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What is countersinking for metal fabrication?

Baker 2017-09-12 11:32:20
Countersinking is a method of fabrication that creates an conical hole to allow the insertion of a rivet, bolt, screw or any other fastening device. This is so that the fitted device will sit flush with the rest of the sheet metal, and the sink is made within an existing hole.

The result is similar to standard screw opening. For instance, the way the hole is cut and threaded is exactly the same save for one major difference; at the top of the opening, a specialised piece cuts a much broader hole, and this is what allows the fastening piece to sit even with the surface.