Good place to order orings from?

I’m looking to order some o rings. I need a size chart and good place to order from.

I’ve been getting mine from Fasttech, but their selection is limited to one thickness so far. I think I have most of the black ones they currently offer. I’d like to see thicker ones for lights that have a deeper O-ring channel.
No idea on a size chart, I just measure them and try to get something close.

May not help in u.s. but aldis often has metric,imperial o=ring selection in a plastic case with over( 400) different size and thickness.Last time saw them they were £6.99,or £7.99 .EDIT 400 o rings 32 sizes lol

If using for waterproofing on flashlight threads, i recommend buying slightly smaller then the diameter so it will have to stretch slightly so it doesn’t become a loose wobbly pita

Check out http://www.shaotech.com/o-rings.html (no affiliation)

And here’s my reference for o-ring sizes: O-Rings - Broadley-James

http://dx.com/s/o+ring
http://www.fasttech.com/category/1607/diy-kits-parts-o-ring-seals/?o-ring

If your in the states you can walk into harbor freight.
http://www.harborfreight.com/382-piece-o-ring-assortment-67554.html
http://www.harborfreight.com/397-piece-metric-o-ring-assortment-67580.html
http://www.harborfreight.com/225-piece-nitrile-o-ring-assortment-67677.html

McMaster-Carr is where I buy a lot of miscellaneous parts.

If they don't have the o-ring you want than no one will.