mixed threads...

While all of the threaded parts on the P08 were cut to the English Whitworth standard, several threaded parts on the accessories were made to some other standard. On some blueprints certain screws are labled Gew 4mm and a symbol for diameter. Gew, I assume, stands for "gewinde" which means thread.


I am actually quite surprised by the mixing of thread types and I assume that it was due to war time pressures (WWI).


I am unable to find any reference to the pitch of those metric threads, does anyone know the standards used, or know the likely pitch of metric fasteners in the early 1900's...


Thanks FGR