Standard bits are generally suitable for normal use. If you need to drill into various different types of material, please refer to the type overview.

2. What number of revolutions is the most suitable?

You can use our diamond core bits on virtually all drill rigs available on the market. Click here for a table containing guidelines on the suitable number of revolutions. Please note that this information is only a guide. Depending on factors such as the material to be drilled into, whether the material is reinforced, whether the rig or machine has sufficient capacity or the stability of the rig or machine, you may need to adjust the number of revolutions.

3. My drill rig’s core bit has had its day. Should I buy another one?

Not necessarily: We can reface it with a new diamond core bit, providing the drill jaws are still in a good state of repair. In any event, the tube thickness will need to be sufficient. Refacing is of course far cheaper than repurchasing a new core bit.

4. My rig or machine has a different thread to the standard thread on your equipment. Will I still be able to use the core bits?

Certainly. Using a reduction coupling or adapter, all diamond core drill rigs are suitable for use with our core bits. If necessary, we can even supply you with a core bit with the correct thread.

5. The hole I need to drill is deeper than the length of the core bit. What should I do?

You have two choices here:
- You can order a longer core bit (at a limited additional cost)
- You can use an extension piece: After drilling as far as you can, remove the core and attach the extension piece between the core bit and the rig, and then carry on drilling.

6. Must I use water when drilling into concrete, granite or asphalt?

Yes. When drilling into hard materials like these, a tremendous amount of heat is released. So much heat that the drill rig’s core bits can burn out. Water-cooling is not an option, it is a necessity! You must make sure that enough water is used and that it reaches the core bits. To facilitate this, the inside of the drilling tube must be kept as clean as possible. Take extra care when drilling through multiple layers (cavity walls, floors, etc.) to ensure that no materials such as insulation blankets or floor covering get lodged in the core bit obstructing the flow of cooling water. Insufficient cooling water will lead to a broken core bit (clearly identifiable from the blue discoloration of the tube due to overheating) which will not be covered under the guarantee!

7. Something has gone wrong with the core bit causing part of it to break off. What should I do?

We will repair this for free, providing you return the part that broke off to us.

Core bit types and their main application

In most cases, you will be completely satisfied with the standard equipment supplied with our drill rigs or machines. However, if you need to drill into problematic materials or places that are difficult to reach it may be advisable to have the core bit faced with a different material for optimal performance. Please specify this with your order!

The table below should help you to make the right choice.