[modeleng] Re: 12ba Screws

Barrie Hi,
The size i have for 12BA across flats is 0.090" the nearest spanner size is 
3/32" which is 2.37mm

I was also reading about BA threads and the British standard goes down to 25 
BA..

I know that Tracy Tools list in their catalogue 18BA but what kind of spanner 
would you use for that.

In an old Machinery's hand book(13 Edition)that  i have it says that BA was 
based on a Swiss and Thury thread.

Iam just waffling on, info just for referance.

yours John Burridge




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