Yet another mystery brass screw found

[jsandin]

I seem to find a lot of odd brass screws.

This isn't as interesting as the last one, but what is it? It's hollow, and heavy for its size. See coins for comparison. It's small. It looks like a tiny oil plug. The hex head is solid with no hole and no markings.

Found it about 3" deep in a creek bank in a park.

The other thing is another whatsit....it feels lighter than aluminum. Like it's metallized plastic or magnesium.

 

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[lostcauses]

plumbing fitting for a automotive gas or break line most likely. Also used in gas appliances, like stoves.

 

[ipsilateral]

These were used to attach the rudder to the Mayflower.

 

[72cheyenne]

The brass piece is either a 1/4" or 3/8" NPT brass hex plug. Still made today. http://www.airoil.com/v6/index1.html