I occasionally run into 12-24, and some small sizes like 5-40 4-36 on
dividers and calipers, the choices are endless on old stuff.  I just buy
every old tap and die set I find.

I got my pair of 12-20  at $40, but now more availability

You can get your die here
https://www.victornet.com/detail/RD-12-20-B.html

And choices on taps
https://www.victornet.com/searchresults.html?q=12-20+tap

Kirk in Half Moon Bay, CA, looking for a lost pressure regulator for a
grill last night.

On Tue, Sep 20, 2022 at 7:57 AM Ray S.  wrote:

>
> I recently bought a Disston Compass saw that is complete but cosmetically
> worn, including a wavy blade with the requisite rust and white paint.
> I took it apart as a first step towards starting work on it in preparation
> for putting it aside for month's (Years?)  before getting back to it. 😊
> While apart I though "Lets make a quill to screw the saw nuts into for
> cleaning on my drill."
> My eyeball gauge indicated an anomaly in front of me and after doing some
> measuring and checking with a thread gage I now believe that I am looking
> at a #12-20 thread.
> I  guess it was foolish of me to believe that this affliction was reserved
> only for Stanley tools.
> Where I live used to have many tradesmen, toolmakers, machinists and I
> often buy stuff and sometimes find odd sizes of tooling in my collection.
> Not this size though.
>
> Does anyone have any recommendation for Taps and Die sizes that are used
> most often in tool restoration efforts?
> It most likely won't be worth the expense at this time in my life, but I
> need to at least check on it.
> Thanks.
>
>


-- 
Kirk Eppler in Half Moon Bay, CA