Main types of end mills (classified by purpose and shape)

Eight End Mill Types and Uses

End mill types differ in tip shape, flute geometry, cutting length, edge preparation, and intended operation. Square end mills create flat-bottom slots, pockets, shoulders, and profiles. Ball nose tools produce three-dimensional contours and smooth curved surfaces. Corner-radius tools combine a flat end with stronger rounded corners, making them useful for roughing and finishing where edge durability matters.

Roughing end mills use serrated edges to break chips and reduce cutting load during heavy stock removal. Finishing tools use smooth, accurate edges for final dimensions and surface quality. Chamfer mills cut bevels, countersinks, and deburred edges. T-slot, dovetail, keyseat, and thread mills create specialized features, while engraving and tapered cutters handle fine detail, signs, molds, and relief work.

Choose among end mill types by considering material, feature shape, smallest radius, depth, spindle power, rigidity, chip evacuation, finish, and production volume. Match diameter, flute count, helix, carbide grade, coating, shank, and reach to the operation. Keep projection short, use secure toolholding, and verify runout, speed, feed, stepdown, stepover, workholding, and fixture clearance. A dependable cutting tool supplier can recommend suitable geometry. Established milling cutter practices improve accuracy, productivity, tool life, and safety.