Found this in field across from my house in central Tennessee where it is rumored that the army used to have maneuvers there and buried their stuff when they got done. I think it is older than that but would like some more information and pictures of others
looks like some type of lock... we use a homemade one similar to that to hold a trailer tailgate up/on, unthread to open then thread back on to keep shut
Too old to be trailer lock and the shank on the bolt is square as if to go into a piece of wood or slotted metal, thanks for the input I hope to figure it out
Let me point out that the nut looks to be blacksmith made and not modern machinery. The shank appears to have been ponded through metal on the fist portion of the squared shank. If you blow the picture up you will get a better idea of how it is made
The end of the mystery!! Figured out that this is the bolt that holds the plow point on to an old mule drawn bull tongue plow. Found one on eBay just like it and other pictures with the same style nut holding others together.