NMO O ring.

superman2112ms

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Jul 26, 2007
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33
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Saint Charles
What size is the O ring for the NMO mounts. Is it in fact an O ring or a flat rubber washer type? The groove in the mount appears to be for a flat ring. Obviously the old one I am looking at is old dried out and flattened. I just want to go to the hardware store if possible.
 

kb2ztx

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Jul 29, 2012
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South West Virginia
its definitely an o ring. Larsen sells a pack of 3 for under $10.00. Do a google search and you will find many locations to get them
 

a417

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Mar 14, 2004
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They are usually toroidal in shape. I'm sure cheaper, knockoff ebay specials might have a flat gasket.
 

N4KVE

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Mar 1, 2003
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3,598
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PALM BEACH, FLORIDA
Depends which o-ring you are talking about. The one that goes in the bottom of the antenna is round. But the one that goes around the NMO mount, & sits on the trunk/roof is flat. My friend keeps telling me since I have the round o-ring in the antenna, I don’t need the flat one that’s on the car, but I use both. The flat ones gets crispy after a year, so I pick up a few at the ham fest, & replace them.
 
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