> On 17 Feb 2018, at 15:26, Peter Blodow <[email protected]> wrote:
> 
> 
>> Am 16.02.2018 um 06:32 schrieb Chris Albert
>> 
>> I think this thread size os used for those very thin rings used for
>> electrical  jacks and toggle switches.  The ring nuts are only 2mm thick so
>> they need an ultra fine pitch.
> ...which usually is 0.75

Another way is to use a very large thread angle. 
This one is metric on diameter, 80 degree thread angle and TPI pitch. 

https://en.m.wikipedia.org/wiki/Panzergewinde


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