Bottle threads question

[SilentSquirrel]

I have a new (to me) 45 Minute Bottle
It has female threads in the neck
What are the thread specifications for connection of a fill valve,please?
Is it DIN or M18x1.5,or?

Thanks
Edward

 

[Scotty1]

U.S. made bottles are 7/8-14 threads. Import bottles are typically M 18

 

[starlingassn]

would this work for you?

 

[SilentSquirrel]

would this work for you?

View attachment 379772

Do not know if it will work for me @starlingassn
What are the threads, please
And will it handle 4500psi?

My bottle is US made
Using my $17.99 Amazon digital calipers the inside dia of the threads measure19.6mm/0,771"

 

[starlingassn]

do not know the threads,
but it came off an msa 4500psi scba bottle,

shoot me a pm if you want it

 

[Geezerhood]

I have a new (to me) 45 Minute Bottle
It has female threads in the neck
What are the thread specifications for connection of a fill valve,please?
Is it DIN or M18x1.5,or?

Thanks
Edward

So far every SCBA tank I have seen has the same threads between the valve and the tank, and of course the same threads on the outlet side of the valve since they are (almost?) all CGA347.

If your tank already has an SCBA valve on it, then all you need is a CGA347 fill station.

 

[Trucker3573]

I can’t remember but will try to look it up. If it’s an American made bottle it isn’t m18 threads.

Edit: It’s most likely 7/8 x 14

 

[SilentSquirrel]

So far every SCBA tank I have seen has the same threads between the valve and the tank, and of course the same threads on the outlet side of the valve since they are (almost?) all CGA347.

If your tank already has an SCBA valve on it, then all you need is a CGA347 fill station.

View attachment 379833

There is nothing installed in the neck of the bottle.
Simply bare female threads
The id of the threads is 19.6mm/0.771" thread to thread

 

[Geezerhood]

There is nothing installed in the neck of the bottle.
Simply bare female threads
The id of the threads is 19.6mm/0.771" thread to thread

I have always used the SCBA valve assemblies, but I am 99 44/100's percent sure that the threads are 7/8-14UNF also designated as .875-14UNF.

Here is one thread on this "thread" topic on AGN

You can get an SCBA valve like the one starlingassasin posted for free sometimes at a fire station off an expired tank or buy a used one off ebay for $25+, then get the fill station like what I posted above, or go with one that goes directly into your bare tank like this one:

 

[SilentSquirrel]

I have always used the SCBA valve assemblies, but I am 99 44/100's percent sure that the threads are 7/8-14UNF also designated as .875-14UNF.

Here is one thread on this "thread" topic on AGN

You can get an SCBA valve like the one starlingassasin posted for free sometimes at a fire station off an expired tank or buy a used one off ebay for $25+, then get the fill station like what I posted above, or go with one that goes directly into your bare tank like this one:

View attachment 379883

Thanks for the link @Geezerhood
That answered the question and had other good info as well
Edward

 

[Scotty1]

Thanks for the link @Geezerhood
That answered the question and had other good info as well
Edward

Just be aware that most on Amazon are metric, and not compatible.

 

[Humdinger]

As @Scotty1 and @Geezerhood both said, your U.S. SCBA tank is 7/8-14 thread sometimes referred to as .875-14. You can find that valve on Ebay, or Aliexpress for significantly less than Amazon charges for it. Just be sure you get the right thread pitch. Don't get one with M18*1.5 metric thread or you'll be sending it back.