I believe button heads are fully domed and pan heads are more like a dome that has been flattened on the top, anyway their top edges are heavily rounded. A fillister screw is similar but with square shoulders rather than rounded and straight sides. A cap screw is like a fillister screw except that they have a smaller diameter when compared to the height of the screw head (very tall head for the diameter). There are a gazillion (rough estimate) types of screws but the bottom line for us is does it look good on the knife we are building and, if not, can I reshape it so that it does look good. The screws become part of the esthetics of the knife - use the wrong screw and the whole appearance of the knife will be, well, screwed ....
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