Is there a placement chart for iPhone 5 screws

It doesn’t look like there’s an official guide on screw placement, but, if you have digital calipers, this guide disassembles the phone almost completely (Rear Case Replacement) and should list out most of the screws, their sizes, and their placements. Just follow the steps in reverse order, and be sure you match screw lengths closely (within 0.1mm or less). It’ll probably help to sort out your screws by length and size before proceeding with the guide.