DFM - Non Plated Hole - Soldermask FHS + 10mil

Design for Manufacturability (DFM) for Non Plated Thru Hole (NPTH) the soldermask opening should be finished hole size (FHS) + 10mils.

Example: NPTH for test fixture tooling, soldermask = FHS + 10mil (0.25mm)

In Altium this means the Soldermask expansion should be +5mils (0.125mm).

You should also include a copper keep out on all layers of FHS + 10mils.

There are no Design rules or DRCs in Altium for Non-Plated Thru Holes that will catch this DFM issue.