HSS-M42 (8% Cobalt) Endmills are high-performance milling cutters manufactured from premium High Speed Steel alloyed with 8% cobalt, offering exceptional hardness, superior hot hardness, and outstanding wear resistance. Designed for demanding milling applications, they provide excellent cutting performance, extended tool life, and superior dimensional accuracy even at elevated cutting temperatures. These endmills are ideal for machining stainless steel, hardened steels, alloy steels, titanium alloys, and other difficult-to-machine materials on both CNC and conventional milling machines.