Whether building a wardrobe, a shelf or a custom metal construction: sooner or later the question arises of how to drill metal correctly without damaging the material or creating uneven edges.
With the right tool, the correct speed and a little preparation, holes can be easily made in steel, stainless steel or aluminium – both for hobbyists and professionals alike.
In this article, you will learn which drill bits are suitable, what to look out for with different metals and how to achieve clean drill holes.
Which drill bit is suitable for metal?
Not every drill bit is suitable for metal. What's important is a metal drill bit made of HSS (High Speed Steel) or a special variant with an additional coating.
Suitable drill bit types:
- HSS drill bits – ideal for aluminium and soft steels
- HSS-Co (cobalt alloy) – suitable for stainless steel
- Step drill bits – perfect for thin sheet metal
- Hole saws – for larger hole diameters in sheet metal
Tip: Make sure the tip is sharp and has a point angle of approximately 118–135 degrees – this ensures precise results.
Step by step: Drilling metal correctly
Mark the drilling point
Mark the desired position with a pen. For harder metals, it is also recommended to use a centre punch to prevent the drill from slipping.
Secure the workpiece
Metal should always be firmly clamped or secured. This prevents injuries and inaccurate holes.
Choose the correct speed
Aluminium: higher speed
Steel: medium speed
Stainless steel: low speed, steady pressure
As a general rule: the harder the material, the lower the speed.
Use cooling
Drilling generates heat. Cutting oil or coolant extends the life of the drill bit and prevents material discolouration.
Post-processing
Sharp edges often remain after drilling. These should be smoothed with a deburring tool or sandpaper.
Common mistakes when drilling metal
- Speed too high for stainless steel
- Not securing the workpiece
- Blunt drill bit
- Too much pressure without cooling
These mistakes can lead to unclean holes or damaged material.
Comparing metal types – differences when drilling Aluminium: Soft and easy to work with. Clean results are usually straightforward. Steel: More robust than aluminium, requires slightly more pressure and an adjusted speed. Stainless steel: Very resistant. Requires sharp drill bits, low speed and consistent cooling. Custom-cut metal – less rework. Many metal profiles, sheets or tubes can be ordered already cut to size. This significantly reduces the processing effort and precise results are guaranteed from the start. At METALXACT, numerous metal products can be individually configured – including cutting and optional surface treatment. Discover our custom-made products:
Frequently Asked Questions About Aluminum Welding
Conclusion: Drilling Metal – Definitely Possible
Drilling metal is easy with the right tools and a bit of preparation. The key factors are suitable drill bits, the correct drilling speed, and sufficient cooling. This ensures precise and clean drill holes — whether for DIY projects or professional applications.
Do you have questions about your projects or custom metal solutions? We will be happy to advise you.
These articles may also interest you:
Painting Aluminum – Procedure and Important Considerations
Behavior of Aluminum, Stainless Steel, and Brass at High Temperatures
Configuring for Beginners: How to Use the METALXACT Configurator for Your Project