As noted, what type of head?
I have several types in 6-32 x1/2", can stick them in the lathe and face off that extra 1/16th inch.
But I'm in Pahrump.
Or, you can pick up the type you need in 1/2" length and get a hardened steel screw checker plate ($20, Amazon) put the screw through it, grind or fill off the last 1/16" down to the hardened plate.
You might also try a pair of Electrician's wire strippers, most have threaded holes in them for 6-32, 8-32 and 10-32 screws, you screw the screw into the threaded size, then close the handles and it trims the screw to the length you want.
If you have a 6-32 tap, you can drill a 7/64" Ø hole in a piece of steel flat stock, tap it (you can get the tap and 7/64" drill bit and a piece of mild steel flatstock all at Home Depot for under $20) then screw a 1/2" 6-32 nut onto the screw, then the screw into the hole you just tapped, run the screw through until 1/16th inch sticks out, then tighten the nut against the flat stock to jam the screw in place so it won't rotate while you file or grind it down to the 7/16" length you need.
Gunsmiths call that flatstock screw holder a "Screw Gizzy", we usually make them in 3-56, 4-40, 6-48 and 8-40 for the common screw sizes on
guns, and then harden them so that a file won't cut them so we can easily file a screw to fit for length.
You do that on custom
guns or quality repairs to get the screw to the perfect length so that when all the screws are tightened down completely, the screw slots all line up in the same direction.