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.

A counterbore is a common feature in engineering and fabrication, representing a machined recess designed to accommodate the head of a fastener within a workpiece.

What Is a Counterbore? A counterbore is a hole-making tool that enlarges a portion of an existing hole to create a flat-bottomed recess for a screw, bolt, or nut head.

Oversized Counterbore Sets Cut oversized openings for a range of screw-head diameters to prevent binding

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 …

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 …

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 …

Dec 30, 2023 · This guide helps product developers and engineers choose the optimal counterbore solution for their specific requirements.

The counterbore enlarges an existing hole and has a flat bottom, ensuring that the head of the fastener sits evenly and securely while maintaining a common centerline with the initial hole.

Feb 12, 2024 · Dive deep into counterbore callouts and GD&T techniques. Take your machining skills to the next level with our comprehensive guide.