How Do You Use a Countersink Bit?

Written by c.l. rease
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How Do You Use a Countersink Bit?
Drilling a countersink allows the head of a countersunk screw to rest below a material's surface. (screw image by Bube from

Screw heads resting above a wood surface leave an unprofessional look to a finished woodworking project. A countersink bit creates a recess on the surface of the material to add a finished look to your woodworking project. To create a proper countersink, the diameter on the countersink bit must match the size of the screw head, and the taper of the countersink must match the degree of the taper on the bottom side of the conical head screw.

Skill level:

Things you need

  • Tape measure
  • Carpenter's pencil
  • Countersink bit
  • Countersunk screw
  • 3/8-inch drill motor
  • Safety glasses

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  1. 1

    Mark the location of the countersunk hole on the surface of the wood with the tape measure and the carpenter's pencil.

  2. 2

    Measure the diameter of the countersunk screw head with the tape measure. This measurement will determine the size of the countersink bit required to recess the screw below the surface of the wood.

  3. 3

    Hold the countersink bit in front of the countersunk screw head. Align one angled side of the countersunk screw head with one side of the countersink drill bit. The angles need to align perfectly for the countersunk screw to seat properly. If the angles do not match, replace the countersink bit for a bit with the proper drilling angle.

  4. 4

    Secure the countersink drill bit into the chuck of the 3/8-inch drill motor. Put on your safety glasses.

  5. 5

    Align the tip of the drill bit with the location you marked on the surface of the wood.

  6. 6

    Drill into the wood. Stop drilling when the top of the drill bit's taper is even with the surface of the wood.

  7. 7

    Pull the countersink drill bit from the wood to complete the countersunk hole.

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