source for rubber washers or gaskets

[RalphStirling]

I'm looking for an inexpensive source for thin rubber or silicone
washers or gaskets to seal 26mm and 20mm optics. I'll be machining
custom bodies for a single cell (3.2v LiFePO4) Cree XRE lights, using
Carclo or L2 optics. The only source for suitable thin washers I've
found so far is http://www.metrogasket.com , and their minimum
order is kind of steep. The two sizes of washer I'm needing are
1.063"OD x 0.938"ID x 0.031" thick and 0.891"OD x 0.766"ID x 0.031".
I could adjust these dimensions slightly if necessary.

Any suggestions would be appreciated!

-- Ralph

 

[donn_]

Try McMaster-Carr

 

[EngrPaul]

yep, mcmaster has the best variety of silicone metric.

 

[RalphStirling]

My searches of McMaster haven't turned up anything useful.
The silicone washers they list (all 11 of them) are .093" thick,
and have a 2:1 OD/ID ratio. That isn't going to be much good
for a flashlight. I've also check Grainger and MSC without success.
I'm hoping there are other specialty suppliers out there that might
have lower minimums than metrogasket.com .

Thanks,
-- Ralph