NX Countersink operation tool depth without a modeled hole edge chamfer

In holemaking, a countersink operation will drive the tool to a depth that creates a countersink on the part even if the chamfer is not modeled. How does NX determine the depth or diameter of this countersink?

If there is no countersink modeled, NX uses a default constant value added to the modeled hole cylinder diameter to determine the countersink diameter. The software adds 2mm to the diameter for metric parts and 0.100" to the diameter for inch parts, and then drives the countersink tool deep enough to achieve that diameter.  These default values are part of the core code and are not user configurable.

If part dimensional tolerances require a specific countersink depth or diameter, best practice is to model the hole with that chamfer included and then set the countersink operation to use that face in the operation, e.g.

Set the Machining Area to "FACES_TOP_CHAMFER" so the tool will go to that modeled 14.5mm diameter instead of using the hole face diameter of 10mm plus the 2mm standard that would generate a 12mm countersink: