- Current issue of Home Shop Machinist has an extensive Hardinge list of
collets and basic sizing.
Not enough info to make a closer from, but enough for identification.
There is also a list of machines and the applicable collets (in Hardinge's
opinion, that is. Others may have been used, like a 3C instead of a 3AT for
a 1 1/2-8 machine like Logan or A-C ).