If the pin is cylindrical, the bottom hole is 7. 8, then with a 8 reamer hinge. Generally stay 0. 2-0. 3mm margin hinge processing. The machine hinge can enlarge a little.
If it is a tapered pin, the bottom hole is 8 and then a 1:50 reamer hinge.
Locating pin hole dowel hole:
A hole for inserting a locating pin designed to accurately position two parts adjacent to the die, also known as a guide pillar.