nut slot depth specs and info

When installing new nuts, I measure with feeler gauges and a radius gauge under the file when slotting a nut but for your purposes you can do

Nut slots need care and attention to detail I do it by feel, by doing it very slowly, and a little at a time If the slots become too deep,

nut slot depth With normal string heights for a steel stringed guitar at the 12th fret , a nut cut to same heights

nut slot files The depth can simply be done with the nut in place and using a 012 feeler gauge or a 12 string as a feeler gauge to measure the gap between