Are you sayiing that there is a female 12 x 1 thread on the back of the chuck
that I saw at ...


Yes.

A perfect fit for the headstock, tailstock or milling attachment of the DB200
or SL1000 Unimat.

The "register" of the chuck is a perfect match for the above-mentioned Unis.

The actuators are very nice, too. Hardened steel with knurled handles.

The included #2 MT arbor is easily removable, and allows for Uni workholding
accessories to be used on larger machines.

A pretty good deal for under thirty bucks.

Too bad it isn't a 3" chuck.