Before assembly, the machinist measured each counterbore to confirm the screw heads would sit flush with the bracket.

Please counterbore the hole so the carriage bolt head sits flush.

The machinist counterbored the metal plate so the bolt heads would sit flush.

The machinist inspected the counterbores to ensure the screw heads would sit flush.

He is counterboring the metal plate to seat the bolt heads flush.

The engineer measured the counterboring to confirm the screw heads would sit flush with the surface.

The machinist scheduled several counterborings on the metal plate to ensure the screws sat flush.