> These latter sets are/were called "serial hand taps". No idea if they're
> at all common these days.
I've seen exactly one of those sets in my life, my grandfather got them from
his father. I believe they were made around 1915. Fitted wooden box
(cracked in several places), adjustable square dies, and only about 5 sizes
in the whole set.
You can still buy sets with all 3 types of tap, but AFAIK all modern taper
taps cut full depth threads. (Unless of course you buy custom taps that
deliberately cut undersize threads.)
Randall
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