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O-Ring sizes?

gas lm4 o ring leak

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#1 Ataem

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Posted 10 December 2012 - 06:02 PM

I recently went to a local Harbor freight, and bought some o-rings. unfortunately, they don't fit the things I have tried so far. does anyone know the o-ring sizes for anything? and where to find them?

#2 MuchMoore

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Posted 10 December 2012 - 08:32 PM

You need to buy the kit with the green o-rings. Search a bit on here and you'll find exactly the right ones.

#3 dos_Santos

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Posted 10 December 2012 - 08:50 PM

You can actually do it your self.  Get a measuring device, like a metal ruler, that has increments of at least 1/16th.  Measure the thickness of the o-ring (called cross section or CS), measure the inside diameter (ID) (inside to inside wall of o-ring), and sometimes the outside diameter (OD).  You'll have to eyeball the o-rings with small CS, as the ones on the valves are 1/32".  Then go to a store with a ton of o-rings and see if you can find the one you need.  1/32" is not common, but let us know if you can find it.  I have a quote for the large o-ring on the release valve for $2.80 each for 50+ o-rings.  It would be a custom order.

#4 Ataem

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Posted 11 December 2012 - 06:36 AM

I found a kit of hnbr ones, i was mainly looking for the fill valve o-rings, but none of them fit. and I have a dial-caliper I could do the measurements with, now it's just up to finding them.....but where?

#5 MuchMoore

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Posted 11 December 2012 - 06:39 AM

I believe someone mentioned that Danco had the appropriate sized o-rings for the mags available.

#6 Ataem

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Posted 11 December 2012 - 06:55 AM

they may, but the only place i see danco o-rings are at lowes, and they dont have the whole selection.

#7 netpoc

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Posted 11 December 2012 - 07:05 AM

Ace Hardware


#8 Ataem

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Posted 11 December 2012 - 07:59 AM

i'll try there netpoc, I thought there was a thread a long time ago that someone mentioned the sizes, but I don't remember where.

#9 netpoc

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Posted 11 December 2012 - 12:19 PM

60 and 61 for the tip of the release valve. I don't know the size of the base. If you find it can you post it here?

#10 akiraspeedstar

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Posted 11 December 2012 - 12:38 PM

Also using those Dancos on the release valve work wonders! It seals 1000x better than the standard size o-rings

#11 netpoc

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Posted 11 December 2012 - 12:45 PM

Hmm good to know. Akira, do you know the size of the o-ring on the base of the release valve?


#12 dos_Santos

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Posted 11 December 2012 - 06:55 PM

It's 1/32" (cross section) x 3/8" (inside diameter)





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