Tom H

Thanks. I have a couple of similar wrenches and assumed that was their original purpose but just wondering if anyone knew for certain.

Does anyone know if post drills were supplied originally with a wrench to change out the drill bits? Usually 3/8" square. If so, what do they look like?

I don't recall ever hearing of A-3 steel. Likely a manufacturing batch number.

Based on application, I would guess med carbon steel that has been heat-treated. Maybe pre-hard.

What he said. Get a length and you will have a good supply.

Those are called FILLISTER HEAD machine screws, if that helps your searching.

Read above posts

What he said! Since you have 5/16 round, make something out of 1/4 square. Squaring the stock leaving a good finish is excellent practice.

Why 1875? Why not 1775? Use wrought iron only, (preferably made on location), ditch the safety glasses, make your own files, turn off the lights, etc.,.,. Do it however you want to. Nothing will be made EXACTLY like it used to be, not even at Williamsburg.

Screws, (or nails), don't hold well in end grain.

"You can't put nothing on the internet if its not true" "Oh look, here comes my date. He's a French model." "Bonjour"

Quick and dirty calculation. Think Chevy 283. Most steel weighs .283 lbs per cubic inch. Calculate the volume and multiply by the old Chevy .283.

Might run across a deal on a vise with stripped threads that yours will fit. The screw and box are definitely worth hanging onto. Keep on the lookout for another vise.

I think Moe said that to Curly.

Notice the 'old tyme' threads on the screw. I imagine the screw box also has the brazed thread elements. Nice example of the earlier method of manufacture