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my fiber optics won't stay put


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#1 RogerC

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Posted 16 July 2017 - 09:13 PM

The o-rings on my fiber optic cable rotted and fell off. I replaced them with the smallest, thinnest, o-rings I had, but no luck: the new o-rings are so large or so stiff that I can't get them inserted anymore. I took the o-rings off, but now they are really loose and just falling out. I hold them in with blue tape, hair ties, whatever I can find. Nothing works well. Any tips? I think I need to find a source for really small o-rings with a really soft durometer.



#2 blibecap

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Posted 17 July 2017 - 08:56 AM

The o-rings on my fiber optic cable rotted and fell off. I replaced them with the smallest, thinnest, o-rings I had, but no luck: the new o-rings are so large or so stiff that I can't get them inserted anymore. I took the o-rings off, but now they are really loose and just falling out. I hold them in with blue tape, hair ties, whatever I can find. Nothing works well. Any tips? I think I need to find a source for really small o-rings with a really soft durometer.

Hi Roger

 

The o-rings are a Parker size 2-007 5/32" id - 9-32 od 1/16 width or 3.68mm id 1.78mm  width

 

I hope this helps. 

 

bill


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#3 bvanant

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Posted 17 July 2017 - 04:21 PM

The o-rings on my fiber optic cable rotted and fell off. I replaced them with the smallest, thinnest, o-rings I had, but no luck: the new o-rings are so large or so stiff that I can't get them inserted anymore. I took the o-rings off, but now they are really loose and just falling out. I hold them in with blue tape, hair ties, whatever I can find. Nothing works well. Any tips? I think I need to find a source for really small o-rings with a really soft durometer.

Roger: Remind me again what your day job is. This (as opposed to your day job) is not rocket science.  Try the 

http://www.theorings...oducts_id=38900

these are yellow, you can get them in multiple colors as well. About 6 cents each.

 

Cheers

 

Bill


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#4 blibecap

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Posted 17 July 2017 - 06:50 PM

if you want soft ones then you can get them at the same place 

 

 

B50007 -007 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

5/32"ID X 9/32"OD X 1/16"CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...

3785

$0.09

Add: 

Min:  6


Edited by blibecap, 17 July 2017 - 06:51 PM.

Bill Libecap
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#5 RogerC

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Posted 17 July 2017 - 10:15 PM

Thanks, everyone. The smallest size I've tried is:

 

#006 ID:1/8" x OD:1/4" CS:1/16"

 

and it's damn small and hard to get on, but still too big. Mine are hard, though, 70 durometer, maybe something softer would mash flat and make it into the bore.

 

The 007 is a size bigger, guess I'll try a 005.

 

Hey Bill... if there is one fundamental truth in rocket science, it's getting the right size oring, believe me. 



#6 TimG

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Posted 17 July 2017 - 11:57 PM

 

 

Hey Bill... if there is one fundamental truth in rocket science, it's getting the right size oring, believe me. 

 

Brilliant! (and, yeah, sadly true)


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#7 blibecap

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Posted 18 July 2017 - 06:52 AM

Hi Roger

 

Thanks for the reply. You are correct the Parker size 2-007 5/32" id - 9-32 od 1/16 width or 3.68mm id 1.78mm  width is not correct. I went back and remeasured the o-ring on my INON, Sea&Sea, Ikelite fiber optics and they are Parker size 2-006 1/8" 1/4" 1/16". What brand is your fiberoptic cables? The normal durometer is 70 but you can get a softer one, 50 durometer. 

 

On a different subject, yes I understand that rocket science and o-rings are important. Please not that there are two different Bill's trying to provide help with your question. I never mentioned rocket science. 

 

Bill


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#8 azcaddman

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Posted 18 July 2017 - 09:07 AM

You can also order from http://www.divervisi...=howshot o-ring (i've ordered the howshot cable ends, they work fine with generic toslink cables )



#9 EthanStark

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Posted 21 August 2017 - 01:20 PM

"Cheap ones have a circular end and go in easily but tend to fall out almost as easily. Better ones have a rounded off square ends which must be matched to the socket. They only go in when correctly orientated. Make sure you have them the right way round using a magnifying glass if necessary and push them in firmly. They can be quite tight. "

 

Ethan STark