Designed for high-performance applications. Tool bits made from M-42 feature the greatest
heat resistance (red hardness) of the molybdenum-type high speed steels. Their edges will not
soften at elevated temperatures caused by high surface speeds and light feeds.
•can be heat treated to the highest hardness available in high speed steel
•can be ground nearly as easily as M-2
•best for stainless steel, super-alloys, or other heat-treated materials