Apeks TX50/TX100 balancing chamber O ring size?

[beanojones]

Apeks TX50/TX100 balancing chamber O ring size?

It's a tiny size that I cannot seem to match to any of the numbered sizes.

Anyone know what size and/or standard number that O ring is?

 

[ianr33]

I asked the same question a while back and got this excellent answer (I *think* we are talking about the same O ring)

http://www.scubaboard.com/forums/3781097-post24.html

 

[beanojones]

Did anyone report back to say it was in fact a 002?

 

[Couv]

Well,

If I read in between the lines correctly, yes it is a -002. But if you have one already and want the specs here a little chart for you.

.....Edit....not able to post the chart, but here are the specs for a 2-002


Dash# 2-002 id 3/64 od 9/64 c/s 3/64

 

[beanojones]

Those charts are useless for people like me without sizing calipers.

The Trident Catalog has a pretty decent chart on page 10 that's an actual sizing chart. But using that, the Apeks O ring is not even close to a 002. It's about half the thickness, and a larger diameter.

The Apeks O ring is essentially the 003 with half the thickness of material. Maybe an 002 will stretch to fit but.

I wonder if it is one of the British standard O rings?

 

[beanojones]

I just ordered my full spare O ring store, and I can say pretty definitively (Unless McMaster-Carr has badly mislabeled their Orings) that it is not an -002, but the odd size -001 1/2.


Buna-N ------- Shore A: 70 ------ $2.82 per Pack of 100
Viton ------Shore A: 75 ------ $8.80 per Pack of 100
Silicone ------Shore A: 70 ------ $7.50 per Pack of 100
EPDM (Ethylene Propylene) Shore A: 70 ------ $10.00 per Pack of 25

I just got 100 of these in Buna-N. If anyone wants to spec it out for their own uses, just PM me an address and I'll put some in an envelope for you to see if they match like the SP balancing O ring or whatever.