YG-1 SI series vanadium alloy HSS 40 degree helix spiral flute tap. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Hardslick coated. 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. 0.354-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, nodular cast iron/chilled cast iron/meehanite iron/ductile iron. Excellent for low carbon/free machining carbon steel, medium to high carbon steel.