I want to fasten 1/2 " – 3/4" boards onto 2x2s. I'd like to scew them from the back so that they cannot be seen. What size screw should I use?
Wood – What Size Screw Should I Use
screwswood
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Best Answer
If you go straight through the 2x2 into the thin board, you'll only have a few threads in the board and it won't be very strong. If you use a good wood glue as well, it will be much stronger.
This isn't something people pay much attention to in most cases, but a real wood screw is tapered - the shaft isn't uniform in diameter. Likewise there are tapered bits meant to drill pilot holes for wood screws. This will give you a little more strength. Tapered screws aren't hard to find, the tapered bit may be.
An alternative to consider - a pocket hole set. The Kreg brand is most popular. They sell a special drill bit, jig, and screws that work together to make a stronger joint.
https://www.kregtool.com/store/c1/joining/
I believe they had a starter kit available at the big box stores that wasn't too expensive.