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Bob Engelhardt

wrote:
Square nuts are cheap to make, punch/drill the hole, tap, shear off
bar. Any blacksmith could do one in a few minutes. Hex nuts either
require drawn/rolled stock or a mill to mill the flats, plus a lathe
or screw machine to drill and tap.

In the old days. Now I don't think there'd be any difference.

Square heads are also a lot harder
round off, even with really sloppy wrenches. You can also capture a
square nut in a slot a lot better than a hex nut.
....

Good points, both.

Bob