Diameter and length of a screw, let’s learn how to properly estimate the necessary dimensions?

It is important to choose the dimensions of your screw carefully to guarantee both the safety and the durability of your construction or fixing. So let’s learn together what to remember for your next project:

Let’s start by visualizing how to measure a screw with a countersunk head versus a button head (or pan head) screw:

What length of screw to use ?

That is to say that 2/3 of the thread goes into the fixed part and 1/3 into the part to be fixed.

Which diameter should I choose for my screw ?

The larger the screw, the more resistance it offers. For fixing structural pieces, choose diameters greater than 5. And for your small carpentry work, choose diameters 3 and 4 so that the heads are as little visible as possible.

How do I choose the right pre-hole diameter ?

Thus, to make a good quality pre-hole, use a drill diameter 0.5 or 1mm smaller than that of the screw so that it does not spin in a vacuum. In our example, we use a diameter 4 drill for a 4.5 diameter screw.

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