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Nightgaunt 07-28-2009 04:56 AM

O-ring sizes
Hello everyone.
My cousin found old VM-68 somewhere and gave it to me to check it out and fix it if it doesn't operate properly. Since it has seen better days and most likely hasn't seen any kind of maintenance for years I decided i would disassemble it, check out if the parts are allright, chance the O-rings to brand new ones and lubricate it properly.
Now here's the problem: I can't find info about what sized O-rings I should get for it. I've read that there are places where you can buy the complete set of O-rings for VM-68 but the problem is I'd have to order it overseas to Finland and I'm not willing to do so right now. Local paintball stores are no help.
So, does anyone have information about the O-rings or is there a site in the internet where I can check it out?

HyePower 07-28-2009 05:38 AM

First of all, welcome to MCB!

These two websites have tons of information on the VM68:

Vm Empire v2.0

Palmer's has what you need, I'm sure they will ship to Finland. I know you don't want to order overseas, but this is all there is I believe.

VM68 / PMI 3 Seal Kit [SHER061] - $30.00 : Palmers Pursuit Shop!, Where Custom Still Means Something

Another person on this forum also has o-ring kits, American Paintball has them too.

Nightgaunt 08-02-2009 01:10 PM

Allright, that helps a lot. Thanks!

Dave-D 08-09-2009 11:41 AM

Hye Power has it right.

If you can find the o-ring sizes in those linked sites similar sizes might be available in your local hardware/plumbing supply store. It would be worth a shot.

souz4402 08-09-2009 01:29 PM

the oring on the front of the bolt is non-standard...u wont find it at your local hardware store

save yourself the trouble and order the kit from palmers

CrazyGeoff 02-14-2013 10:24 AM

Riving an Old thread. Finding the right o-rings isn't the problem. Need the correct sizes to place an order.


Drumbum675 02-14-2013 02:19 PM

exactly, Mcmaster Carr has any o-ring you need. Problem is no one wants to tell people what the correct sizes are......

Sneak 02-14-2013 04:39 PM

Hang tight, I'll dig out my calipers. Bear in mind that i can't till you what the durometer is, as I have no way to tell. Diameters will be as close as i can figure as they're a little worn.


Barrel Oring
X-section: .097"
OD: 1.0335"
ID: .8315"
Groove seat: .902"
Body ID: .9305"

Hammer Oring
Thickness (laying down top view): .995"
Height (laying down top view): .072"
OD: .730"
ID: .525"
Groove seat: .579"
Body ID: ~.745-.756"

Valve Oring

Since the one Oring broke while I was removing it, I can only give you the diameters from the body & groove in the valve

X-section: .0675"
Groove seat: .6345"
Body ID: ~.745-.756" (too deep to actually measure, estimated from valve OD)

Bolt Oring

I have an aftermarket TASO bolt, but I'll give the known measurements.

(Stock Oring from palmers)
X-section: .1015"
OD: .633"
ID: .686"
Grove seat:?
Body ID: .686"

Aftermarket TASO Bolt Oring

X-section: .102"
OD: .6455"
ID: .440"
Groove seat: .4955
Body ID: .686"

All measurements are +/- .015 since i have crappy digital calipers, and the Orings flex a bit/are a little out of round.

I hope this helps.

Drumbum675 02-14-2013 09:41 PM

Very cool. Thanks!

Sneak 02-14-2013 10:43 PM

Np. I just found out that you can substitute tank Orings on the valve without issues.

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