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Countersink Drill Bits – Get the Lowdown

Let’s start with the basics. Essentially, these attachments are cutting tools responsible for creating cylindrical holes within various materials.

It is most common to create holes in wood. Still, professional builders or contractors, carpenters, or DIY home improvers will know that one can also work these into various other materials, such as metal, plastic, concrete, tile and more. Whilst most bits aim to create cylindrical holes, some options are specifically designed to make other types of holes as well.

What are Countersink Drill Bits

These products produce a cylindrical hole cut but can also be used to remove the burr left from a drilling or tapping operation, which drastically enhances the finished product by smoothing away any rough or splintered edging. There are different aspects to the characteristics and parts of a countersinking design.

The Anatomy

  • The Spiral – This is the rate of twist in the attachment bit that controls how fast the bit chips into the material.
  • The Mechanic – This is also known as the jobber and describes the length. This impacts the depth of the hole.
  • The Lip Angle – This determines how much support is provided to the cutting edge of drill bits.
  • The Point Angle – This is the angle formed at the cutting tip of the bit. Different point angles for different types of material are required, which is why it is essential to use a range of these in conjunction with your hole saw.

They’re More Effective Than You Think

Not only does this accessory cut out the opening for the screw head, but it also offers fantastic counterbore functions as well.

Although these terms are occasionally used interchangeably, the critical variance lies in the shape of the bottom of the hole. Countersinking creates a conical hole matching the angled profile on the underside of a flat-head screw. Counterboring creates a flat-bottom hole enabling the head of a screw with a flat bottom to rest solidly in the counterbore. Usually made of high-carbon steel for precision and durability, some may come with carbide tips or high-speed steel for added accuracy.

High-speed steel and carbide countersinks hold longer than high carbon and are often earmarked for heavy production work.  Once complete, sanding complements your tool kit in ensuring a smooth finish. View our range of sanding pads and diamond blade accessories here.

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