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Unlock the Mystery of Power Drilling: Learn How to Drill Tempered Glass Like a Pro!

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Written By John Gibbs




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If you need to drill tempered glass, you have come to the right place. This article will provide you a step-by-step guide on how to drill tempered glass for a perfect job. You will get to know the materials and tools needed, the safety precautions to be taken and the steps to follow while drilling tempered glass. So let’s get started and learn how to drill tempered glass!

What is Tempered Glass

What Is Tempered Glass
Tempered glass, also known as toughened glass, is a type of safety glass that is treated with a thermal or chemical process to increase its strength. It is up to five times stronger than regular glass, making it an ideal choice for many home and commercial applications, such as windows, doors, and shower enclosures.

Glass Tempering Process

Tempered glass is made by heating the glass to a temperature of 650°C and then cooling it quickly with air. This process creates a surface tension that gives the glass its strength. It also makes it more resistant to thermal shock and impact, as well as making it difficult to drill a hole in tempered glass. However, with the right tools and technique, it is possible to drill a hole in tempered glass for a variety of applications.

Understanding the Risks

Understanding The Risks

Drilling into tempered glass carries a higher risk of breakage than drilling into ordinary glass. The tempering process makes the glass more brittle and prone to cracking. To reduce the risk of breakage, it is important to:

  • Ensure that the drill bit is the correct size for the hole being drilled.
  • Use a low speed setting on the drill.
  • Drill at a shallow angle, preferably no more than 15 degrees.
  • Keep the drill bit well-lubricated.
  • Be prepared to stop drilling and remove the bit immediately if any cracking occurs.

As tempered glass is thicker than ordinary glass, it may take longer to drill and some additional pressure may be needed to penetrate it. When the drill bit is near the end of the hole, the pressure should be decreased to reduce the risk of breakage.

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Safety Precautions

Safety Precautions

  • Put on safety glasses to protect your eyes from dust, flying particles and glass shards.
  • Wear gloves to protect your hands from any cuts and abrasions.
  • Secure the glass to a stable surface before drilling. Clamp a piece of wood to the glass to ensure it does not move, or secure it with double-sided tape.
  • Ensure proper ventilation in the area. The drilling process produces dust and other particles, so open a window or use a fan to keep the air circulating.
  • Work slowly and carefully when drilling the glass. Keep a steady and even pressure on the drill bit. If the drill bit starts to wander, stop and reposition the glass.
  • Keep the drill bit lubricated with water. This will help cool the bit and reduce the chance of overheating.
  • Wear a respirator to protect your lungs from dust and particles. Change the respirator filter regularly.
  • Clean up any glass shards immediately. Wear gloves when cleaning up and dispose of the glass safely.

What You Need

What You Need

Drill Bits

Diamond drill bits are essential for drilling through tempered glass. Drill bits made from other materials, such as carbide, cobalt, or steel, will not be able to penetrate the surface of the glass. Diamond drill bits are available at many hardware stores and online retailers.

Other Equipment

In addition to the diamond drill bit, you will need a water-cooled drill and some protective eyewear. The water-cooled drill will help keep the temperature of the drill bit stable while drilling. Protective eyewear should be worn to protect your eyes from flying glass fragments.

Step-by-Step Guide

Step-By-Step Guide

Mark the Area

Mark the area you want to drill with a marker or an adhesive tape.

Secure the Glass

Secure the glass on a flat and steady surface, like a table or a workbench.

Prepare the Drill Bit

Choose a carbide-tipped drill bit specifically meant for drilling through glass.

Begin Drilling

Start drilling the glass at a slow speed.

Keep Drilling

Keep the drill bit pressed firmly against the glass while drilling and apply a moderate pressure.

Drill the Second Hole

If you need to drill a second hole, repeat the steps above.

Remove the Glass

Carefully remove the glass from the surface and dry off any excess glass particles.

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Tips for a Perfect Job

  • Choose the Right Drill Bit: Make sure you use a drill bit suited for glass. These are usually diamond-tipped.
  • Set the Speed: Set the drill speed to low to prevent the bit from overheating.
  • Secure the Glass: Secure the glass with a clamp or a vise to prevent it from slipping.
  • Create Pilot Hole: Use a small drill bit to create a pilot hole to ensure accuracy.
  • Drill Slowly: Drill slowly and steadily to prevent chipping and cracking.
  • Set the Pressure: Apply light pressure to the drill bit while drilling to ensure a clean hole.
  • Cool the Drill Bit: Regularly cool the drill bit with water to prevent overheating.
  • Remove Glass Shards: Use a vacuum to remove any glass shards from the hole.

Frequently Asked Questions

Is it Possible to Drill Tempered Glass Without Damaging it?

Drilling tempered glass is possible, but it requires special techniques and tools. A diamond drill bit must be used along with lubrication and controlled speed. To reduce the risk of shattering, the glass should be clamped firmly in place, and the drill bit should be replaced regularly. With the right approach and technique, it is possible to drill tempered glass without damaging it.

What type of Drill Bit Should I Use for Drilling Tempered Glass?

The best drill bit for drilling tempered glass is a diamond-tipped drill bit. Diamond-tipped drill bits are equipped with tiny industrial-grade diamonds that are capable of cutting through the hard surface of tempered glass. To ensure a successful result, use a drill bit with a tip that is only slightly larger than the hole you are drilling.

Are there any safety precautions I should take when drilling tempered glass?

Wear safety goggles or a face shield to protect your eyes from glass splinters. Wear a dust mask to prevent breathing in glass dust particles. Use a piece of scrap wood or plywood underneath the glass to prevent it from breaking. Never use a drill bit made of steel on tempered glass; use only a diamond drill bit. Keep the drill bit cool by spraying it with water or coolant while drilling.

What type of drill speed should I use when drilling tempered glass?

Start Slow: When drilling tempered glass, it’s best to start at a low speed and gradually increase to the desired speed. A low speed will reduce friction and heat, helping to avoid breakage.

Keep it Steady: Once you reach the desired speed, maintain a consistent speed throughout the drilling process. This will help to ensure a clean and accurate hole.

Use an Appropriate Speed: The appropriate speed will vary depending on the type of drill bit being used. For glass and tile, it’s best to use a speed between 500-1,000 RPM.

Decrease Speed When Finishing: As you near the end of the drilling process, it’s important to decrease the speed. This will help to ensure that the edges of the hole are smooth and even.

Use the Right Accessories: It’s important to use the right accessories when drilling tempered glass. Use a water-cooled drill bit, a vacuum base, and a lubricant to help reduce heat and friction.

Are There Any Special Techniques I Should Use When Drilling Tempered Glass?

When drilling tempered glass, be sure to use a diamond-tipped drill bit that is specifically designed for glass. Use a drill bit that is slightly smaller than the finished size of the hole you are drilling. To prevent the glass from cracking, use a low speed when drilling and apply a steady pressure. Additionally, apply water to the bit and the glass to cool the bit and keep the glass from cracking or shattering. After drilling, clean off any remaining glass shards and smooth the edges of the hole with a file or sandpaper.


Drilling tempered glass can be a tricky task. However, with the right tools, patience, and following the steps provided in this guide, you can do it without any problem. Remember to wear safety gear, use lubricating oil, and keep the drill bit cool to avoid damaging the glass. With the right technique, you can create a perfect hole in the tempered glass.



About John Gibbs

Hello everyone! My name is John Gibbs. I am 60 years old and have been in the family construction business all my adult life. Construction is not only my profession but also my passion. I know everything about building and repair materials, tools, advanced methods, techniques, and approaches. I will share the same knowledge with you in my articles.

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