered for precision pipe threading in blind hole applications, the OSG Threading Tap NPT A Spiral Flute delivers dependable, high quality NPT threads with every cut. This right hand tap is built for machinists and shops that demand durability, consistent performance, and efficient chip evacuation in tight spaces. Thread Type: NPT (National Pipe Taper) threads designed for blind hole applications Flute Design: A Spiral flute for effective chip