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Old 12-21-2006, 02:51 PM   #1 (permalink)
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Question about (certain) threading and adaptors

Ok experts, I need to know what exactly two threads are. First, ASA threads. Second, bottle threads.

The other thing I want to know is if anyone knows of an adaptor off hand which takes the female bottle threads and has the male asa threads. I'm sure theres at least a couple out there but I need to know the threads first in order to find it.

thanks!

III

*EDIT: If anyone has a die for bottle threads, I would like to borrow it from you.
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Old 12-21-2006, 03:37 PM   #2 (permalink)
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All the info you need: http://haveblue.org/tech/asa/index.html

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Old 12-21-2006, 03:38 PM   #3 (permalink)
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I assume the difference is one has something to depress the tank pin and the other doesn't?

There's the palmer "tank extender":

https://www.palmer-pursuit.com/ecom/...a8c93d3d4d6a05

Alternatively, if you need black and don't mind two parts (seems excessive, but an option):
+
https://www.palmer-pursuit.com/ecom/...a8c93d3d4d6a05
https://www.palmer-pursuit.com/ecom/...a8c93d3d4d6a05
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Old 12-21-2006, 03:44 PM   #4 (permalink)
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dark- thanks. ASA threads are CGA320.

fred- almost...

What I mean by "bottle threads" are the threads IN an actual co2 canister.

III

*EDIT: Left side = asa threads; Right side = bottle threads
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Next time add more yelling and crazy camera angles. Maybe start an episode with you parachuting into your attic, then you immediatley come under fire from the french resistance. I can see it now....
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Last edited by SuperHiQuality87; 12-21-2006 at 03:52 PM.
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Old 12-22-2006, 02:03 AM   #5 (permalink)
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Oh... Nope. Probably not.

Shouldn't be too hard to make, though, with the proper material and a lathe.
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Old 12-22-2006, 05:29 AM   #6 (permalink)
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What do you need that for?

Just curious. Seems like only a weird double valve could come out of it.
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Old 12-22-2006, 09:00 PM   #7 (permalink)
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Cunha-

This is what i need to do.

1st pic: A cooper-t air system goober that I picked up on ebay a while ago with damaged threads.

2nd pic: What I need to do. That is the forward asa on a vm68. In the picture, it is just sitting in there. I need to be able to thread the air goober into the front of the vm.




cheers;
III
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Old 12-22-2006, 11:23 PM   #8 (permalink)
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Those threads are messed up enough that I would not trust them with 800'ish psi on them anymore. Running a die over them will remove metal where it was pushed out of place. THis will still leave the damaged area even less able to hold up against the load. 850 psi is not a pressure to be taken lightly and you've only got 4 to maybe 5 good threads still holding the connection together. That's not a lot of safety in my books.

I'd suggest that unless you can find some way to replace that end spool that runs through the block that you're better off just chalking this one up to experience and forget about it.
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Old 12-22-2006, 11:29 PM   #9 (permalink)
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You're probably right. Even with teflon tape and/or loctite? Yeah, or course...

Well shoot. I really needed to be able to use it. And I KNOW it's going to be impossible to replace. They're no longer on Cooper-T's site.

III
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Old 12-23-2006, 12:21 AM   #10 (permalink)
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I know it sucks. All the teflon tape or loctite in the world won't make up for the lost metal that needs to be there to take the loads.

At 850 psi if that thread is 5/8 in diameter then there's 260 lbs of pressure pushing against those 4 to 5 undamaged threads that are actually being used. Chances are that it would hold but it's an iffy sort of deal I'd say. Certainly not the 2 to 3 times safety margin that it should be. And any further thread damage from flexing or other impact damage not to mention the chances of further cross threading it and there goes even the minimal safety margin that it may have.

For example I know that all the books call for minimal thread engagement to reach full tensile bolt strength is 1.5x the diameter of the bolt. WIth those 4 or 5 good threads you don't even have 0.5 of the diameter engagement.

What's in that pin or spool that fits in the block? I see what could be a valve pin sticking out so it's obviously not just a gas conduit.
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