A counterbore is a cylindrical recess with a shoulder; a countersink is a conical recess. Name the intended feature and show its section with the actual hardware. “Recess the screw head” leaves the tool geometry, seating condition and remaining material unclear.
Start with the fastener
Provide the exact head geometry and any washer or seating component. A cylindrical head and a conical head need different seating details. The recess definition should include the relevant dimensions and location, not only the nominal screw thread size.
Show what remains underneath
In a carbon laminate, the required remaining construction needs review alongside the recess. A head appearing flush in a rendering does not establish a suitable joint. Include the laminate or local construction definition and ask the responsible engineer to review the seating and load path. This article specifies no universal recess depth or tightening torque.
Inspect the feature that was specified
Agree whether the check concerns recess geometry, hardware seating, flushness in an assembly or another requirement. Record the represented fastener and part revision with a sample fit check. If a supplier proposes a spotface or another alternative, retain the changed definition for review rather than treating all head-clearance operations as equivalent. A section drawing usually resolves the naming ambiguity before it reaches machining.
