What screws for plastic box? | DIY Home Improvement Forum
Mar 21, 2010· Joined Sep 10, 2008. ·. 3,368 Posts. #4 · Mar 20, 2010. If the box is a round type, as commonly used for ceiling lights, then an 8-32 screw would be appropriate. If the box is rectangular, as used for wiring devices (switch, outlet, etc) then a 6-32 screw is what you will need. I have successfully used coarse thread #6 drywall type screws in ...