Small Taper Thread Tap

whitmore said:
How old might the tap be? The old 'screw plate' tapping apparatus generated indeterminate
diameter fasteners, it was normal for taps in the 1800s to be tapered; you'd tap the nut deeper
until it fit to the screw.
Click to expand...

It's nowhere near that old, I don't think...

Maybe 1980's or 90's... just a guess, though...

-Bear
 
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