A clearance hole is also a necessity when bolting wood together. If the threads are at the top part, you will need it.
Partially threaded screws sometimes need a clearance hole. You want to avoid jacking as it could lead to issues in the long run.
What is the purpose? It prevents the bottom material from getting jacked by the top one. When should you have a clearance hole? If you have a fully threaded screw, then you need it. If you accidentally drill on both wood pieces, your screw will fall off. The next question you might be asking yourself is, how deep does one need to drill it? Do you do it halfway, a quarter, or all the way? In most cases, it should be until the top material only. It would result in a few problems, such as a weak bond between pieces of wood. When this happens, the screw will tighten itself on the wood’s top portion but not pull the two pieces together. What happens if you do not have a clearance hole? The screw threads will bind against the grain of the top wood piece, causing it to separate. This hole would prevent the screw from attaching to the top piece of wood as you screw them together. It should be larger than the screw thread’s diameter. When screwing or joining wood together, the first step is to make a hole on the top piece of wood. The next question is, how does it work? People won’t go the extra mile of drilling a larger hole for nothing. It does not look aesthetic and may weaken the hold. Other materials aside from wood also require a clearance hole to prevent any materials from splitting or cracking.
It also drastically reduces the risk of jacking, which is typically common in woodworking. It results in a tighter joint between these pieces of wood. So, why do you need a clearance hole?Ī clearance hole is smaller than the screw’s head but is a tad larger than the thread’s outside diameter. It is necessary for all woodworking projects. If you have ever wondered, we call this the clearance hole. When woodworkers are drilling a hole in a wood piece, the first hole they will drill is likely bigger than the screw size.
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