What is the barrel treat(Hopkis Allen spur trigger revolver No.5,38CF) prod.year 1882

Hi Guys,

after years I decided to assembly together parts from Hopkis Allen spur trigger revolver.
The problem is that the barrel I cannot screwed together with the frame, why?
Year ago we have moved to another house and all parts from this old revolver were stored in a metal can.
And its a reason why its not possible to assemble together, (the barrel treat is damaged because of free storage in this metal can) and during the move moved also the parts in the metal can...
So I would like to know what is the thread, if UNEF or other???
(It seem very fine)
Or let me know where I can ask?
Im very sad because of this......

Thank you Guys for any advice....

I think “treat” means “thread”.

Picture of the damage would help. Might be salvageable by judicious use of Swiss files.

threads also vary depending on model + caliber -

And until WW1 there was no standardization. Every factory made its' own threading tools according to the whims of the plant superintendent.

Yes, its a Thread.....
Here is a link:
https://www.gunsinternational.com/gu...n_id=101813675

I ask in one work shop and they told me its very strange thread, it seem like armor thread.

Re-read Post #5. Not likely you will find taps and dies for that thread form today. Can you post a closeup photo of the damage?

the damage is made from another metal parts, (in a metal can) normally hurt - like from a hammer at more places, I tried this question to pin on to another forum (thefirearmsforum.com) but there i have ban (so it isnt possible).I tried also wrote to C R store (historic firearms) and I see if they help.
Best way to buy a Treaded round jaw but is a question which kind of thread and also where???
Possibly try to do it also by a metal fine file, but the thread is very fine and the result can be unsure/doubtful.....

Hi,

to try to find which thread is used in a swiss files???

Dont understand, what did you mean?

Cheers Mira

Also called needle files, or jewelers' files. Look on Amazon. You do not want the "diamond" kind.

Buy this set. Scroll down to see the shapes. You will use the lancet, knife, and triangular to reshape your damaged threads,

https://www.amazon.com/Hardened-Stre...2C2064&sr=8-28

its not so easy, if really armor thread the repair isnt poss. by files....
If metric thread, yes its possible, but thanks.
Anyway I learned in ZB CZ, gunsmith/fine locksmith, have 45 years old, i have any possibilities but with this thread im clueless....
Thread is not standadized....

What is "armor" thread? Hardened? Shape of the thread maybe?

I'm imagining that by armor you mean that the steel has a hard skin and a softer core. We here call that "case hardened". Am I close?

Mira iirc the XL models were made in 3 frames sizes + many different calibers, so i do not think they would be all the same threads -

I have rehabilitated some very fine threads that haven't been hardened by using a razor blade to chase the threads. If the threads aren't too mashed up and you have a LOT of patience it can be done. You'll go through a number of blades as you try and move the threads back in to shape by moving the blade side to side and I suggest you pick up some +2.5 or +3.0 reading glasses so see what you are doing. It's also best to have a very well lit area to work in.

It might not get the threads to be "perfect" again but I've found it is possible to at least get them functional. Once you get them to that point use some oil and gently try threading the barrel back in to the frame. It will take a lot of working in and out and further correction of threads.

LOTS of patience.

Hope that helps,

-Ron

You can also make a cheap thread file by grinding a hard hacksaw blade to a 60deg knife edge .....enough cutting teeth remain to chase threads

https://en.wikipedia.org/wiki/Screw_thread

its a armor thread.....

https://en.wikipedia.org/wiki/Screw_thread

and its a armor thread.....:-) (see its not international name for this thread), practicaly its a special pipe thread, look at wikipedie.

Quote:

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Originally Posted by mira

https://en.wikipedia.org/wiki/Screw_thread

its a armor thread.....

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In glancing over your link I am not seeing what an "armor thread" is?

We are unable to help until we find out what this "armor" thread is. No one here recognizes the word in the context of machine threads.

Hopkins & Allen was an American company. They most certainly would not have used a foreign (i.e. European) thread.

A photo of this would clear up a lot. Or a hand drawing.

If you are Czech, perhaps you know the German word for this?