External Retaining Ring: 0.821" Groove Dia, 7/8" Shaft Dia, 1060-1090 Beryllium Copper & Steel, Zinc-Plated MPN:SH-87ST ZD

Our Spiral Flute Tap is specifically designed to create uniform threads on tough alloys, hardened materials, and abrasive plastics that other taps can't handle. With a size of UNC (Unified Coarse), three flutes deliver quicker cutting speed, easy chip removal, and enhanced cooling without damaging the workpiece or tap itself. Featuring an innovative modified bottoming style to start and extend threads quickly with minimum back-outs, this tool also has 2B/3B Class of Fit (Classification for internal and external threads that provides optimal thread fit). Manufactured from high-performance Cobalt alloy that increases durability and reduces wear on the tap body. Lastly, its Ignator finish ensures superior heat resistance in demanding applications such as aircraft, automotive or energy industries where temperature can fluctuate drastically, thus ensuring that your tapping job will be completed accurately and efficiently.