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Keeping this in consideration, what size are hinge screws?
Unless otherwise specified all products prepared for butt hinges will have mounting holes drilled and tapped for 12-24 screws. The most common hinge used is a full mortise butt hinge, typically 4 1/2" or 5" high offered in standard and heavy weight, they are all supplied with a 12-24 screw.
Moreover, what screws to use for door hinges?
Screw the hinge back in with yellow dichromate (zinc-plated) screws—the color and head size of these rust-resistant drywall screws are a good match for standard brass hinge screws.
Check that the door jamb on the hinge side is plumb and shim as necessary. Temporarily screw the hinge jamb in place by driving two #8 3-inch drywall screws through it: One about 2 inches above the top hinge and the other about 2 inches from the center hinge.