Scubapro O-ring Sizes

[Zung]

If you're talking about shims, I'd be interested to learn about alternative sources, even though I have no burning need for them right now, with a large stash of 2 (two) spares.

 

[Texfrazer]

I'm always up for some spare parts (or shims or seats, etc.).

 

[Zung]

Here's an updated MK20/25 schematic with o-ring material, sizes of the springs, sizes of the wrench and keys, and modified torque specs for the seat retainer: the original schematic says 22 ft-lbs, but the retainer itself has 11 ft-lbs engraved.

 

[Zung]

On behalf of couv, with o-rings sizes and material.
Please proof this within 24H, after that it'll be locked down for eternity!

 

[aikiguy]

I have been Lurking and learning here.

I want a copy of the secret book just because it is a secret book!

However I like reading what all of you are writing a lot! I think that you guys might be better than the secret book!

Awap: :cool3::cool3:

Thank you all for posting....

If you get out this way, SF Bay give a shout! I would definately be up to shouting a or possibly a sail on the bay!

Guy

 

[Zung]

MILLERJE just pointed me to oringsUSA, and I noticed they now sell the -010 PU90 by the piece at $.22 a pop.

awap, are these the ones you were talking about, those that break when you squeeze them?

 

[superstar]

Jung, can you do a link to orings usa's website for us.

 

[Zung]

Here's the -010 PU90, and here's the 2.5x1mm V75

Me I've just order the same at McMaster at twice the price

 

[aikiguy]

I am new to this, but wouldn't you use Buna-N ones

Buna-N

instead of the "Millable Gum" ones in the link?

And wouldn't it be even better according to Scuba Pro to use polyurethane per the advert that the mk2 had been "Upgraded with Polyurethane O-rings"?

Thanks,
Guy

 

[halocline]

Buna-n is nitrile. The polyurethane o-rings are supposedly more extrusion resistant and therefore better for the HP piston-stem application. When Awap and I ordered these urethane 90 duro o-rings, I think we got some of a bad batch, as some of them worked fine and others just crumbled when squeezed.

I am planning another order of 90 duro urethane o-rings for my MK5/10 pistons.