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I've seen these before but I don't know what they're called. It's a two piece insert that creates a through-hole between them.

I drew a picture to help identity it!

enter image description here

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If it is a threaded two-piece item, you'll find it by searching "binder bolt" among other terms:

binder bolt

Image above courtesy of The Home Depot, multiple sources abound, various length are manufactured, various diameters too.

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    $\begingroup$ Apparently the correct term is "sex bolt". Using any of the many other terms might avoid strange looks in the hardware store. $\endgroup$ Nov 13 '20 at 12:39
  • $\begingroup$ Decades ago, these bolts held together ledgers in which bookkeepers managed accounting and finance by hand. As the number of pages increased, binder bolts of a greater capacity were required. The term "sex bolt" is not the "correct" term, just one of many other terms. $\endgroup$
    – fred_dot_u
    Nov 13 '20 at 22:51
  • $\begingroup$ This doesn't look correct as OPs illustration has a through-hole after assembly $\endgroup$ Nov 14 '20 at 9:05
  • $\begingroup$ @JonathanRSwift through hole? or just the hex for tuning the top part? no hidden detail on the drawing to confirm a through hole... $\endgroup$
    – Solar Mike
    Nov 14 '20 at 9:38
  • $\begingroup$ It's stated as being a through hole in the title and the question detail! Circle rather than hex in illustration is not conclusive I agree, but taken together... $\endgroup$ Nov 14 '20 at 10:53
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Found this:

enter image description here

It's called a "Steel Threaded Double Flared Eyelet" Looks like its something jewelry supply stores sell.

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I believe what you are thinking of is probably a copper hollow rivet.

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Type "threaded insert" into Google image search and scroll until you see something similar to what you are looking for, then see what it's called

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  • $\begingroup$ Threaded Inserts don't have a flat end like a bolt. $\endgroup$
    – Trish
    Nov 13 '20 at 21:15

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