Question

this type of hole has a cylindrical recess around the hole at the surface. it is often used to receive a bolt head or nut. identify the hole type circled in red:

Explanation:

• Countersink: A conical recess around a hole.
• Counterbore: A cylindrical recess around a hole.
• Tapped: A hole with internal threads.

The problem describes a cylindrical recess (which matches the definition of a counterbore) used to receive a bolt head or nut.

Answer:

Counterbore