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. This allows fasteners to be flush with or slightly below the surface, which is crucial for mechanical assemblies requiring a smooth, uninterrupted surface.

Countersunk hole dimensionschart

Carr Lane Mfg. is an industry-leading provider of counterbores for drill bushings and many other vital manufacturing products. Since 1952, Carr Lane Mfg. has provided innovative engineering products and solutions to a large variety of industries. Counterbores are an essential feature in precise and high-quality mechanical assemblies, providing both functional and aesthetic benefits. They are often used when assembling components in machinery, jigs, and fixtures where the screw or bolt heads need to be concealed or protected from wear and tear. However, each assembly is different, making it essential to find the correct counterbore size to meet your specific requirements.

In addition, a counterbore and spotface have many similarities. The former is used to recess a fastener while the latter is used to create a flat surface so a fastener can be used. In essence, a spotface is a shallow counterbore. Spotfaces ensure that the surface around the hole is smooth and perpendicular to the hole axis, providing a consistent surface for washers and bolt heads. This hole is commonly used for creating flat seating surfaces on rough or uneven workpieces.

Counterborehole dimensions in drawing

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Counterborehole dimensionsChartin mm

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The counterbore can be measured with different types of gauges, the simplest being a caliper. Other types of measuring equipment, such as pocket comparators, gage pins, and depth micrometers, are also used in measurement.

At Carr Lane Mfg., we understand the importance of quality and precision in every aspect of your operation. Our extensive selection of drill bushings is designed to work seamlessly with counterbores, ensuring accurate alignment and superior performance. Drill bushings serve as guides for drills and other cutting tools, maintaining precise hole locations and enhancing the longevity of your equipment.

CARR LANE MANUFACTURING 4200 CARR LANE CT. P.O. BOX 191970 ST. LOUIS, MO 63119 Phone: 314.647.6200 Fax: 314.647.5736

M10counterboreSize

Counterborehole dimensionschartinch

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The primary goal of counterboring is to enlarge an existing hole to create a flat-bottom, cylindrical recess that allows a screw or bolt head to sit flush with or below the surface of the workpiece. This process creates a cylindrical cavity with a larger diameter at the head of a pre-drilled conical hole. The pre-drilled hole is meant to contain the fastener and prevent the two workpieces from separating when their two flat surfaces are joined. The larger cavity matches at least the width and depth of the head of the fastener.

While they are similar, counterboring, countersinking, and spotfacing are different machining processes used to create specific types of holes in a workpiece to accommodate fasteners or to achieve a particular surface finish. A countersink has an angled bottom, whereas a counterbore has a flat one. This angled bottom on countersinks can vary slightly. While counterbores are typically used for cap screws, socket head screws, and other fasteners with cylindrical heads, countersinks are often used for flat-head screws and bolts.

This procedure most commonly uses a flat-bottomed-head screw to hold the object together. The screw will have a head that is below the surface of the piece being fastened. There are two cutting radii on the tool. One radius creates the counterbore hole, and the other radius creates the recessed cavity inside the material.

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The fastener can be placed anywhere between flush with the surface of the material and below the surface so that the head will not interfere with the design.

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M8counterboreSize

Counterborehole dimensionsChartmetric pdf

Counterbores are essential in many precision machining and assembly processes, providing the perfect solution for ensuring fastener heads sit flush or below the surface. Whether you’re working with machinery, jigs, fixtures, or any other application requiring smooth, unobstructed surfaces, counterbores offer the functionality and reliability needed to achieve professional results.

Explore our range of drill bushings and find the perfect fit for your counterboring needs. With Carr Lane Mfg., you gain access to high-quality, durable components that will help you achieve the best possible results. Browse our product catalog today to discover how our drill bushings can enhance your counterboring applications.

A counterbore is measured by several dimensions that ensure it fits the intended fastener and meets the requirements of the assembly. This can include:

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There are several types to choose from, depending on the type and length of your drill bushings. The charts below illustrate counterbore compatibility with Carr Lane Mfg. drill bushings of various sizes.

Counterborehole dimensions pdf

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Counterbores are cylindrical flat-bottomed holes that enlarge another coaxial hole. A counterbore can also refer to the tool used to create these holes (given the term counterbore cutter). The counterbore cutter or specialized drill bit creates the larger-diameter portion of the hole, often for applications where a smooth finish and a precise fit are critical. The hole is typically used when a fastener is required to sit flush with or below the level of a workpiece's surface. It is also used to create a perpendicular surface for a fastener head on a surface that isn’t.

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