HELP--I need a rubber o-ring 3/16" thick x 1" o.d.

Brian Rupnow · Monday at 2:37 PM

Can't find one in or around Barrie. Everybody has 1" o-rings x 1/8" thick, but nobody has 1" o.d. x 3/16" thick.---Brian

Engineville · Monday at 4:31 PM

It's nice to know that your health has cleared enough for you to be back and posting on this forum.

Sparky_SC · Monday at 4:53 PM

that is a dash 312 size. It may help to inquire by that as well as dimensions.

piper184 · 2025-01-21T09:01:59-0500

Try a Caterpillar dealer. They have a huge inventory of o-rings and can usually get what they don't have in a day or two. When I worked in the parts department we had a stepped cone shaped measuring tool that gave ID and thickness, then a chart to convert that to part number.
Best of luck.

ChazzC · 2025-01-21T10:29:17-0500

McMaster (will have plenty of spares):

O-Rings, 3/16 Fractional Width, Dash Number 312

https://www.mcmaster.com/9452K385

Brian Rupnow · 2025-01-21T11:54:23-0500

I couldn't find a supplier in Canada. I just ordered a pack of 50 o-rings the correct size from McMaster Carr. Had to order a box of 50 of the damn things, but they are only $8.50 USA bucks for a box of them. Thanks for the help boys.---Brian