Unique Titanium
Results 1 to 11 of 11

Thread: Best Way to Shrink an O-ring?

  1. #1
    Flashaholic* AFAustin's Avatar
    Join Date
    Oct 2004
    Location
    outside of Austin, TX
    Posts
    1,799

    Default Best Way to Shrink an O-ring?

    I know I've read this before, but don't remember the particulars and my search turned up zilch.

    Is the best way to shrink a loose O-ring to simply put it in the fridge for a while? I don't want to make it brittle, so any tips/tricks would be appreciated.

    Thanks.

  2. #2
    *Flashaholic* Flying Turtle's Avatar
    Join Date
    Jan 2003
    Location
    Apex, NC
    Posts
    6,388

    Default Re: Best Way to Shrink an O-ring?

    Don't know if it would work, but rubber shrinks when heated, unlike most things.

    Geoff

  3. #3
    Flashaholic* will's Avatar
    Join Date
    Apr 2004
    Location
    New York
    Posts
    2,578

    Default Re: Best Way to Shrink an O-ring?

    I have never heard of shrinking an 'O' ring - I would suggest getting a new one, plumbing supply, home depot - places like that.

    I have a bunch for the different maglites -
    Now I can see the darkness .

  4. #4
    Flashaholic*
    Join Date
    Mar 2002
    Location
    New Jersey
    Posts
    1,750

    Default Re: Best Way to Shrink an O-ring?

    Quote Originally Posted by Flying Turtle
    Don't know if it would work, but rubber shrinks when heated, unlike most things.

    Geoff

    But the rubber will likely harden when it cools.

  5. #5
    Flashaholic* PEU's Avatar
    Join Date
    Feb 2004
    Location
    Buenos Aires / Argentina (I like ribs)
    Posts
    3,551

    Default Re: Best Way to Shrink an O-ring?

    most orings arent rubber anyways... good orings are made of nitrile, viton, buna-n and others, these materials are resistant to a lot of chemicals...

    As Will said, you better purchase the proper size oring.


    Pablo

  6. #6
    Flashaholic* AFAustin's Avatar
    Join Date
    Oct 2004
    Location
    outside of Austin, TX
    Posts
    1,799

    Default Re: Best Way to Shrink an O-ring?

    Thank you, gentlemen, for your replies.

    Actually, these are a couple of the o-rings that came installed in my new Lumapower MRV. I probably should just request a couple of spares from Matt at Batteryjunction---he is most helpful on this kind of thing.

  7. #7
    Flashaholic* TORCH_BOY's Avatar
    Join Date
    Jan 2004
    Location
    Australia, Vic
    Posts
    4,243

    Default Re: Best Way to Shrink an O-ring?

    Leave it out in the Sun for a few days?

  8. #8
    Flashaholic* Echo63's Avatar
    Join Date
    Apr 2004
    Location
    Perth - West Australia
    Posts
    1,602

    Default Re: Best Way to Shrink an O-ring?

    cut a small section out of it and then superglue the ends together
    (dont do this if you need to maintain a waterproof seal)
    flashlight collector by day
    flashlight user by night

  9. #9
    Flashaholic Theatre Booth Guy's Avatar
    Join Date
    Jan 2006
    Location
    Michigan, USA
    Posts
    344

    Default Re: Best Way to Shrink an O-ring?

    Your best bet is to find one of the quality "old fashioned" hardware stores that stocks everything - take the part that needs the o-ring. Find the right size and maybe pick up a spare too.
    IMHO, you would not want to trust any o-ring that has been "shrunk" or changed from the way it was manufactured.
    Brian

    After getting an HDS, other flashlights seem much less relevant (Except for some of the really special lights found on CPF!)
    When things are really dark, a dim light for a long time is much better than a blinding light for a short time.

  10. #10
    Flashaholic* AFAustin's Avatar
    Join Date
    Oct 2004
    Location
    outside of Austin, TX
    Posts
    1,799

    Default Re: Best Way to Shrink an O-ring?

    Thank you, gentlemen, for the additional replies.

  11. #11
    Flashaholic*
    Join Date
    Mar 2002
    Location
    New Jersey
    Posts
    1,750

    Default Re: Best Way to Shrink an O-ring?

    You can buy o-ring assortments cheaply. There may be some in the assortment that would fit. I suppose the most critical dimension is the thickness.

    Here's a cheap kit on eBay. It looks like the one I bought:
    http://cgi.ebay.com/407-O-RING-ASSOR...QQcmdZViewItem

    What he calls OD is what most people call thickness. And what he calls the sizes are what most people call the ID. At least I think that's the deal.

    It's confusing because an o-ring has two OD's and one ID. (outer diameter and inner diameter). To make it worse, they are available in metric and English-American sizes.
    Last edited by eluminator; 05-30-2007 at 11:56 AM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •