CO2 Cylinder Thread

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PeeBee
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CO2 Cylinder Thread

Post by PeeBee » Wed Apr 18, 2018 10:25 am

It's a nightmare trying to get the right thread for these cylinders. I suppose with just cause, mucking about with connectors to hold back 850-900PSI could be hazardous. Anyway, it's not hard to find the thread is designated 'DIN477 / JIS m22-14 / BS 341 No. 8 / W21.8-14 / .860" x 1/14' which is a bit of a mouthful and not a lot of help.

I'd a couple of small cylinders that I wanted to use as "receivers", or reservoirs of CO2 when the cylinder is shut off (I wont try and explain why I'm doing that here) so these repurposed cylinders and connectors will only see about 60PSI.

So starting with that designation I took M22 and tried that. The diameter is right, but there's about 2 more teeth-per-inch on M22 so it binds after screwing on about two threads. Next, I'd read the thread is G5/8 (BSP): No it's not! However the threads-per-inch seems identical so you can screw 5/8" BSP, female, onto the male gas cylinder thread. It's a bit loose and 5-6 turns of PTFE tape was needed to get a seal (gas tape, its about x10 thicker than normal PTFE tape and should really only be used for one turn with 50% overlap). If you have a "DIN477 etc." female thread, for whatever reason, 5/8" BSP will not screw into it.

If anyone else comes up with advancements, go ahead! I'm waiting for some washers to turn up for the "crimp nut" on this 5/8" BSP hydraulic coupling I've got (not just the thread needs sealing, the "crimp" leaks too).
Cask-conditioned style ale out of a keg/Cornie (the "treatise"): https://drive.google.com/file/d/0BwzEv5 ... rDKRMjcO1g
Water report demystified (the "Defuddler"; removes the nonsense!): https://drive.google.com/drive/folders/ ... sp=sharing

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PeeBee
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Re: CO2 Cylinder Thread

Post by PeeBee » Wed Apr 18, 2018 2:57 pm

I think the "JIS M22-14" bit led me astray. M22 has a 1.5mm pitch (fine thread) which works out at over 16 teeth-per-inch (TPI; actually nearer 17) so "JIS M22-14" would be quite different from M22-1.5.

The key thread in that enormous designation seems to be "W21.8", whatever that is (Whitworth?), because you can get adapters to convert all sorts of threads (like BSPP or G5/8) to W21.8 "gas" thread (e.g. https://www.ebay.co.uk/itm/Aquarium-Tan ... 2303036329).
Last edited by PeeBee on Thu Apr 19, 2018 10:13 am, edited 1 time in total.
Cask-conditioned style ale out of a keg/Cornie (the "treatise"): https://drive.google.com/file/d/0BwzEv5 ... rDKRMjcO1g
Water report demystified (the "Defuddler"; removes the nonsense!): https://drive.google.com/drive/folders/ ... sp=sharing

Fil
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Re: CO2 Cylinder Thread

Post by Fil » Wed Apr 18, 2018 10:38 pm

Until a year or so ago there was a useful web site hosted by the paintball group 'TeamOnslaught' requiering only typing "team onslaught co2 info" into google to take you to a complete list of all international standard co2 valve/thread/bottle specs and how to mate em all topgether for the purpose of exchanging co2 into different vessels for paintballing, which covers more info than any brewer need know with his/her co2 bottle and reg..

Unfortunatly the site is no more and team onslaught have moved their online presence onto facebook!! If any of the info is still there?? saved somewhere on facebook i dont know, perhaps someone with a facebook account could have a looksee??

I wish i had cached the pages before they went PHUT!!


If they are still available those pages or their info would be worth stickying in here for prosperity..
ist update for months n months..
Fermnting: not a lot..
Conditioning: nowt
Maturing: Challenger smash, and a kit lager
Drinking: dry one minikeg left in the store
Coming Soon Lots planned for the near future nowt for the immediate :(

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PeeBee
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Re: CO2 Cylinder Thread

Post by PeeBee » Thu Apr 19, 2018 10:08 am

Fil wrote:
Wed Apr 18, 2018 10:38 pm
Until a year or so ago there was a useful web site hosted by the paintball group 'TeamOnslaught' ...
Thanks Fil.

Some more of what I gleaned. The long list of threads in the designation is a list of compatible threads. It's a wonderful bit of modern English in that it mixes metric measurements (e.g. 21.8mm) with imperial (e.g. 14 threads-per-inch). So it's...

Whitworth thread form (55 degrees, rounded crests).
0.86" British Standard Whitworth, right-hand (normal) (about 21.8mm OD).
14 threads-per-inch (or 1/14" pitch).
Flat seal with gasket. Male (external) thread on cylinder. (From BS341 No.8 ).

There doesn't appear to be a direct "standard" thread replacement. 5/8" BSPP (G5/8) female will screw onto the male (cylinder) thread loosely, but I woundn't like to use it with full cylinder pressure.
Cask-conditioned style ale out of a keg/Cornie (the "treatise"): https://drive.google.com/file/d/0BwzEv5 ... rDKRMjcO1g
Water report demystified (the "Defuddler"; removes the nonsense!): https://drive.google.com/drive/folders/ ... sp=sharing

f00b4r
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CO2 Cylinder Thread

Post by f00b4r » Thu Apr 19, 2018 2:46 pm

Fil wrote:Until a year or so ago there was a useful web site hosted by the paintball group 'TeamOnslaught' requiering only typing "team onslaught co2 info" into google to take you to a complete list of all international standard co2 valve/thread/bottle specs and how to mate em all topgether for the purpose of exchanging co2 into different vessels for paintballing, which covers more info than any brewer need know with his/her co2 bottle and reg..

Unfortunatly the site is no more and team onslaught have moved their online presence onto facebook!! If any of the info is still there?? saved somewhere on facebook i dont know, perhaps someone with a facebook account could have a looksee??

I wish i had cached the pages before they went PHUT!!


If they are still available those pages or their info would be worth stickying in here for prosperity..
If only we had a time machine......

https://web.archive.org/web/20160307225 ... 2_info.htm

EDIT: also a good example why you should think before you post on the internet as it never really goes away, even when deleted.

Fil
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Location: Cowley, Oxford

Re: CO2 Cylinder Thread

Post by Fil » Thu Apr 19, 2018 4:54 pm

Cheers @Foob4r i will now make my own archive.. with the advent of ww3 everything has been waiting to become a chargeable service.. and i think the world is almost web dependent enough for that to start kicking in soon too.

@Peebee check it out ;)
ist update for months n months..
Fermnting: not a lot..
Conditioning: nowt
Maturing: Challenger smash, and a kit lager
Drinking: dry one minikeg left in the store
Coming Soon Lots planned for the near future nowt for the immediate :(

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PeeBee
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Posts: 1575
Joined: Thu Jan 21, 2016 2:50 pm
Location: North Wales

Re: CO2 Cylinder Thread

Post by PeeBee » Fri Apr 20, 2018 8:30 am

Fil wrote:
Thu Apr 19, 2018 4:54 pm
... @Peebee check it out ;)
I did! There was nothing wrong with what I deducted (above) but the Team Onslaught stuff does cover some alternative "historic" and international arrangements.

One interesting bit I dug up was from BS341. Summarised here: http://www.ftipv.com/bs341-british-stan ... onnectors/. 5/8"BSP turns up here as BS341 No6 (rather than No8) together with what I think is the dreaded left-handed "POL" connector (BS341 No4?).

I shall continue with my 5/8"BSP cludge 'cos I'm only holding back 60PSI (not 60BAR cylinder pressure). But all this new information is making me feel confident about refilling the small cylinders I've got rather than "repurposing" them as a "buffer" CO2 reservoir.
Cask-conditioned style ale out of a keg/Cornie (the "treatise"): https://drive.google.com/file/d/0BwzEv5 ... rDKRMjcO1g
Water report demystified (the "Defuddler"; removes the nonsense!): https://drive.google.com/drive/folders/ ... sp=sharing

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