The production hole diameter (PHD) is the diameter of the tool used in production to drill the hole.
Production Hole Diameter or Toolsize = Finished Hole Size plus:
- + 0.10mm/4mil for Plated Through Holes
- + 0.00mm/0mil for Non Plated Through Holes
The difference in diameter between PHD and the finished hole size for plated through holes is the copper plating in the hole and the applied finish (HAL, ENIG, etc…)
See here how holes are drilled in our production.