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Countersink holes PCB (counterbore PCB): A common usage of countersink or counterbore holes is to permit the tapered head of a screw to sit flush with the top or bottom of the laminate. The cone angle is typically 82 or 90 or 135 degrees.
Material /Laminate: FR4 TG150
Board thickness: 2.0mm
Copper weight: inner & outer 1oz
Typically, the countersink hole has 3 types degree, 82°, 90° and 135°.
Parameter for countersink hole as below,
1. Countersink hole size is less than 6.5mm can be drilled normally, if the hole size more than 6.5mm, then need to expand the drill, the size controlled by +/-0.15mm.