Twist Drill Parts and Functions

Twist Drill Parts and Their Functions

Twist Drill Parts work together to cut, guide, clear chips, and transmit torque during hole making. Learn the three main sections, their functions, selection factors, inspection points, and maintenance needs.

The point contains the cutting lips and chisel edge that start and form the hole. The body includes flutes, lands, margins, and the web; these features guide the drill, carry chips away, and deliver coolant. The shank connects the tool to the chuck or spindle and transmits torque. Geometry, diameter, material, coating, and length should match the workpiece and machine.

Inspect point symmetry, cutting-edge wear, flute damage, buildup, runout, and shank condition before use. Correct speed, feed, coolant, alignment, and rigid workholding reduce chatter, heat, and premature failure. A qualified cutting tool manufacturer can recommend suitable geometry. General drill bit information also explains tool construction and applications.