A slot drill is a type of end mill that is designed to cut slots in metal and other hard materials, such as wood, plastic, and composites. The slot drill has two flutes and a cylindrical shank, which fits into a drill chuck or a milling machine spindle. The cutting end of the slot drill features a drill bit at the centre, surrounded by a circumference that is sharpened to produce cutting edges. The drill bit in the centre helps to start the hole while the sharp circumference edges cut down along the sides of the hole, forming a slot.
Slot drills are used for a wide range of applications, including milling, drilling, and routing. They are particularly well-suited for creating narrow slots or channels, such as those found in keyways, grooves, and channels. Slot drills are commonly used in manufacturing industries such as aerospace, automotive, and industrial parts production. They can be used on a variety of materials, including stainless steel, aluminium, brass, and other metals, as well as harder materials, such as ceramics and reinforced plastics.