For a project of mine, I salvaged some standoffs from the connectors of some scrapped graphics cards. However the screw that goes into them doesn't seem to be 6-32 or M3. Weirdly enough, I had some screws that were the perfect fit, but I don't have enough. It is a thread size right between 6-32 and M3. I should probably just use some standard MB standoffs, but they're already screwed in and I'm hoping to learn a thing or two.
http://www.pacificcable.com/photos/DVIFS-Diagram.gif should help . And next time use Google Images with the search string "CONNECTORNAME connector drawing" (replace CONNECTORNAME with the required name, that is DVI, D-SUB, HDMI etc), you will get your answer quicker.
4-40 jackscrews Pairs of 4-40 thumbscrews are used to fasten certain connectors to hardware ports. The screws are typically located on either side of D-subminiature connectors such as on VGA, serial, parallel, and legacy game controller ports. They are also more recently used on DVI connectors. The typical length for a 4-40 screw used in PCs is 0.18 in.