N Cook wrote:

For period 1970 to 2000, whatever they are, they are not very common in
Europe. Coarser thread , diam for diam, than the usual European mm and BA.
Common sizes are about 0.132 in outside diam. , pitch 32 TPI, would they be
UNC 6 ?
and 0.11 inch od and TPI about 40 , would they be 4 UNC ?


You need to try to find a copy of this handy little book:

http://www.sequoiapublishing.com/pdt_pocketref3ed.htm

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida