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Help with Propane torch please

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John Horne 215/06/2017 21:02:38
39 forum posts
7 photos

Hi everyone, I've been trying for a while to get some info on propane torches, I've sent out over a dozen emails to various companies and had only 2 replies, neither of which helped.

Here's my problem, I have a Mapp gas torch which has been fine for most jobs, even small silver soldering work, but its lacking heat for anything larger scale. I also have 2 propane torches, one is an old E3 Sievert, the other is an old Calor torch, similar to the older bullfinch with the red handle (but different burner fitting). I want to be able to use one of the torches with a range of burners.

Any idea if the new Sievert burners will fit the old E3 style torch ?


Can you still get burners for the Calor torch, one small one would do as I have large burners.

No answer from either Sievert or Calor, I guess its not worth their time.

Any help much appreciated.

CuP Alloys 116/06/2017 07:54:18
238 forum posts

Hello John,

Sievert have made some changes over the years but, as far as I understand, they have not related to the burner thread. The modifications have been at the other end of the torch.

For details of sievert burners visit **LINK**

They are normally available ex-stock


John Horne 216/06/2017 09:19:42
39 forum posts
7 photos

Thanks Keith, what was puzzling me is their all advertised as fitting the "pro" neck which looks very different from mine. When you look at the burner diameters and screw fittings there are obviously 2 sizes yet no one explains the difference. I'm going to call in at a plumbing supplier who has been in business a long time, I'll take the Sievert burner and see what they say.

May as well give up on the Calor torch which is a pity, its nicely made and works very well, but I cant get a small burner for it and I dont want to keep changing torches to do different jobs.

I'll let you know how I get on.

martin perman16/06/2017 10:24:10
1828 forum posts
78 photos

I have an old Sievert torch and have no problems fitting new nozzles.

Martin P

mechman4816/06/2017 11:04:55
2664 forum posts
410 photos

...May as well give up on the Calor torch which is a pity, its nicely made and works very well, but I cant get a small burner for it and I don't want to keep changing torches to do different jobs...

​Do you have the expertise to make your own small burner taking into account you having the correct size drills for the jet size ?


ega16/06/2017 11:20:17
1714 forum posts
150 photos

John Horne 2:

I have a Calor Professional torch bought many years ago. At some stage I acquired a (?) American standard burner and made an adapter to use it with the Calor handle; could you solve your problem in the same way?

I have had a quick look at my torch and am slightly puzzled by the burner thread which seems to be rather more than 1/2" on major diameter and of 26 TPI. The *inlet* threads on these torches are BSP but the burner thread seems different. I say puzzled because I must have known what it was to make the adapter.

John Horne 216/06/2017 11:24:18
39 forum posts
7 photos

Hi George, I could make a new jet for the Sievert but what I really need is one torch with a range of burners, I just rang Sievert and they dont know ! they reckon the thread size is 3/8 on the new torches but thats for the short neck piece to fit onto, not the actual burner thread. You would think it would be a simple enough question, apparently not.

Hi Martin, could you do me a favour ? could you measure across the actual thread which is part of the burner ? not the neck fitting,mine looks to be 3/4" or 14mm.

Oldiron16/06/2017 13:52:46
442 forum posts
22 photos

John Horne 2 I have a couple of Siievert burner heads I don't use. A new 3938 small and a used large 3944. Both old style and still in the original red boxes. Sorry no torch to fit them to. Message me if you want them .


NIALL HORN16/06/2017 16:25:33
26 forum posts
4 photos

I have measured the burner (male) thread thread on my Sievert neck tube and it's definitely 26 tpi with a thread gauge but 0.784" OD which is too large for 3/4 BS Brass. It could be a special to make Sievert burner heads unique!!


Brian Sweeting16/06/2017 20:41:53
419 forum posts
1 photos

You can get a double nozzle Rothenberger 3.5012 burner which ups the heat output.

Quote from an advert...

Rothenberger 3.5012 ROFIRE Swivel PRO Double Barrel Brazing/Soldering Torch with 360° Swivel and High Heat Output As the Torch is double barrelled the following outputs are achieved - 2700 Degrees Centigrade with Mapp Gas and 1600 Degrees Centigrade with Propane. Torch will braze up to 1" and solder up to 64mm This item is a must for all AC and Heating/Plumbing Engineers, and a rare item. A truly superb item and Brand New with fast Dispatch ROFIRE Swivel PRO Double Barrel Torch with 360° Swivel and High Heat Output Get the job done quickly and easily with this torch. This makes soldering and Brazing more efficient by swivelling 360° and by having a very high heat output. A must have for any job. Features: • Head swivels 360 degrees • High heat output • Cyclone burner Established in 1949, Rothenberger has over 50 years of History as the market leader of innovative and technologically sophisticated pipe tools and machines. A long list of patents, Certification in ISO 9000, 9001 and 9002, and an emphasis in research and development result in continuous improvement and new developments in professional pipe tool technology.

No affiliation, just used them at work brazing refrigeration plant.

Edited By Brian Sweeting on 16/06/2017 20:43:31

JasonB16/06/2017 20:50:16
18134 forum posts
1996 photos
1 articles
Posted by NIALL HORN on 16/06/2017 16:25:33:

I have measured the burner (male) thread thread on my Sievert neck tube and it's definitely 26 tpi with a thread gauge but 0.784" OD which is too large for 3/4 BS Brass. It could be a special to make Sievert burner heads unique!!


I would have thought they used metric being European, something like M20x 1.0

John Horne 217/06/2017 15:12:32
39 forum posts
7 photos

Just an update on this, so far no help from Sievert even after calling them, their advice was to go along to a Sievert dealer and see if my burner matched up to the ones on sale now, seriously, I'm not kidding, this was from Sievert UK, they dont know if their burners will retro fit older models. Apart from that there is no dealer within 50 miles of me.

I also thought it would be metric threads since they come from Sweden but there not, I think Niall is right and its a manufacturers thread, it matches nothing I have either.

Anyhow, thanks to a very kind member on the forum my problem is now solved. Thanks to all who tried to help, I just wish Sievert had been as helpfull.

Maurice17/06/2017 15:25:35
464 forum posts
50 photos

If it is of any help, I recently acquired a set of old Sievert burners that screw perfectly onto my old Calor torch. My problem, the I have not properly looked into yet, is they need new sealing washers that are inside the threaded part of the torch.


John Horne 217/06/2017 16:18:01
39 forum posts
7 photos

Hi Maurice, that's really wierd, I have both an old Sievert and an old Calor, there's around 6mm difference across the threads. I wonder if your Sievert burners are the newer type. I've looked through all the sites that sell Sievert and cant say I've seen washers, you might have to get something close that will cut down to size, I'm thinking ballvalve washers from a plumbers merchant. I've also used old car inner tube for washers.

ega17/06/2017 16:44:31
1714 forum posts
150 photos


I have successfully used the graphite-coloured Hallite jointing for making these washers. I believe propane attacks some kinds of rubber.

John Horne 217/06/2017 18:16:44
39 forum posts
7 photos

Yes your right Maurice, it does attack some types of rubber as its a by-product of the petro chemical industry, anything you use would have to be resistant though it has nothing like the destructive powers of petrol. Anything used in the auto trade would be good or fibre washers perhaps. I remember using leather washers in old parrafin/petrol blowlamps and they lasted for years, the pump washers were always leather.

CuP Alloys 117/06/2017 18:39:08
238 forum posts

Hello John.

I trust your local plumbing merchant was helpful!

I am told by Sievert that the burner thread is M20 x 1.

It is not a unique thread.



John Horne 217/06/2017 19:09:02
39 forum posts
7 photos

Hi Keith and thank you, that would make sense, I dont understand why Sievert UK couldn't just tell me that in the first place, what confused me more was the girl I spoke to at Sievert started talking about a 3/8 BSP fitting which I now think is an adapter but never mentioned M20 as the burner thread. My 1.0 metric thread gauge isn't a good fit but that must be down to wear.

the artfull-codger17/06/2017 19:38:07
251 forum posts

Just measured both my sievert burner threads & both 20mm dia & 1mm pitch I was fortunate a lot of years ago when I bought mine that a local engineering supplies shop [stevensons in darlington] had the nozzles in for four and six each [22.5p] wrongly priced so I bought a full set & they've served me well for 40 odd yrs,but I bought a flamefast hearth & it's far superior to the sievert, & over the years I "dropped across" various smaller air/gas guns as well, & they only use about 2-3psi gas,incidently flamefast wanted about £30 to convert each of my guns from natural gas to propane [which I definitely wasn't going to pay} but they work ok on propane and butane without conversion but they are quite sensitive to adjust but I can live with that, they come up on ebay sometimes & are well worth having.

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