What is Countersink

By Bester PCBA

Last Updated: 2023-07-26

What is Countersink

A countersink is a cone-shaped hole that is specifically drilled into a printed circuit board (PCB) to accommodate a flat head screw or fastener. This type of hole allows the screw head to sit flush with the surface of the PCB, creating a smooth and even finish. Countersinks are commonly used in the PCB industry to ensure proper alignment and fit of components.

To create a countersink hole, precision is required in determining the correct angle. Different angles are available for countersinks, with 90, 82, and 60 degrees being the standard sizes. However, other angles such as 120, 110, and 100 degrees can also be used depending on the design requirements.

The depth of the countersink hole is determined by the major hole diameter and the angle of the sink. It is important to consider the size of the screw head and the desired fit when determining the size of the countersink hole. Additionally, the placement and orientation of the countersink holes may vary depending on the design and requirements of the PCB.

Frequently Asked Questions

How Do You Define a Countersink

To define a countersink, it is the act of causing the head of a screw, bolt, or similar object to sink into a pre-made depression, resulting in it being flush with or below the surface.

What Does Countersink Mean in Engineering

Countersinking in engineering refers to the process of cutting a conical hole into a metal object. This technique is commonly employed to provide room for the head of a screw or bolt to sit flush with the material’s surface or to remove any burrs that may have been left behind during drilling and tapping.