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In machining, a counterbore (symbol: ⌴) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature. 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.
A counterbore is a flat-bottomed cylindrical hole that is larger than and coaxial to another cylindrical hole. It is used to provide a flat and recessed mounting surface for mating parts. The hardware most commonly used with a counterbore is a socket head cap screw.
Counterbore What Is a Counterbored Hole? A counterbore is a simple hole with a wider hole above it. The 3D model below shows a counterbore with the same counterbore next to it cut in half:
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 be recessed. What does a counterbore look like?
A counterbore is a cylindrical hole, with a flat bottom that is larger than and coaxial to another cylindrical hole below it. The counterbore serves to provide a recessed and flat surface for mating parts, and typically, socket head cap screws are used with counterbores.
The main difference between a counterbore hole and a spotface hole is the depth of the upper cavity. A counterbore hole is typically deep enough to place a fastener's head below a part's surface. This can vary depending on the type of fastener you use and how broad the head is.
The key difference between countersinks and counterbores is their shape. The shape of a countersink is conical. In other words, the diameter of the countersink hole is larger on the material’s surface, and narrower at the hole’s end – where it meets with the primary hole through which the fastener is driven.
Countersunk holes are used for wood and metal screws, while counterbores are mainly used for larger fasteners, like lag bolts. Generally, countersinks need smaller pilots than counterbores, which is why the latter is used for heavy-duty tasks in construction, machinery, and automotive.
Counterboring is a machining process that creates a flat-bottomed hole that enlarges a pre-existing hole. This method is especially useful in CNC machining when you need to prepare a hole to fit a bolt head or any other fastener so it sits flush with or below the surface of your material.
A counterbore creates a cylindrical flat-bottomed hole, enlarging an existing hole to accommodate a fastener head. This process ensures that the head of a bolt or screw sits flush with the surface of the material, providing a larger surface area for the fastener and a cleaner finish.