Spiral Point Tap: 1/4"-28 UNF, H5 / 2B-3B, 3 Flute, Plug Chamfer

These spiral-point taps have geometries and coatings optimized for tapping steel and stainless steel. Powdered Metal taps are tougher and less likely to break than cobalt and high-speed steel. They're suitable for use on highly abrasive materials such as high-silicon aluminum. Black Oxide coating improves lubricity to reduce friction, minimize heat buildup, and improve wear resistance, chip flow, and tool life. Black oxide is a good choice for general purpose use and working with soft materials, such as plastic and low-carbon steel, and should not be used with aluminum and nonferrous metals. Square shanks have a square top end to the shank, allowing them to fit hand tap wrenches or spanners. Plug taps have 3 to 5 tapered threads.