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 ?

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