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Guys,
i am looking for the thread form for the No32 scope windage and elevation screws,
the DIA is 0.187 x 32 threads per inch but 3/16 bsf,2BA will not fit any help please guys or drawing would be great as the originals have been lost from the UK pattern room and the Royal armory
thanks in advance
Could they be 10-32 UNF?
BSF threadform is 55 degree angle, BA is 47.5 degrees, and UNF is 60 degrees, which is probably where the issue is.
Can you get a thread gauge on it to check (accepting that it is probably too small to accurately see what angle it is).
It is a double start thread. ie) there are 2 threads located 180* apart on the threaded shaft.Quote:
Originally Posted by aussiesuperdad
The man's right. I believe it's 3/16" x 16 TPI but as it's a twin start thread it's effectively 32 TPI.
There is a dimensioned drawing in a certain little red book on the No.32 scope IIRC. ;)