Counterbore
Part of speech: verb
Definition: To create such a cylindrical recess.
Part of speech: noun
Definition: A cylindrical recess, typically machined around a hole to admit a screw so that it sits flush with a surface. The tool with which a counterbore is machined.
Spotface
Part of speech: noun
Definition: a shallow circular or cylindrical recess, machined on (for example) a cast part to offer a flat face against which to seat a fastener; a shallow counterbore
Part of speech: verb
Definition: to create or fashion a spotface