3/19/2024 0 Comments Pilot hole drill bit size chart![]() Consult an engineer for questions regarding specific applications. Most newer US houses have studs made of Spruce (group 3 - 4) or Douglas fir (group 2 - 3). Wood types are grouped by the American Lumber Standard Committee and ranked depending on the hardness of the wood, the pilot hole is adjusted considerably. Once you understand these charts, you can easily read any drill bit size chart for pre-drilling on any surface. The easiest of these to address is wood type. In this blog, I have shown different charts for wood, metal & concrete pre-drill/pilot holes. Variables such as wood type, bolt length and bolt diameter all factor into ideal pilot hole sizes. Below is the quick and easy chart for most situations. hole 10mm 2.4 2.8 2.8 2.8 3.2 3.6 Pilot hole (hardwood) 1.6 1.6 1.8 2.0 2.0. Below, we have included charts displaying pilot open diameter or proper drill per dimension for most varieties of screws we bearing. For example, if you are using a 8 screw, you would want to use a drill bit that is around 4.7-5.3mm in diameter. When drilling into metal or plastic, its recommended to use a drill bit that is 10-25 larger than the screw size. Due to the bolts large diameter predrilling is needed to avoid splitting the wooden stud and/or potentially damaging the bolt (usually seen as snapping the bolt head). chart 2 3 3.5 4 5 6 Screw size Typical use Qty Head size 4.4 5.2 5.6. If the pilot hole is too small, it can cause the material to crack or break. This can also be called making a pilot hole. ![]() ![]() By using this site, you consent to the use, by us and our partners, of cookies gathered from your use of our site. Drilling a pilot hole and need to know what drill bit size to use Reference are charts for all types of self-tapping screws, including AB, B, A, and 25. Before using a lag bolt in a wood stud, the hole must be pre-drilled. This site uses cookies to enable several features including shopping carts and the collection of usage statistics.
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