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Ratgeber: Loch in Granitspühle und Spülbecken Bohren Bannerbild

Drill hole in granite sink and kitchen sink

Drilling a hole in a granite sink (sink) is not particularly difficult.

Difficulty: Easy-Medium | Costs: approx. 35 euros | Workload: approx. 20 minutes

In this article, we will show you comprehensive step-by-step instructions on how to drill holes in a granite sink professionally, quickly, easily, safely and precisely.

We also give you valuable tips for choosing the right tools and machines that are required for this task.

With this you will be able to install your fixture, faucet and everything else.

Drilling a Granite Sink - A handyman installing the granite countertop and preparing to drill the granite sink

1. Introduction to Drilling Holes in Granite Sinks

Built-in granite sink in kitchen

Granite sinks are known for their durability and exceptionally beautiful aesthetics, but drilling this high quality and expensive material can be a challenge without the right tools and expertise.

As a rule, the required drill holes are already present in granite sinks, which can be identified by markings or bulges on the back.

I recommend that you use the target drill holes that have already been marked and only drill elsewhere in extreme emergencies.

2. Choosing the right drill bit for granite sinks

Image of a granite drill bit on a cordless screwdriver

Since granite is a very hard material, you need a tile drill bit with the right diameter for your application.

Our experience shows that a borehole for a faucet and fittings usually has to be drilled with a 35 mm diameter.

The diameter should correspond to the item to be installed that you want to attach later. 20 mm and 35 mm diamond drill bits or tile drill bits are often used for this work.

Good to know: You can usually find the information you need about the required diameter on the respective packaging. At least on ours.

2.1 What types of drill bits and drill bits are suitable for granite drilling?

Diamond drill bits for hard rock and hard tiles are available in different versions and can be used with both a cordless screwdriver and an angle grinder.

We recommend using an angle grinder as it is better at handling delicate surfaces and consistently produces cleaner holes.

As an inexperienced user, you can use a drilling aid to help you hold the tile drill bit in the guide.

2.2 What are the advantages and disadvantages of drilling granite with a tile drill bit?

Advantages Disadvantages
angle grinder Better handling on sensitive surfaces Higher volume and possibly more dust
Clean boreholes Requires more skill to operate
Faster drilling possible
Ideal for larger boreholes such as fittings
Drill (cordless screwdriver) Easier handling for beginners Possibly slower drilling progress
Less noise and dust No possibility for drill holes larger than 14 mm
Easier positioning of the drill

3. Instructions: Drill a hole for a tap or in a granite sink step by step

A craftsman installing the kitchen and a granite sink

  1. Place the drilling aid at the desired location, if necessary and available.

  2. Mount the diamond drills with M14 on the angle grinder or the drill.

  3. Guide the drill to the desired drill hole position and orientate yourself to the usually available intended location.

  4. Caution: Diamond drill bits must be set at an angle of approx. 45 degrees or slightly at an angle when drilling. Set the drill bit at a slight angle and slowly increase the speed.

    As soon as the diamond drill bit has found a footing, set it up and continue drilling. A slight pendulum movement makes drilling your granite sink much easier. The pendulum movement ensures improved removal of the material.

Personal experience: Drilling a hole in a granite sink can take up to 60 seconds. To protect the tile drill bit, you can moisten it from time to time or immerse it in cold water.

3.1 Our tip for clean drill holes in sensitive granite

You can cover the drilling site with masking tape to get a better hold. In addition, the masking tape protects you from possible damage if the tile drill slips.

4. Checking the drilled hole and post-processing

As a rule, diamond drills do not cause any damage to your granite sink. Nevertheless, with a high-quality material such as granite, it can make sense to regrind the drilled area with a diamond grinding pad .

Diamond abrasive when grinding a granite sink with the angle grinder

Alternatively, you can use a diamond cutter for the angle grinder to grind the inside edges of the granite. This removes the material in a fine layer.

Produktbild Diamond milling cutter for grinding edges after drilling granite sinks

Conclusion Drill granite sinks

With the right preparation, the right tools and our step-by-step instructions, drilling a hole in a granite sink is not rocket science.

Be sure to choose the right drill bit, maintain the drill angle, and make an oscillating motion while drilling.

Finally, you should check the required drill hole for possible damage and rework it if necessary. With a little practice and patience, drilling in granite becomes a success.

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  • Bild von Jürgen Kleis Werkzeuge Experte - Tipps und Tricks rund um das Thema Handwerken und Heimwerken

    Jürgen Kleis

    "With my many years of experience in the tool industry, I can give you helpful tips and tricks for DIY and handicrafts".

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    I try to give the community at all available levels tips for building a house, renovating or gardening.