Plug thingy?

[pa-dirt_nc-sand]

Found at 1820 - 1910 farm in W PA.

That in advance!

 

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[DCMatt]

My first thought was a freeze plug or safety plug from an early engine. I searched a little but could not find a match.

 

[ANTIQUARIAN]

It almost looks like the broken head off of large brass rivet.
Dave

 

[dozer dan]

I believe that is part of a hydraulic valve. Cast iron housing with a spool in it, then a spring, then this cap and finally a snap ring to lock it all in place.

 

[Noah_D]

Here is a picture of a carriage bolt... it might be a broken off top of one of these or something similar.

 

[bowwinkles]

I think Noah is correct but it is the broken off head of a flat headed carriage bolt like this. https://www.mutualscrew.com/product...MIi8r-lc_g5gIVhZ-fCh3CiAFDEAQYBSABEgJFZ_D_BwE

 

[mick56]

Looks like brass, so probably not a bolt.

 

[bowwinkles]

Looks like brass, so probably not a bolt.

these have that brass look. https://www.google.com/search?q=bra...AgFECQ&biw=1243&bih=538#imgrc=cF5PouV5H-zEaM:

 

[ANTIQUARIAN]

these have that brass look. https://www.google.com/search?q=bra...AgFECQ&biw=1243&bih=538#imgrc=cF5PouV5H-zEaM:

This piece has some age to it, I'm trying to think of what might have used a large square brass rivet back in the 19thc.

 

[bowwinkles]

Many pieces of horse drawn implements had shear bolts like on plows and sickle bars that were brass.

https://www.google.com/search?q=vin...AgHECQ&biw=1243&bih=538#imgrc=nTOcUJwkt6kr7M: