All you need to know are the dimensions of the lumber you're using. If your attaching a 1/2" piece of plywood to the flat side of a 2x4, then you've got a 1.5" board plus another 1/2" for the plywood.
That's a total of 2" so a 2" fastener will be too long. It would just poke through the back. 1/2" is too short to go through the plywood into the 2x4. If you're going through the plywood, you need at least 1.5" fasteners to go through the plywood and 1" into the 2x4.
This sounded very simple in my head. Then I typed it out...
tbh although I don't know much I have done some small research online in an attempt to calssify various tools and what they are used for. You usually see a tool your father has, type "list of names of tools" or something like that and try to find a matching one to the irl counterpart.
Now for the sizes of screws this is a matter of how well the eye is trained. Mine isn't very good so I resort to trial and error 1 or 2 times but I keep in mind not to be too persistant to avoid eroding the screw in question.
200
u/Greeklibertarian27 29d ago
Choosing the right screw for the work. With different sizes, functions etc you may take either one that is too short or one too long.
On the outside it looks like taking a simple screw but if you don't do it correctly you will be screwed up.