Countersinks & Counter Bores

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Countersinks & Counter Bores

Countersinks & Counter Bores


Countersinks and counter bores are used to enlarge part of a new or existing hole to hide the head of a screw, bolt or seat a nut.

Counterbore has a flat bottom e.g. bolt head.
Countersink is a conical hole e.g. bugle head screw

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