The operation of smoothing and squaring the surface around a hole is known as

A Counter-sinking
B Counter-boring
C Trepanning
D Spot facing

Correct Answer: Spot facing

The most common application of spot facing (spot facing) is facing the area around a bolt hole where the bolt's head will sit, which is often done by cutting a shallow counter bore, just deep enough "to clean up"—that is, only enough material is removed to get down past any irregularity and thus make the surface flat.
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