True or False: Countersinking creates a conical recess at the top of a hole intended to accommodate a fastener.

Countersinking is a machining process that involves creating a conical recess at the top of a hole. This recess is specifically designed to allow a fastener, such as a screw or bolt, to sit flush with or below the surface of the material into which it is installed. The purpose of this process is to reduce the risk of damage to the fastener and the surrounding material, as well as to improve the overall aerodynamics and aesthetics of the assembly.

For fasteners that require a countersunk head, this conical shape helps to ensure that the fastener can be securely tightened without protruding from the surface. This is particularly important in aerospace applications, where the integrity of the surface and streamlined design are crucial for performance and safety. Therefore, the statement that countersinking creates a conical recess at the top of a hole intended for a fastener is true, as it describes the fundamental purpose of this important assembly technique.