I have heard some people say that one doesn't have to drill a clearance hole if the screws are partially threaded when joining two boards. The argument being that the shank just won't grip into the first board at all and there won't be a risk of bridging.

But I have noticed on my projects that the shank is often much too short to clear the first board.

So my question is, if the shank doesn't fully clear the first board, and the upper thread is still gripping into the first board, do I need a clearance hole in the first board to ensure the two boards remain tightly together?

  • Please edit your question to tell us what type of material, dimensions, and screw fasteners you are referring to. We can guess wood screws and real wood, but we ought to be sure before providing a best answer. – jdv Oct 21 '20 at 12:33
  • Also, your YouTube link isn't referenced in the text of your question. In general, it is best to make sure everything related to the question is present in the text, as ex.ernal links will be unreachable in an internet moment. Take the tour to see what I mean. – jdv Oct 21 '20 at 12:36
  • Previous related Q&A: woodworking.stackexchange.com/q/4640/5572 woodworking.stackexchange.com/q/5943/5572 woodworking.stackexchange.com/q/2708/5572 (An argument could be made that at least two of these address your question, making this one a duplicate.) – jdv Oct 21 '20 at 12:40
  • You've sort of answered your own question here, "But I have noticed on my projects that the shank is often much too short to clear the first board." If the threads can grip the board through which the screw passes, you need (or to be more accurate, should ideally use) a clearance hole. – Graphus Oct 22 '20 at 9:18

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