Let’s say I want to drill a number 6 size screw into a softwood.įirst, I’ll look for screw size, which is #6 in our case, then I’ll come down the chart through the same column and look for straight pilot drill size and softwood. Here’s how you can navigate through the standard wood screw chart. 3.1 Drill bit size Chart for Wood Working Once you understand these charts, you can easily read any drill bit size chart for pre-drilling on any surface. In this blog, I have shown different charts for wood, metal & concrete pre-drill/pilot holes. Multiple charts are available online, which are a bit complicated to understand. This method is very efficient when you are working daily on a project. Say I have measured two drill bits one reading is 0.114 inches & other is 0.124 inches I would pick 0.124 inches drill bit for the pre-drill. Let’s say I have measured the shank diameter of the screw to be 0.127 inches then I will measure the drill bit size by instrument I would pick the drill bit size closer to the shank diameter. The diameter of the drill bit should be a fraction less than the shank diameter of the screw. First, measure the diameter of the screw and then measure the diameter of the drill bit with the help of an instrument. This method requires a measuring instrument like a vernier caliper, screw gauge, or even scale. Make sure you compare the screw root diameter with the drill bit. Please Note that the Root diameter is always smaller or equal to the Shank diameter. In other words, the Root/Shank diameter (please see the above picture) of the screw and drill bit should be roughly the same size. In this way, the threads could catch inside the drilled hole. Hold the drill bit in front of the screw in this way, and you should be able see a good amount of threads of the screw, as shown in the picture below. This method is not an exact way to choose the right drill bit size, but it can give you a pretty good idea of which drill bit size fits your screw.įirst, take a drill bit roughly of the same size as the screw. Hit & trial method to choose the drill bit size What does the Screw size (Gauge) mean, and How do you know which Screw size (Gauge) you are using?ġ. ![]()
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