Core drill bits and dry core drill bits are indispensable tools for ceramic tilers and natural stone tilers.
Core drill bits and dry core drill bits are indispensable tools for ceramic tilers and natural stone tilers.The use of extremely hard materials such as porcelain on the one hand demands top-quality core drill bits.
Dry Core Drill Bits for Tilers and Tradespeople – Available from the Karl Dahm Online Shop
Dry core drill bits are essential tools for tilers and tradespeople when it comes to making clean and precise holes in hard materials such as porcelain stoneware, natural stone, or marble. At the Karl Dahm online shop, you'll find a wide selection of premium-quality dry core drill bits, specifically tailored to the demands of modern construction sites. With various diameters, fittings, and coatings available, we offer solutions for virtually every application. Our drill bits are designed for durability, excellent performance, and easy handling.
Versatile Use: Dry Core Drill Bits for Every Challenge
Whether you're installing sockets, routing pipes, or fixing shower screen brackets – dry core drill bits are widely used for drilling in both walls and floors. Especially when working with large-format or high-value tiles, precision is key to avoid breakage and material loss. This is where quality matters: only high-grade drill bits can deliver clean results without chipping.
Typical Use Cases:
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Bathroom and kitchen installations
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Drilling for sockets and light switches
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Mounting sanitary fittings
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Retrofitting on pre-installed tiles
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Creating cut-outs for heating or water pipes
Common Challenges on Site:
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Extremely hard materials like porcelain or granite
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No access to water on the construction site
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Dust generation and overheating
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Precise drilling without bit slippage
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Tight spaces during installation work
Karl Dahm's Solution:
Our dry core drill bits with M14 fitting are easily attached to standard angle grinders. For cordless drills, we offer compatible hex shank adapters (Item no. 12134). High-quality materials, special coatings, and integrated cooling systems ensure long tool life and excellent drilling performance. Even on difficult job sites, our tools guarantee maximum reliability.
Matrixtec Dry Core Bits: Innovation Meets Impact
The new Matrixtec series provides everything modern dry core bits should: maximum cutting performance, clean drilling results, and effective heat management. With a specialised diamond matrix and advanced coating, these bits effortlessly and cleanly drill through the hardest porcelain tiles – all without external cooling. Developed in close cooperation with experienced tilers and tested extensively on-site.
Available Diameters: Ø 6 mm to 130 mm, e.g.:
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Ø 6 mm (Item no. 50 801)
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Ø 20 mm (Item no. 50 808)
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Ø 43 mm (Item no. 50 818)
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Ø 68 mm (Item no. 50 825)
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Ø 100 mm (Item no. 50 834)
Set Options:
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Matrixtec 4-piece set: Ø 20, 38, 50, 65 mm (Item no. 50 840)
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Matrixtec 6-piece set: Ø 20, 35, 38, 43, 50, 68 mm (Item no. 50 841)
Your Benefits:
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M14 fitting for angle grinders
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Matrixtec coating for longer lifespan
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Drilling without water cooling
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Clean cuts even with large diameters
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High resistance to heat and friction
An added advantage: These drill bits produce significantly less dust than conventional tools, making them suitable for indoor use. For even greater efficiency, we recommend using them with an adjustable-speed angle grinder to optimise cutting speed for your material.
GOLD Diamond Dry Core Bits: The Classic with Paraffin Cooling
Our GOLD dry core bits are a proven solution, especially popular with tilers working with small to medium diameters. The integrated paraffin cooling reduces heat build-up and extends tool life. Perfect for those who prefer drilling without external cooling.
Available Diameters with Paraffin Core:
Recommended Sets:
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Small GOLD 3-piece set: Ø 35, 50, 68 mm (Item no. 56 203)
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Large GOLD 6-piece set: Ø 20, 35, 38, 43, 50, 68 mm (Item no. 50 234)
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GOLD bit set with hex shank: 8-piece set, Ø 5–16 mm incl. drill guide (Item no. 50 228)
Your Benefits:
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Paraffin-filled core for better cooling
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Fast, precise results without external cooling
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Safe use with cordless drills or angle grinders
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Excellent value for money
With a broad range of sets and single bits, you can equip yourself for every task. Our robust plastic storage cases keep everything organised and ready to go on-site.
Practical Accessories and Add-ons
For maximum performance, Karl Dahm offers practical accessories:
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M14 to hex adapter for all standard cordless drills (Item no. 12134)
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Adhesive cooling gel system for additional cooling (Item no. 50 368)
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Tool bag for diamond core bits (Item no. 21374)
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Drill guide for accurate hand drilling
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12V cordless angle grinder (Item no. 40 774), ideal for M5 bits like Item no. 51 418
Whether working on-site or in the workshop – our accessories ensure safe, efficient, and material-friendly results.
FAQ Dry Core Bits: The Most Important Questions and Answers for Professional Use
What is the difference between dry core bits and wet core bits?
Dry core bits are used without external water cooling and are ideal for mobile work on construction sites, especially when drilling into hard materials such as porcelain stoneware or tiles. Wet core bits are operated with continuous water cooling, which reduces heat and dust and significantly increases the lifespan of the diamond segments. They are mainly used where clean and precise drilling is required.
Dry core bits are designed to be used without water and are typically operated with an angle grinder. This makes them ideal for situations where no water connection is available. They perform very well on hard materials such as porcelain tiles, ceramics, and natural stone. Wet core bits, on the other hand, are used with a constant water supply. The water prevents overheating, reduces dust formation, and noticeably increases the durability of the diamond segments. Wet drilling is primarily used indoors, where clean and precise work is required.
In summary: dry core bits are mobile and flexible, whereas wet core bits are longer-lasting, cleaner, and more precise.
What is the optimal speed for dry core bits?
The ideal speed is around 10,000 revolutions per minute. Using light pressure and a slight circular motion prevents overheating and ensures the core bit remains sharp.
A speed of around 10,000 RPM is recommended when using dry core bits, which corresponds to the operating range of most angle grinders. However, the drilling technique is just as important as the speed. The core bit should be guided with minimal pressure to avoid damaging the diamond segments. A gentle circular motion during drilling minimizes friction and allows heat to dissipate more effectively. For longer drilling operations, brief pauses are recommended to let the bit cool down, increasing both the drilling performance and the lifespan of the tool.
Which tool connection do I need for dry core bits?
Most dry core bits have an M14 thread for angle grinders. With the right adapter, they can also be used with a drill.
Dry core bits typically come with an M14 thread, making them compatible with most angle grinders. If drilling is preferred using a standard power drill, the core bit can be converted by using a suitable adapter. There are also versions with special thread types for specific applications. It is therefore important to check the compatibility of the tool and the core bit before purchasing.
In which diameters are dry core bits available?
Dry core bits are available in diameters ranging from approximately 5 mm to 130 mm and can be purchased individually or as a set.
The available diameter range extends from very small sizes suitable for holes for screws or cables, up to larger diameters used for sockets, fittings, or pipe penetrations. Users who frequently need several different hole sizes benefit from core bit sets, which provide several commonly used diameters in one organized storage case.
Why do small dry core bits contain paraffin?
Paraffin liquefies during drilling and cools the core bit from the inside, reducing overheating and extending its lifespan.
When working with very small diameters, air circulation inside the core bit is limited, and the tool can heat up quickly. The paraffin inside the core bit melts during drilling and acts as an integrated cooling system. This keeps the temperature under control, protects the diamond grains, and allows safe drilling even in very hard and delicate materials such as porcelain stoneware or glazed surfaces.
What should I do if sparks occur while drilling?
Reduce pressure, allow the core bit to cool briefly, and continue drilling with a gentle circular motion to prevent heat buildup.
Sparks indicate overheating or excessive pressure during drilling. In such a case, the pressure should be reduced immediately and the core bit should be allowed to cool down by letting it run freely in the air for a short time. It is then advisable to continue drilling with a slight circular motion so that less friction occurs. If overheating is ignored, the diamond segment will lose sharpness more quickly and the lifespan of the core bit will be significantly shortened.
How deep can I drill with dry core bits?
Standard drilling depth is approximately 35 mm. For thicker materials, drilling from both sides or allowing cooling pauses is recommended.
Most dry core bits are designed for drilling depths of up to about 35 mm. If the material is thicker, it is effective to start drilling from the front and finish from the opposite side to avoid chipping. It can also be helpful to drill in short intervals and allow the core bit time to cool, maintaining stable performance.
What is Matrixtec in dry core bits?
Matrixtec is a high-performance coating that distributes heat evenly and reduces wear, allowing the core bit to stay sharp longer.
Matrixtec is a technology that optimizes the structure of the diamond segment, ensuring that heat generated during drilling is evenly distributed. This reduces wear and maintains the drilling performance for a longer time. The technology is particularly advantageous when working with extremely hard surfaces such as porcelain stoneware, granite, or high-density ceramic materials, making it ideal for continuous professional use.
When is it worthwhile to purchase a dry core bit set?
A set is worthwhile when different hole sizes are needed frequently. It saves time, storage space, and costs.
Users who regularly drill holes with different diameters work more efficiently with a core bit set. All required sizes are stored together and ready for immediate use, eliminating the need to search for individual bits. Additionally, sets are usually more cost-effective than purchasing each bit separately. Many sets also include adapters so that they can be used directly with different tools.
Why is purchasing from Karl Dahm worthwhile?
Karl Dahm offers durable professional-grade tools, reliable availability, and practical expertise in customer support.
Karl Dahm develops its tools in close cooperation with professionals from the construction industry. The result is durable, precise, and reliable equipment designed for demanding daily use. Fast availability, competent technical support, and the secure supply of accessories and spare parts make Karl Dahm a dependable partner for high-quality work.
Whether you're buying a single bit or a complete set – Karl Dahm is your trusted partner for long-lasting performance, expert support, and clean results on the job.
