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Help ID fuse in Russian 122mm HE shell

F

FCSA-UK

Member
Hi,

Looking to restore a relic condition 122mm Russian HE shell, the fuse is in a bad way so thinking of just replacing with something less corroded.

Does anyone know the fuse type that I should be looking for? (I have a V-429 and the fuse in the photos below is shorter than the V-429). The top section as seen removed below is 14.24mm tall - excluding top and bottom threads.

Many thanks



20250916_172747_resized.jpg
 

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FCSA-UK said:
Hi,

Looking to restore a relic condition 122mm Russian HE shell, the fuse is in a bad way so thinking of just replacing with something less corroded.

Does anyone know the fuse type that I should be looking for? (I have a V-429 and the fuse in the photos below is shorter than the V-429). The top section as seen removed below is 14.24mm tall - excluding top and bottom threads.

Many thanks



View attachment 206181
Click to expand...
Hi FSCA-UK
Can you provide a photo of the entire projectile with the adapter screwed on and if possible, maybe measure the height of the entire projectile and the height of the separate adapter for the fuse?
I would appreciate that :)
Or who would like to join in?
Akon
 
Hi FCSA-UK,
As Akon says, looks like the upper part of the KTM-1,
LEAFLET
 

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It is a KTM-2 and the shell is most likely a 122mm D-462 (53-Д-462) smoke shell. It must have a long burster tube screwed into the fuze well.
1758198444483.png

Regards,
Vince
 
We have a sample - original photo - I would say that it does not fit..when I compare it with the OF-462A version or the D-462 version.Namely, the D-462 version has an internal case for the charge and it would be visible and it is not there.The OF-462A version - here it contradicts the height of the case ...(estimate) until we have a photo and measurements..
That ammo sample case is definitely inferior.
Interesting Russian sources state that until 1935 there was also a version of the ОФ-462Л (OF-462L) available, about which I know absolutely nothing...By the way, the sources state that the previously produced O-462А shell was later re-designated OF-462A.
1758207262457.png1758207307402.png1758207446298.png
I'm waiting for colleague to measure it and take a picture - for now I'm just guessing..
Akon
 
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LEAFLET said:
Hi FCSA-UK,
As Akon says, looks like the upper part of the KTM-1,
LEAFLET
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Hi LEAFLET
The fuse body on the FCSA-UK sample is one-piece, you provide a photo and a cross-section of the KTM-1, it is definitely two-piece (fuse body). I think it is not identical :) Let's look ...
Akon
 
strakv said:
It is a KTM-2 and the shell is most likely a 122mm D-462 (53-Д-462) smoke shell. It must have a long burster tube screwed into the fuze well.
View attachment 206210

Regards,
Vince
Click to expand...
Hi Vince
The fuse body on the FCSA-UK sample is one-piece, you provide a photo and a cross-section of the KTM-2, it is definitely two-piece (fuse body). I think it is not identical :) Let's look ...+
Akon
 
AKON_ said:
Hi Vince
The fuse body on the FCSA-UK sample is one-piece, you provide a photo and a cross-section of the KTM-2, it is definitely two-piece (fuse body). I think it is not identical :) Let's look ...+
Akon
Click to expand...
I got confused thinking the disassembled upper part of the fuze being the whole fuze. The portion of the upper thread is similar to the KTM-2’s thread. So i might have been wrong stating it is KTM-2, but
it’s still one KTM version, the only difference between them is the thread diameter.
 
1758218757610.png
One of the lesser known and non-series produced versions of the KTM fuse is the KTM-14 (developed in 1942)
Akon
 
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Right, first of all we are looking at a two-part (three if we include the booster housing) KTM-series fuze, which is attached to the nose fuze well of a projectile. The two visible components in nose area of the projectile are the two parts of the fuze. They are not the fuze and the fuze adapter. A fuze adapter may be present, but this is not visible in the imagery posted by FCSA-UK so far (as of 22:05'ish on the 18th of September 2025). Two comparison images using the KTM-1 fuze as an example are below.

1a.png

2.png

If the projectile is 122 mm, the KTM-series fuze normally used is the KTM-2, and this is used with the 122 mm 53-D-462 smoke projectile. The KTM-2 has an externally-threaded lower area, which uses ‘SP 26.56×16 TPI’ threading. Diagrams of the KTM-2 below.

KTM-2.png

Official Russian reference materials also states the KTM-1 was temporally used on high explosive fragmentation projectiles fired from the 122 mm 1910/30 howitzer during the World War Two. To use the KTM-1, or the KTMZ-1, this would require a projectile with a fuze well with M36×2.5 (more correctly SP 36.14×10 TPI) internal threading. This is the same thread type as the RGM, D-1, V-429, etc., series of fuzes. As such the same nose well thread type as most Russian 122 mm high explosive fragmentation projectiles.

Ultimately once the lower part of the fuze is removed and its threads shown, along with a photo of the complete projectile, we will be able to say with more accuracy what fuze it is, and what projectile it is screwed into.

For further reference diagrams of the the KTMZ-1 and KTM-3 fuzes are below.

KTMZ-1.png
KTM-3.png
 
Hi Eggburt 1969
Look carefully at this picture again.The fuse - i.e. its body is one piece so ....there are logical conclusions from that.
So:
For your version that you offered, there are two logical reasons why it is only the front part of two parts (i.e. three)
Because the diameter of the thread D1on the hood is roughly the same) as on the part below D2.
If it were a part with an M 36 thread, it would have a rapidly larger diameter, and it definitely does not.
If it were a variant of one part of the body, the lower part would have a significant chamfer and it does not.
etc.
For these reasons, it is the original version.
Not the KTM -14 version.
It was a nice exercise, wasn't it? :)
Akon
1758237514565.png
 
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I'm sorry AKON, I really don't know what on earth you are on about?

Firstly I've never said anything about KTM-14 fuze?

Secondly, as I have already stated, the thing shown unscrewed in the photo is the front part of a two-part bodied KTM-series fuze. A simple look at what is inside this part shows it to be the front part of the fuze (ignoring the missing protective nose cap and booster assembly). What is seen inside the front part of the fuze, well the central firing pin of the striker assembly, the anti-creep ring that has four equipositioned inwards-facing tabs, and the retaining ring for the anti-creep ring. These components are not in the rear part of two-part bodied KTM-series fuzes.

Thirdly, the thing after the first part of the fuze, which was not removed in the original photography, is the rear part of a two-part bodied KTM-series fuze.

As to what the second part of the two-part bodied KTM-series is screwed into? As previously stated "Ultimately once the lower part of the fuze is removed and its threads shown, along with a photo of the complete projectile, we will be able to say with more accuracy what fuze it is, and what projectile it is screwed into.".

An updated composite image, which hopefully illustrates my previous comments, is below. If this isn't enough, I give up, as I have work to do.

2.png
 
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Eggburth is correct. It is the top part of a KTM-X fuze.
I would also like to see the rest of the projectile.
There is no mention of KTM-1 fuze on a regular HE projectile in the manuals I have.
Unless we see the rest of the projectile or the bottom half of the fuze it is impossible to say what is really going on.
Bob
 
Nabob said:
There is no mention of KTM-1 fuze on a regular HE projectile in the manuals I have.

Bob
Click to expand...

Hi Bob,

The statement about the temporary use of the KTM-1 fuze with high explosive projectiles of the Model 1910/30 122 mm howitzer is in a Soviet-era manual from 1946. Its title being 'Взрыватели КТМ-1, КТМЗ-1, КТМ-2 и КТМ-3 - Описание'.

The manual covers the KTM-1, KTMZ-1, KTM-2, and KTM-3 fuzes. The cover of which posted by AKON earlier.

The text (sentence) in question is below.

"В период Великой Отечественной войны взрьгватель КТМ-1 временно был допущен для комплектации осколочных гранат 122-мм гаубицы обр. 1910/30 г."

Machine translation with corrections to English/British terminology

"During the Great Patriotic War, the KTM-1 fuze was temporarily approved for use with fragmentation projectiles of the 122-mm howitzer model 1910/30."

I've not checked every other publication I have, but I don't really have all that many on the Model 1910/30 122 mm howitzer anyway.

Yours,

Neil
 
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