YG-1 F4 series vanadium alloy HSS spiral flute tap for multi-purpose. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge. Round shanks allow use with a wide variety of toolholding systems. When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. 0.6875-inches thread length. Applications: Good for steel castings and forgings/heat-treatable alloy steels, free machining stainless steel, heat and corrosion-resistant stainless steel/valve stainless steel, aluminum alloy castings. Excellent for low carbon/free machining carbon steel, medium to high carbon steel.