Min gas regulator

[parpot]

I am trying to find out what the thread size is on the gas outlet side of the reg, it’s a female threaded connection but can not work out what it is, looking for some help please

 

[peebee]

CO2? Sounds like it (female on regulator, male on cylinder). Full designation is "DIN 477 / JIS M22-14 / BS 341 No. 8 / W21.8-14 / .860" x 1/14" ... BS341 gives a description of various cylinder threads for different gases (No.8 is CO2). DIN477 does the same. The rest are compatible threads of which you often see "W21.8-14". They are weird sizes, W21.8-14 is typical, an imperial Whitworth thread-form, 21.8mm diameter, and 14 threads per inch. JIS M22-14 is ... you guessed it.

 

[parpot]

Thanks for the response but it’s a mini regulator and the nearest size I can guess is around M8 .075 pitch?