A counterbore hole is usually used when the head of a fastener, such as a hex head or socket head capscrew, is required to be flush with or below the level of a workpiece's surface.

Dec 16, 2022 · A counterbore involves adding a stepped hole, that recesses the head of the fastener (and washers where fitted). This cavity is cylindrical and generally flat/perpendicular …

Counterboring is the secondary machining process of creating a cylindrical shape at the top of a hole using a counterbore. Counterbored holes are often used to recess socket head cap …

Feb 16, 2021 · What is a counterbore? A counterbore is a circular hole with a flat bottom which coincides with another hole. The counterbored section allows a bolt head or other fastener to …

A counterbore hole is typically used when a fastener, such as a socket head cap screw or fillister head screw, is required to sit flush with or below the level of a workpiece's surface.

Sep 19, 2023 · Learn the key differences between counterbore and countersink holes. Compare symbols, angles, applications, machining, and costs for CNC, PCB, and mechanical design.

Dec 29, 2025 · Below is an article that explores the common root causes of countersink/counterbore defects in mass production, which provides solutions all the way from …

In this article, we’ll define counterbore holes, explain when to use a counterbore, and describe how to call out a counterbore hole in your designs so that it’s manufactured properly.

Dec 30, 2024 · A counterbore creates a flat-bottomed, enlarged opening so that the head of a screw or bolt can sit flush with or below the surface, while a countersink creates a conical …

Discover the key features and benefits of counterbore holes, along with their machining process and common challenges in our latest blog!