Threads on Torches, etc. Rh/RH or RH/LH

[Amir Avitzur]

Anybody know what kind of threading the Smith AW1A torch has?

All I could find was  5/16" x 27tpi ... but not whether both intakes are RH threaded or one is RH and the other has LH threads..

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Amir Avitzur
R"G Israel

[Doug Fattic]

Amir,

 

In the States there is essentially 2 sizes of threads for the all the fittings from the regulators to the torch handle.  Size “A” is 3/8” X 24 UNF and size “B” is 9/16” X 18 UNF.  There are others but those are the 2 probable threads used on regulators and hoses and whatnot for what framebuilders use in the US.  Other countries use different threads. 

 

The hose threads into the Smith AW1A torch handle are size A.  The threads on the tip on the end of the AT-61 mixer/elbow (on the other end of a AW1A) are 5/16” X 27 tpi. 

 

So the question to you is are you trying to make something fit between the torch handle and the regulator(s) or something on the end of the AT-61? 

 

Doug Fattic

Niles, MIchigan

[Jim Adney]

On 17 Jul 2018 at 15:24, Amir Avitzur wrote:

> Anybody know what kind of threading the Smith AW1A torch has?
>
> All I could find was 5/16" x 27tpi ... but not whether both intakes are
> RH threaded or one is RH and the other has LH threads..

Aren't fuel threads always LH?

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*******************************
Jim Adney, jad...@vwtype3.org
Madison, Wisconsin, USA
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[walawalaoxenfree]

Peter

I'm hoping to buy over the web and have it shipped to my mother ... for pickup on my next visit.

I've seen all sorts of combinations on flea market equipment (including Male/Female, RH/LH, thread size) which I want to avoid when ordering over the web.

.What's strange, is that the welding industry avoids providing basic data and drawings. So mixing and matching is very risky.

Amir

[M-gineering]

On 7/17/2018 3:56 PM, Jim Adney wrote:
> On 17 Jul 2018 at 15:24, Amir Avitzur wrote:
>
>> Anybody know what kind of threading the Smith AW1A torch has?
>>
>> All I could find was 5/16" x 27tpi ... but not whether both intakes are
>> RH threaded or one is RH and the other has LH threads..
>
> Aren't fuel threads always LH?
>

I can swap fuel and oxy on my torch (but I bought it s/h ~40 years ago ;))
--
mvg

Marten Gerritsen
Kiel Windeweer
Netherlands

[Doug Fattic]

Amir, In Chapter 3 Section 6 titled “Brazing Equipment” on page 78 of your awesome frame building class manual is a list of part numbers from TM Technologies for all the equipment you need from regulators to the flashback arrestors to the check values that attach to your torch handle.  Later in that list are also their part numbers for the Meco multi-port tips.  They aren’t a discount supplier but they have all the right stuff starting with their lightweight hoses for us in one convenient location.  I don’t mind paying standard prices from them.  It is common that the cheapest web prices are not places that inventory stock themselves but rather have it dropped shipped from Victor or whoever.  In your case that wouldn’t matter but it can be irritating for someone not wanting to wait a couple of weeks for their order.  

On page 75 of my manual  is also the Western Enterprises part numbers for American brass fittings if you are cutting off the end of a foreign (to us Americans) hose to convert one end to either a size A or B fittings.  Western Enterprises is your source for all kinds of welding (and other) equipment fittings.  They have drawings and pictures too.  Well you can't buy direct from them but they are the source welding supply places use to get their fittings.  If you give them the WE # they will know what you want.  

Just so you know, oxygen fittings are standard right hand threads and fuel fittings have a hatch mark in the middle of a nut to indicate they are left hand threads.