McMaster 2883A48 Cobalt Steel Square End Mill, 4 Flute, 9/16" Mill Diameter, 3-3/8" Overall Length

With better heat and wear resistance than high-speed steel, these cobalt steel end mills can run at higher speeds and provide better performance on hard material, such as iron, hardened steel, titanium, and tool steel. They have a square end for milling square slots, pockets, and edges.

End mills with fewer flutes provide better chip clearance for high-volume, high-speed plunge, slotting, and roughing cuts; end mills with more flutes provide a finer finish and operate with less vibration when run at high speeds.

Uncoated Cobalt Steel — Use uncoated end mills for general purpose milling and short production runs.

Center Cutting — Center-cutting end mills allow plunge cuts into a surface.