What is the difference between a .012 and #7 o-ring?

[runsongas]

the danco orings are buna nitrile. relatively soft, i think 60 or 65 duro. not my first choice as bulk viton duro 75 orings from mcmaster carr are 6.82 for a pack of 100 or less than 7 cents per.

 

[divad]

What were you going to do with it? I would have no qualms about using it in an LP, air, static application. I might even give it a try in other applications that are not too challenging.

WooHoo, 49 cents here I come!

OK, here's my attempt at succinctness;

1. On a dive, my inflator button started leaking around the outside edge of the inflator cartridge (which was encrusted with verdigris (I finally noticed).

2. I extracted the cartridge so I could replace all the o-rings with a VITON o-ring inflator kit (which I bought for the wrench).

3. I could not disassemble the cartridge without something stronger than my hand to hold the button.

4. Since the leak was on the outside of the cartridge I replaced the larger static o-ring (-012) closest to the button.
That stopped the leak. I went for a dive. (Yay)

5. Later, I disassembled the cartridge and accidently damaged the new Viton o-ring. (Boo hoo).

6. I soaked the cartridge parts over night in white vinegar which virtually dissolved the verdigris, leaving the copper undercoating where the nickle-plate had worn off (allowing the verdigris to form).

7. I decided to put the cartridge back together and use it as a temporary save-a-dive cartridge for salt water or fresh water, instead of trying to remember which wing had the mostly copper-on-brass cartridge.

8. Today I took a cartridge from another Halcyon wing, installed it in the one with the bad cartridge, and went diving (Yay)

9. I have to lie down now.

 

[Couv]

They're the same size. Is it the material/application, e.g., dynamic vs. static?
Thanks

The "Usual" sizing standard seen for o-rings is AS568 which is an Aerospace standard. There are other standards such as AN 6227 that have the same size o-rings but with different designations.

Why? I don't know. As to it's effect on quality-I don't know that either.

At work, (aircraft mechanic) I sometimes have to replace seals and upon looking it up, I am sometimes surprised to find a seal I was "sure" was a -011 or -012 turns out to be a 6 or 7. THEY are just trying to confuse us.


I'll list a few examples below.

I cannot get the formatting to cooperate so in the table below the first column is the AN 6627 number, the second column is the AS 568 number

AN 6627/ AS 568
5 / -10
6 / -11
7 / -12

 

[divad]

THEY are just trying to confuse us.

lol......