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For more photo examples see Engraved Screw Heads – Gallery post on this site.
For a list of dimensions of most modern thread sizes click here;- Useful thread Data
Gun screws are one of the most common things that get lost, broken or mangled on old guns and so are often remade. On an old gun a replaced screw that hasn’t been engraved stands out a mile, yet they are one of the easiest things to engrave, as we shall see…