this metric screw generator will do the trick for screws between M2 and M16 with matching nuts and washers. Fastener hardware is pretty accessible, but one never knows when a 3D printed piece will ...

Thus, you don’t need to buy a separate washer to place under the screw to distribute the screw’s fastening force against the metal­–the built-in washer does that for you. A sheetmetal screw ...