Countersink: include both adverse allowancesMinimum board thickness2.00 − 0.10 = 1.90 mmMaximum conical recess depth1.40 + 0.10 = 1.50 mmRemaining axial thickness1.90 − 1.50 = 0.40 mm³Ô¹Ïtv · Original engineering schematic · Illustrative, not to scale