37 Countersink

Countersinking allows for flush and secure attachment. Countersinking is the process of creating a conical recess in a workpiece to accommodate the head of a screw or bolt, allowing it to sit flush with the surface. This is typically done when using flat-head or oval-head screws in plastic or other materials. To countersink, you first drill a pilot hole, then use a countersink bit to enlarge the top portion of the hole to the desired depth and angle. 

If the countersink tool does not adequately reach, then you’ll need to use a reverse countersink tool.

Be extremely careful not to “over-countersink” the hole leaving less material and potential for failure.

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