Forgive me, noob Oring question (identification related)

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_CTAIRGUNNER_

_CTAIRGUNNER_

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May 30, 2022
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So I am currently putting together Oring kits to have on hand for my Evol Collection, with that said, I am a dope and am having a hard time making sure I am ordering the right ones.

Slayer said you can use the middle numbers C-025-122-21(highlighted and underlined) in his part numbers to source the orings , that particular one is Viton 90 Durometer, when I search on places like oringsandmore , results come up but multiples do and I am having a hard time distinguishing, orings are not something ive ever had to source except via manufacture part number and I am probably way over thinking this.
 
Your frustration is completely understandable. The vast majority of PCP rifles are manufactured overseas and use Metric size orings. While some have said you can use a -122 or whatever SAE size oring it will work, the fact is it is Not metric snd it could work but not worth the effort to do it wrong when metric is easily available.
Durometer: simply said how hard is it. For Static orings using 70 D or 90 D will not be an issue. For Dynamic applications...sliding surfaces like a plunger or spool, 90 D is preferred due to it's resistance to extrude into a gap tolerance between surfaces.
MATERIAL: The Big debate...buna N, High Nitrile Buna n. Viton, and many many more. Because you are Not to use petroleum based products on PCP's for flash point reasons..you would best be served with using Viton across the board..Buna will also be fine in most cases.
Do your research on Metric measurement of orings...oringsandmore explanation is very good. It determines O.D. the I.D. and C.S. cross section.
OIL: The most important consideration.
Hope this helps feel free to ask any questions at all. I will offer my opinions. I'm a retired Hydraulic engineer from a global manufacturer of Hydraulic equipment.
 
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Camaro454 said:
Your frustration is completely understandable. The vast majority of PCP rifles are manufactured overseas and use Metric size orings. While some have said you can use a -122 or whatever SAE size oring it will work, the fact is it is Not metric snd it could work but not worth the effort to do it wrong when metric is easily available.
Durometer: simply said how hard is it. For Static orings using 70 D or 90 D will not be an issue. For Dynamic applications...sliding surfaces like a plunger or spool, 90 D is preferred due to it's resistance to extrude into a gap tolerance between surfaces.
MATERIAL: The Big debate...buna N, High Nitrile Buna n. Viton, and many many more. Because you are Not to use petroleum based products on PCP's for flash point reasons..you would best be served with using Viton across the board..Buna will also be fine in most cases.
Do your research on Metric measurement of orings...oringsandmore explanation is very good. It determines O.D. the I.D. and C.S. cross section.
OIL: The most important consideration.
Hope this helps feel free to ask any questions at all. I will offer my opinions. I'm a retired Hydraulic engineer from a global manufacturer of Hydraulic equipment.
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That did help a ton! I worked on ariel lifts for Altec for a long time and worked in the automation field with pneumatic actuators and whatnot but whenever we had to get an oring we had manufacturer kits on hand so we never actually had to look for what it was beyond the manufacturer number.
 
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CTairgunner1288 said:
That did help a ton! I worked on ariel lifts for Altec for a long time and worked in the automation field with pneumatic actuators and whatnot but whenever we had to get an oring we had manufacturer kits on hand so we never actually had to look for what it was beyond the manufacturer number.
Click to expand...
Very cool. I worked mainly in large industrial applications but did do a lot of wok with Deere industrial and Komatsu mining equipment. Deere used Viton almost exclusively and almost always 90 durometer covering all applications. Today, a treepan gooove is used with face seal orings for very positive seal.
 
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even though some metric guns use inch Oring makes little difference because an inch Oring has a metric size, you see Orings in a metric gun at 2.62mm cross section well that is a inch size 3/32

i have been using The Oring Store for years and if the sizes you have or think they are can easily be cross check and if the 122 number does not match you will have to start over

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