Answer
Nov 27, 2025 - 05:52 AM
Counterboring creates a flat-bottomed, larger-diameter hole so that a fastener head (like a bolt or xxxx ) sits flush with or below the surface. Countersinking creates a conical hole that allows the head of a countersunk xxxx to sit flush with or below the surface. The main difference is the shape of the hole: flat-bottomed for counterboring and angled for countersinking.
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