If you aren’t sure of the hardness of your material or what thread percentage you need to use, we recommend asking a professional. Most people do not use these types of materials for drilling for basic home improvement projects, which is why the most common thread percentage is 75%.įind the best drill bit for stainless steel in our review. Harder materials are only things like stainless steel, steel, and iron. This is because they require a tighter connection with the screw and bolt. If you are using a very hard material though, you will need to use 50%. This percentage is what can be used for most materials, especially ones that are average or soft. If you don’t know much about tapping drills, you are probably safe using 75%. However, the hardness of the material you are drilling also matters because it might affect the tap drill size. The bolt will not be able to meet the threads and they will not be able to stick together. If the hole is too large, you will also experience problems. If the hole is too small, the tapping will extend too far into the center which can make it difficult to screw the bolt into the hole later on. One of the main reasons you need to make sure you are using the right sizes and thread percentages is because you want to make sure you are having the right size hole in the base material. If you aren’t sure what drill bit size you need or the thread percentage you need to work with, you can always ask the workers at your local home supply store and see if they can offer any advice. It also gives them a longer tap tool life in most cases. Some professionals use a lower percentage thread because it allows them to tap without breaking the holes. The threaded percentage also needs to be considered because you need to know what drill bit size you need for the tapping application. Having a metric tap drill chart is important because it can help you buy the right kind of fasteners for the work you are doing. ![]() The metric drill measurements and the US drill measurements also matter because you might find a drill with both measurements, or you might find it with one or the other.
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