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What is the difference between Countersink and Counterbore?

A Countersink is a tapered spot facer used to machine conical countersunk holes, common angles 90 degrees, 60 degrees and 120 degrees. A Counterbore is a flat-bottomed cutter for cylindrical counterbore holes that lets hex socket bolt heads sit flush with the workpiece surface. Lihao Technology offers both - choose according to your drawing requirements.

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