Square Nuts might still be hard to find in the right size. more than 25 years ago, I made 144 square nuts from scratch, starting with slabs or bar stock, for a cannon my friend was building. I finished them in about 4 hours of work using his bandsaw, and drill press, then his tap. He was elated that I got them all made so quickly. He told me he was sure we would have to replace the tap many times, and was shocked that I not only didn't break his tap, but it was as good as new when I finished. He was busy with Larry, another friend, measuring, cutting, welding, and fitting capstands to hold the trunions on the barrel to the carriage. The tongue was made of large slabs of Oak, and they were narrower at the axle, than back where the tongue set on the ground. That produced compound angles that required a lot of work to make the welded capstands fit properly.
We had searched every source locally, and then called around the country after checking with some of the better known suppliers, and came up blank. This was before the internet. They were for 1/4-28 tpi screws, and his blueprints called for all of them to be used on his cannon carriage.
I will never take for granted the cheap cost of buying nuts at my hardware store again. :shocked2: :bow: :grin: :thumbsup: