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Custom Size Ring Question

 
 
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United States
4 Posts
 Posted 07/10/2019  12:39 am Show Profile   Bookmark this topic Add bordbord to your friends list Get a Link to this Message
I want to use a 5-hole US Mint State Quarter lens to display 4 bison quarters (ND, KS, MT, Yellowstone NP) and a 2005 bison nickel. I looked for something to use as a ring for the nickel, and found on eBay some rubber nitrile O rings which I think would work--the O ring has an I.D. of 21mm, an O.D. of 24mm, and a thickness of 1.5mm. But I have no idea if using a nitrile ring this way is a good idea or not. Not that it really matters that much with an inexpensive coin, I guess. Any info appreciated.
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United States
28056 Posts
 Posted 07/10/2019  04:36 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
to CCF. Can you post a pic of the o ring. I know they make foam rings that fit in plastic coin holders.This is what I am referring to https://www.ebay.com/itm/Box-of-10-...AOSw2s1UuBfO
John1

PS: Here is an idea if you want to custom cut https://www.gamut.com/c/raw-materia..._content=All
( I'm no pro, it's just my humble opinion )
Searched 5+ Million Cents Since 1971
Edited by John1
07/10/2019 10:13 am
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United States
18151 Posts
 Posted 07/10/2019  09:13 am  Show Profile   Bookmark this reply Add just carl to your friends list Get a Link to this Reply
A place called Harbor Fright sells large quantities of rubber type O rings in boxes. Some are all metric and some are all what ever they call non metric sizes. Really sort of cheap too. All are sorted by size and many, many sizes are available.
just carl
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United States
28056 Posts
 Posted 07/10/2019  10:07 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
Make sure whatever you use does not mess with the metal of the coin.
John1
( I'm no pro, it's just my humble opinion )
Searched 5+ Million Cents Since 1971
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United States
927 Posts
 Posted 07/10/2019  11:26 am  Show Profile   Bookmark this reply Add llewellin to your friends list Get a Link to this Reply
Many rubbers offgas sulfur and will tone silver quite severely. Modern coins' cupronickel seems to be somewhat less reactive so less of a concern, but still I would lean towards a stable plastic or foam instead of rubber
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 Posted 07/10/2019  3:24 pm  Show Profile   Bookmark this reply Add Dorado to your friends list Get a Link to this Reply
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 Posted 07/10/2019  5:29 pm  Show Profile   Bookmark this reply Add bordbord to your friends list Get a Link to this Reply
John1, attached is a photo of the O ring I ordered on eBay.

I tried using scissors to trim one of those foam Air-Tite T-21mm rings down to 24mm O.D., and the result is functional but very uneven, to put it mildly. I'm not sure any custom work I would try on anything else would work out any better.

I may just avoid using an O ring to be safe, even on a circulating nickel. Apparently nitrile is relatively inert compared to regular rubber. I found this online: "Nitrile rubber is used in a wide variety of applications, such as O-rings, gaskets, oil seals, automotive transmission belts, hoses, V belts, synthetic leather, disposable non-latex gloves, printer's form rollers and cable jacketing." But of course there's nothing in there about its potential interaction with copper and nickel.

Thanks for everyone's comments.


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