I got a Corsair 5000D airflow case from a friend for free but it is missing all the four screws that hold the side panels on the back. All the screws I can find on the internet are the short version that don't have enough reach.
This screw is from my own PC case.
Edit: image with the short version that I was talking about
Correct answer. The typical coarse thread computer screw as used on full size hard drives as well as most case panels is a #6-32 screw. They should all be interchangeable.
The fine thread screws used on optical drives and so forth are metric M3x0.5.