O Rings?

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INFIDELxx

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I'm starting to DIY all my Equipment. I'm not to savvy on O rings yet. I'm looking for some references that can bring me up to speed.

Some of the things i'd like to learn are:
1. What the required type for Different gases.
2. What type of lubes for specific O rings
3. What to look for before replacement
4. When I begin Nitrox what must i do

Thanks for the help.

NEVERMIND I FOUND IT ON DIVE RITE>>>>
 
Last edited:
I'm starting to DIY all my Equipment. I'm not to savvy on O rings yet. I'm looking for some references that can bring me up to speed.
When you're needing some o-rings, Harbor Freight has a kit of 70 durometer viton rings for very cheap. It's missing a couple of common scuba sizes, but has most, and for the price, it's saved my butt in a few regulator rebuilds. 180 pieces for $17 beats most places.

For the random sizes (and other good stuff!) I highly recommend http://www.smallparts.com. Their site has all kinds of useful parts, and they sell in onesies twosies... it's where I usually make up the rest of the kits I need - and get the 90 duro stuff when I need those, too. It's also handy to pick up some blunt tip syringes for dispensing christo-lube into tight locations.

BTW - for general purpose scuba gear, there's little point in NOT using "nitrox" compatible lube and rings. It saves a lot of hassle later on and the cost differential really isn't significant. O-rings are cheap enough, too, that my general rule is "if you pull it out, just replace it."
 
Definitely use either Nitrile or Viton O'rings, any good bearing shop will also sell o'rings. I also use Krytox lube which is Nitrox safe, it's a bit expensive and sometimes hard to get but a tube lasts ages.

Generally, manufaturers specify that you should always replace the 'dynamic orings' (ones that are sliding/rotating or moving) and replace the 'static' orings (ones that are compressed between two parts) on condition, but as Camerone mentioned o'rings are extremely cheap in the scheme of things so just replace any you disturb.

Common sizes you'll need are: (assuming this is internationally standardised)

003 - Used on the High pressure swivel at the guage end
010 - Used on second stage end of the hoses and in the inflator hose connector and inside some regs. Common on most knife edge seats in second stages.
011 - Used on the First stage end of the hoses and the port plugs except the HP hose.
012 - Used on the HP hose at the first stage and HP port plugs
014 - Moderately common tank valve oring
114 - Very common tank valve oring in Oz

013, 016, 022, are also pretty common but can be reg dependant.

214 is the one at the base of the tank valve in the tank. You should always get this one done when your tank is in for test.

It may also be worth checking into servicing kits for your particular brand of reg. You should replace your High Pressure and low pressure seats pretty regularly, along with diaphragms and a few other bits n pieces. More often than not these days the manufacturers produce these kits with all the bits they want replaced on the annual service and charge a premium for seperated parts so you pay more for the individual bits than you would of for the kit. You will more than likely still require the hose oring sizes though.

It's worth buying the specialist tools you require for a particular reg as well, I've seen several first and second stages scrapped from incorrect tools.

If you need a what too look for list let me know and I'll write some guidelines out for you but it might be easier if I knew what you owned.

To prep for nitrox you need to make sure you get rid of all the silicone grease from every little nook and cranny. You will need some kind of strong industrial detergent that is safe for humans, best to go with something along the lines of what they use in the food preperation industries...aslong as it's not part bleach...

If your going to be doing this regularly it will be well worth you investing in an ultra sonic cleaner, just don't stick your fingers in it while it's running....

Good Luck

Woz
 
With the exception of 003 I think you are looking for 90 durometer which will not be as frequently stocked locally.

I just got a load from O rings online. For very small money you can lay in a generous stash.

Pete
 
When you're needing some o-rings, Harbor Freight has a kit of 70 durometer viton rings for very cheap. It's missing a couple of common scuba sizes, but has most, and for the price, it's saved my butt in a few regulator rebuilds. 180 pieces for $17 beats most places.

They sell that in the stores? Gotta pick that up.
 
I sell also single pieces of shore 90 viton ORings if anyone need. It seems in some areas they are very easy and cheap to get while in other places of the world they are almost unknown.
 
I sell also single pieces of shore 90 viton ORings if anyone need. It seems in some areas they are very easy and cheap to get while in other places of the world they are almost unknown.

It looks like from a qick gander at your website, that you mght also sell LP seats and Diaphragm rubbers. Do you?
 
It looks like from a qick gander at your website, that you mght also sell LP seats and Diaphragm rubbers. Do you?

not at the moment. We just start to make refill able filter for compressor and valve service kits. But we are on the beginning with that, a lot of testing is necessary before we can offer that for public.

In generell we are a hydraulic/pneumatic sealing company. So we are strong on the orings but not on other things.

Thanks
h90
 
So to order a bunch of O-rings, can we just send you a set and say "30 of each of these"?
 
https://www.shearwater.com/products/perdix-ai/

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