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Home | Newsroom | Blog | Holes and Notches in Tempered Glass
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Holes and notches in tempered glass, should be located within specified areas per this image. Refer to the table for noted dimensions.
Glass Edge to Hole Rim: The minimum distance from the rim of a hole to the nearest edge of the glass must be ¼” or 2 x glass thickness, whichever is greater. Tolerance for location of hole from specified edge is ±1/16”.
Minimum Distance Between Holes: The minimum distance between the rims of adjacent holes must be 3/8” or 2 x glass thickness, whichever is greater. Tolerance for dimension between hole centers is ± 1/16”.
Glass Corners to Nearest Rim of Hole : Holes in the vicinity of a corner must be positioned so that the nearest edge of the hole is a minimum distance from the corner of 6.5 x the glass thickness.
The minimum dimension of a hole should be at least 1/16″ larger than the thickness of the glass. The maximum dimension of the hole should not be more than 1/3 the narrowest dimension of the piece.
All must have a fillet with radius equal to, or greater than the thickness of the glass.
Use this table for reference with the image above.
All fabrication that penetrates the glass surface (i.e., holes, notches, cutting) must take place prior to tempering or heat strengthening. Attempting fabrication on tempered glass WILL cause it to shatter.
Glass fabrication must be done before the glass is tempered.
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©2020 The Wagner Companies, R&B Wagner, Inc. All Rights Reserved
(B) Distance from edge of the hole to the edge of the glass
(C) The distance between rims of holes
(E) Distance from corner to the rim of holes

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You may need to occasionally drill into glass for a craft project or a repair around the home. Fortunately, this is a simple, quick project that most crafters and homeowners can do with just a drill, a special type of drill bit, and plenty of water.

Crafts such as hanging wind chimes , projects with wine bottles or Mason jars , or making glass jewelry are common tasks where you may need to drill into glass.

Drilling into wood or plastic is a familiar project for many people. Other than adjusting for the hardness of the material, this is a straightforward task. Drilling into glass is different because the speed of the drill must be kept slow to control the temperature. If the glass gets too hot, it may break. In addition, starting the hole can be tricky since the drill bit has a tendency to skitter across the surface.

A continuous stream of water on the surface helps lower the temperature of the drill bit and the glass. An assistant can carefully pour a thin stream of water over the surface as you drill. Or you can use a plastic jug that leaks a steady stream of water, as described in this project.

Purchase a carbide-tipped drill bit for the best results.

Drilling into glass is hazardous. Be sure to wear safety glasses, gloves, and a dust mask at all times. Glass dust is very harmful, so never breathe it in, and keep it off of your skin. The constant flow of water will help hold down the glass dust and wash it away.

Only use a cordless drill . Do not use a corded drill as this presents a shock hazard when used in conjunction with the water. 1

Depending on your type of clamp , you may need additional padding between the clamp and the glass. If you are drilling flat glass, it must be supported from below.

When clamping the glass, do so very gently.

Scoop out a ball of plumber's putty about 1-inch in diameter. By hand, roll it out so that it is about 1/4-inch wide and 3 inches long. Form a circle. Stick this circle on the glass.

Fill an empty, clean plastic milk jug with cool water. Cap the jug. Use a push pin to pierce the side of the jug, near the bottom. Keep the pushpin in the jug, for now, to prevent the water from flowing out.

Move the glass material into position. Remove the pushpin. A thin stream of water should flow. Aim the water so that it hits the center of the plumber's putty dam.

While the dam will fill up and flow over the sides, it is helpful to lightly press your finger into one side of the dam to create a flow in one direction.

Chuck the carbide drill bit into the cordless drill . Place the end of the bit on the drilling spot. Gently press the drill trigger so that the bit slowly rotates. Drilling at high speed will cause the bit to move away from the drill spot.

If it is difficult to get the hole started, remove the plumber's putty dam and tape a small square of cardboard on the glass. Drill through the cardboard; this helps to steady the drill bit. Then, put the dam back on and resume drilling.

Frequently dump out the water and check the progress of the drilling. Be patient. Drilling a 1/4-inch hole into thick glass such as a wine bottle can take about 10 minutes. Toward the end, decrease the forward pressure on the drill to avoid chipping the inside edge of the hole.

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