Help dating hardware

Hoping someone may be able to help date these screws for me. It looks like you would have stuck a little rod in the side of the screw and turned it from there to tighten it down. Not sure when threaded screws started being used? Dug it out of a field last night. The property is adjacent to a road that saw use pre revolutionary war. It’s full of square nails so I assume there was either a home or barn there at some point. There was a great old stone foundation barn across the street in another field that blew over in a hurricane when I was a kid. Last night was the second time I metal detected in that field and I pulled out the second of two large copper coins last night. Unfortunately last nights was even more roached that the first. Not one legible anything anywhere. The first one I could make out two letters somewhere at least. This one has nothing left. It would have been really neat to get a date on one of them or enough to go on to figure it out. Was definitely hoping for colonial copper but I have a feeling they are probably English from a bit later down the line. It will be interesting to see when these screws date to. I assume 1800’s. Found a bunch of pieces of horse or ox shoes last night too. Those are pretty easy to date usually so I’ll look them up too. Last nights pieces are pretty beat up though so maybe not as easy as I’m hoping.

Also a metal ring, any idea what used for? Furniture drawer/door pull?

 

Looks like a Chippendale drop pull to me (colloquially known as Bat Wing). The holes in the threaded studs are where the drop handle would slide in and hinge from.

@verybrad and @James Conrad would be better to place a date on them, but you can search with above criteria for now...

 

Something like this:

 

You’re definitely right that the handle slid in/hinges in there! Thanks for pointing that out! Terminology definitely helpful too. The interesting thing is that on all the others I am seeing so far (just 5 mins of looking granted) the holes are built into the brass plaque part not the stud/screw.

Edit: actually maybe these were too and they just broke off with the stud/screw.

 

Some were fastened in some way to the backing. Others were separate and held together by pushing the stud tight to the backer, and tightening the nut behind the wood on the drawer.

Tough to say on your piece which way they were configured.

 

The threaded part is called a "post", the handle that is missing is called a "bail". Can't really tell much about the age of this chippendale pull like stamped plate brass or cast brass as it's in pretty rough shape.
I would note that virtually all of American furniture brass hardware in the 18th century was imported from England, the colonists were not allowed to have foundries.

 

Strangely, I just posted a pic of one of these plates (that has never been buried) in another recent thread to show what they look like: https://www.antiquers.com/threads/old-furniture-brasses.45398/#post-1443030

The one I show is the backplate only. But you have two of the threaded posts as well. The earlier ones were always made in separate pieces like this. You are likely to have early ones (though they continued to be made in this style even today if you are willing to pay for them):


You apparently have two different styles - the larger piece is one style, and the two smaller pieces are broken off of a different style backplate. It was common to replace furniture hardware either to upgrade to the latest style, or to change out all them when one or two of the old ones broke. Unlike today, the removed bits were often put aside, for "later". The fact that there are two different styles, along with the mixture of other bits you found, makes me think these may have been removed from pieces of furniture and put aside, possibly in a shed or barn. So they may predate the structure that used to be there.