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CountersinksSMWhen assembling cabinet parts using screws, drilling a clearance hole with a countersink is a necessity. A pilot hole for the screw may or may not be necessary at all. What’s the difference between a clearance hole and a pilot hole? A clearance hole will allow a screw to pass through it without the threads biting into the material. This is particularly important when using screws with threads that are formed on the entire length of the screw shank, as with drywall screws. A pilot hole, on the other hand, makes room for the screw shank yet provides material for the screw threads to thoroughly bite into the material securing the fastener. The pilot hole is necessary when the threat of splitting the material is likely. And the countersink, of course, allows the screw head to seat flush or below the face of the material.

The ideal drill bit for making all these required elements for fastening two pieces of wood together is very difficult to make and therefore not readily available.


 

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