3M / OS header O-ring size

[Rcmaster199 at aol.com]

In a message dated 5/24/2003 1:11:12 AM Eastern Daylight Time, 
Rcmaster199 at aol.com writes:


> Subj:Re: 3M / OS header O-ring size 
> Date:5/24/2003 1:11:12 AM Eastern Daylight Time
> From:<A HREF="mailto:Rcmaster199 at aol.com">Rcmaster199 at aol.com</A>
> Reply-to:<A HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
> To:<A HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
> Sent from the Internet 
> 
> 
> 
> In a message dated 5/24/2003 12:39:47 AM Eastern Daylight Time, 
> davidflynt at earthlink.net writes:
> 
> 
> >> Subj:RE: 3M / OS header O-ring size 
>> Date:5/24/2003 12:39:47 AM Eastern Daylight Time
>> From:<A HREF="mailto:davidflynt at earthlink.net">davidflynt at earthlink.net</A>
>> Reply-to:<A HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
>> To:<A HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
>> Sent from the Internet 
>> 
>> 
>> 
>> Jim,
>> 
>> Take the piece or the o-rings down to your auto parts store, and ask to see 
>> their o ring collection.  Find the one that fits.  If it is a decent parts 
>> store, they will have dozens of sizes.  I shop at Napa for these.
>> 
>> David
>> 
>> >>> -----Original Message-----
>>> From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On 
>>> Behalf Of Woodward James R Civ 412 TW/DRP/ACQ
>>> Sent: Friday, May 23, 2003 10:11 AM
>>> To: discussion at nsrca.org
>>> Subject: 3M / OS header O-ring size
>>> 
>>> 
>>> Hi All,
>>> 
>>> 
>>> 
>>> Does anyone have a part number or size that I can use to go to the 
>>> hardware store and get some more of the rubber o-rings for the headers?
>>> 
>>> 
>>> 
>>> I've found that if you don't support the pipe and header, they wear out 
>>> fast!
>>> 
>>> 
>>> 
>>> Thanks,
>>> 
>>> Jim W
>>> 
>>> 
>>> 
>> 
> 
> Jimbo, David,
> 
> Just a word of caution. The auto or hardware store variety is probably made 
> of Neoprene or something similar. This type of rubber is okay to get you out 
> of bind temporarily, for a flight or maybe two, but no good long term. 
> Teltale signs of the wrong rubber type are quick wear, flat spots, hardens quickly 
> and cracks.
> 
> You should try to get fluoroelastomer o-rings, like Viton, or silicone 
> rubber. McMaster Carr will most likely have what you need, but you'll ned to 
> measure the ring. The local ACE, as Dave suggests, would be able to get the 
> measurement for you, if you don't have access to a mic or caliper
> 
> good luck
> 
> matt

Jimbo,

I forgot that I have a set of the rings. These measure as follows: 27mm 
ODx20mm ID x 3.5mm thick. That's approximately 1.062 ODx 0.8 ID x 0.135 thick.

Matt
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