(Question) Thread size for FireFly body

[HgRyu]

Anyone can help me for the thread specification of the FireFly body ?

Threads ; pitch, number of threads, major and minor diameters of thread ?

 

[matrixshaman]

I'm seeing 18.38mm diameter of the copper threads that screw into the battery tube. And about 1.21mm from thread to thread. Thread depth looks about 0.67mm. That's about the best I can do with magnifier and cheap digital calipers. Hope that helps.

 

[HgRyu]

Thanks matrixshaman for your kindness,
I actually want to know the "standard" of screw(thread) for the cad drawing something like "3/4 16UNF". That is inch screw and we use metric here.
Small cnc shop here can't identify the thread.

 

[nekomane]

Hi HgRyu,

Thread pitch is 24 TPI.


Outer Diameter of the heatsink/can is 18.30mm.


Inner Diameter (though I am not confident this is the accurate way to measure) is 17.54mm.

Hope this helps.