Coleman burner thread type.

Can anyone tell me the exact thread type, size and pitch that will fit the top of the Coleman burner shown above?

Thanks.

 

Try 1/4-20 UNC and #10-32.

 

I used #10-32 UNF here:

Fettling a beaten up Canadian Coleman 159X Table Lamp.

Tony

 

Closer to home 3/16 - 32 BSF as Henry told me Coleman 158 1947

 

I know that threads can be very close… but why would an American lamp use BSF?

Tony

 

No Idea - this is a helpful comparison tho - pitch is the same but thread angle 5 degrees different: What is the difference between BSF/BSW and UNF/UNC? |

 

3/16" is pretty close to the diametre of #10, which is 0.1875"(3/16") vs 0.19"(#10). Makes no difference actually.
The only thing would be the thread angle of 55° for BSF against 60° for UNF.
If that's mine, I'd use exactly the thread type/size and pitch whenever possible.
Unified Thread shouldn't be that difficult to find in the UK, I suppose?
Its less common as compared to BS or the metric in my location but its still available.

 

I just worked with what Henry said - and it was sound advice...

It may be that it should be UNF but the BSF worked for me.

 

Take a look here

Vent/shade stud removal from burner assembly? - The Coleman Collectors Forum

 

Well Colin. You have started a good conversation. Related to this is your thread on the Coleman NRV removal tool. Which ended in agreement that the BSF works but a UNF would be better. It would make sense for Coleman to have used the same thread as alread in use. The balance of probabilities is that the UNF is probably the authentic thread.
Given your collection of taps/dies do you have a no10 UNF die ?

 

Since the diametres are approximately the same but with different thread angles of 60° and 55° respectively, there might be two different scenarios:-

1. A bolt or stud(outside thread) with a #10-32tpi UNF to fit into a nut/hole(inside thread) with a 3/16"-32tpi BSF.

2. A bolt/stud threaded with a 3/16"-32tpi BSF to fit into a nut/hole that's threaded with a #10-32 UNF.

Assuming we were to make use of the most common tolerance fits(class 2 or medium) available for the respective taps and dies, which scenario do you guys think would give a snug, better or tighter fit?

 

I've got both #10-32 and 3/16 BSF taps and dies so I'll probably go with the UNF as its a Coleman.

 

I can tell you for certain the original thread in your mixing chamber was 10-32... They are often stripped and tapped larger.

 

That migh be what has happened here!