Can someone school me on ordering O rings thru a manufacturers parts diagram?

[Bigragu]

i would like to put together an O ring kit or two for my 30 cal wildcat, but need some guidance on how to identify what the numbers all mean on the FX parts list,



heres an example:

On line item 5125, item #10, o ring 7,5 x 1,5 NBR 70



or line item 5111, item #12 it says o ring 2,5 x 1,5 NBR 90



what does the numbers with the commas mean? NBR stands for? I know what the 90 and 70 mean after NBR, it’s mainly the numbers and commas following.



please help decipher

thank you!

 

[heavy-impact]

These are metric sizes and rubber hardness... 7.5mm ID x 1.5mm cross section. 70 is softer than 90 and those two are all you'll see normally.

 

[Bigragu]

Thanks, Heavy. If they would’ve used a period between the numbers I would’ve asked the question! Why use commas? Is that typically how metric O rings are standardized? With a comma?

 

[Bigragu]

So, based on how I’m understanding your description, am I sketching it correctly?

 

[Lewis]

Exactly!

Love the cartoon!

 

[lbc_PSI]

Most EU countries use a comma instead of a period to denote the decimal place in a number. They use a period instead of a comma to denote Thousands. IDK why..just the way they do it



1,000.52 would be 1.000,52



Since other dimensions in the parts list specify "mm", you could assume the o-ring sizes are metric.

 

[Bigragu]

Ok, thanks, guys, for the guidance. Can’t afford to pull anymore hair out of my thinning nogin 

 

[Bluecup]

While your on the subject does the line through the zero mean anything?

Thank you,

Jim

 

[marflow]

well no you take the inside diameter and add 2 outside thicknesses

so a 7.5mm ID is a 10.5mm OD

it's European thing, when they do Euros, they use commas instead of periods, redundant

go to the o-ring store and you will find everything you need

https://www.theoringstore.com/index.php?main_page=index&cPath=368&zenid=d208c9a7f421b045861726e3a341b850

line through means nothing

all o-ring should be list as ID x Thickness in metric and in inch also and a 6 inch stainless ruler will confirm those sizes

buy yourself a General NO 311-me ruler and shop around, it will be something you will love

 

[Bigragu]

Piggybacking on Jim’s recent inquiry, but after you all address his question, what would happen if a square cut o ring was needed? Like hose bib o ring washers? How would that be denoted? 

In my trade, a zero with a slash thru it means round, usually shown on the blueprints to tell the installer he’s installing round duct. I don’t know if that too applies to your o ring question, Jim.

 

[Revoman]

Bigragu --=--

I had assembled a spread sheet with all Wildcat 'O'-Rings for a 25 caliber, but you can swap out the rings for the 30 caliber (barrel, for instance) as I believe all of the other rings are the same.

https://www.airgunnation.com/topic/fx-wildcat-gen-i-25-caliber-o-ring-spreadsheet/

 

[marflow]

square o-ring size are the same as round but they will say square on them

well your slash o make sense but when it says o-ring it is round

the slash o's could be a way of saying that they are not a fraction of a mm .5mm vs 5mm

https://www.theoringstore.com/index.php?main_page=index&cPath=368_2871&zenid=d208c9a7f421b045861726e3a341b850

how all the companies list seals could be a little different but o-ring is round and square is you guessed it

 

[lbc_PSI]

Maybe this..

https://www.quora.com/What-physical-unit-is-denoted-with-this-symbol-Ø

..so it might mean the Diameter as in OD. idk



Programmers usually put a slash though a 0 so they can differentiate from O.

 

[T3PRanch]

Yes the line is to denote ZERO as opposed to the letter O.

 

[heavy-impact]

So, based on how I’m understanding your description, am I sketching it correctly?

The cross section is added to both sides so 7.5mm +1.5mm+1.5mm = 10.5mm OD

7.5 x 2 = 11.5 OD

10 x 2 = 14 OD

10 x 1.5 = 13 OD

 

[Kdog]

So what size does a daystate Redwolf breech seal need??

 

[Bluecup]

I never thought such a simple thing could be so difficult. Lol I have found that the parts diagrams for the Liberty list the wrong sizes for some of the o rings. Has anyone had trouble with the FX diagram or is it just the way companies list them differently?

Jim

 

[heavy-impact]

Off topic... but while we're exercising which is the best and fastest way to find the area of a circle...

Pi times the radius squared or Diameter x .7854 ?

 

[Bigragu]

Off topic... but while we're exercising which is the best and fastest way to find the area of a circle...

Pi times the radius squared or Diameter x .7854 ?

Okay, I’ve got for you Mr Heavy Impact- pi @ 3.1416, what is that number? What does it mean? And please don’t say Pi was originated by a man named Harry and named his concoction his last name

 

[Bigragu]

well no you take the inside diameter and add 2 outside thicknesses

so a 7.5mm ID is a 10.5mm OD

it's European thing, when they do Euros, they use commas instead of periods, redundant

go to the o-ring store and you will find everything you need

https://www.theoringstore.com/index.php?main_page=index&cPath=368&zenid=d208c9a7f421b045861726e3a341b850

line through means nothing

all o-ring should be list as ID x Thickness in metric and in inch also and a 6 inch stainless ruler will confirm those sizes

buy yourself a General NO 311-me ruler and shop around, it will be something you will love

Marflow! Thanks for catching my error, man! I forgot to add the thickness twice! Man, I’ve gotten rusty, as I taught all the math for the sheet metal trades, and perimeter, area/volume, is a big part of the math. Thanks for the correction. Yes, I feel like my cartoon!