A chipped tile or cracked piece of glass can turn a straightforward drilling job into a costly rework. The challenge is knowing what bit to use, how much pressure to apply and whether the job needs water for cooling.
The right setup gives you more control and helps protect the surface as you drill. It can also reduce heat, unnecessary bit wear and the risk of having to do the job all over again.
This guide explains which drill bits suit common speciality materials and the techniques that can help you achieve a cleaner result.
Which Drill Bit for Which Material?
Use this quick guide as a starting point, then always check the product instructions before drilling.
| Material or application | Recommended Alpha bit | Technique tip |
|---|---|---|
| Porcelain and hard tiles | Alpha Diamond Max Core Drill Hex Shank |
Use the recommended speed, avoid excessive pressure and manage heat throughout the cut. |
| Granite, marble, limestone, slate and travertine | Alpha Diamond Max Core Drill Hex Shank |
Let the diamond tip cut without applying excessive pressure. |
| Ceramic tiles and non-toughened glass | Alpha Spearpoint Drill Bit |
Use low speed, light pressure and water for cooling. |
| Dry drilling in compatible materials | Alpha Wax-Filled Diamond Core Bit |
Follow the dry drilling instructions and recommended speed on the packaging for the selected bit. |
| Larger diameter wet-cut holes | Alpha Diamond Core Bit |
These specific larger bits are not wax-filled, so water is required during drilling. Follow the instructions for the selected size. |
Drilling Porcelain, Ceramic and Stone
Hard materials such as porcelain, granite and marble can be demanding to drill. A standard drill bit may struggle to break through the surface, build up excessive heat or wear prematurely.
The Alpha Diamond Max Core Drill bits are designed for wet or dry drilling through materials including porcelain, ceramic, granite, marble, limestone, slate, terracotta, fibreglass, travertine and masonry.
They perform in heavy-duty commercial tiles and are more suited to harder materials, with the diamond segment tip helping to manage temperatures and provide a long working life.
The diamond segment tip is designed to help manage cutting temperatures. Its wide-slotted design also improves visibility while drilling and assists with plug removal.
Drilling Glass and Tile
For jobs involving materials like subway tiles, laundry tiles, bathroom wall tiles or plate glass, a controlled drilling technique is important. These brittle materials can chip or crack if too much speed or pressure is applied. Always confirm that glass is suitable for drilling before starting, as toughened glass cannot be drilled after the toughening process. Alpha Spearpoint Drill Bits are designed specifically for these materials, with the tungsten carbide tip providing controlled and precise cutting.
When wet drilling is not practical
Water helps cool and lubricate a drill bit when working with hard materials, but wet drilling is not always suitable for every job. Alpha Wax-Filled Diamond Core Bits are designed for dry drilling applications where an external water supply is not practical, with the internal wax assisting with cooling and lubrication during drilling.
A vacuum-brazed, diamond-coated tip helps manage cutting temperatures and is perfect for drilling porcelain, ceramic, granite, marble, limestone, slate, terracotta, fibreglass, travertine and masonry.
Larger wet-cut sizes are also available in the Alpha Diamond Core Bit range. Unlike the wax-filled bits, these products require water during drilling, so always check the instructions for the selected bit before use.
Heat matters, especially when using diamond tooling. Where water is recommended, keep the bit adequately cooled throughout the cut.
If wet drilling is not practical, choose a bit specifically designed for dry use. Do not use a standard wet drilling bit without water unless the product instructions confirm that it is suitable.
Do not use hammer mode when drilling porcelain, tile or glass. The impact action can damage brittle surfaces and increase the risk of chipping or cracking.
Only use hammer mode when the selected drill bit, material and product instructions specifically call for it.
Match the Bit, Technique and Speed
Speciality drilling is not just about having the right tool. It is about matching the bit, technique and speed to the material you are working with.
Alpha’s speciality drilling range gives you options for hard stone, brittle tiles, plate glass, wet drilling and selected dry drilling applications. Match the product to the job, follow the recommended technique and keep heat under control.
That preparation can help deliver cleaner results, protect expensive surfaces and get the job done right the first time.
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