Description
h2>Product Overview
Accusize’s 7-piece metric HSS counterbore set is engineered for precision and durability in industrial and scientific applications. Featuring 3 flute, straight shank design, this set includes sizes M3, M4, M5, M6, M8, M10, and M12 for versatile use with cap screws. Made from high-speed steel, these tools ensure long-lasting performance and accurate recessing for flush or countersunk screw heads. Ideal for mechanical assembly, fabrication, and maintenance tasks where precision and reliability are critical. The set is designed for professional use in workshops, manufacturing plants, and engineering environments where consistent performance is required.
h2>Usage
This counterbore set is ideal for industrial machinists, fabricators, and maintenance technicians who need to install cap screws with flush or countersunk heads. Common applications include assembling machinery, equipment, and structural components where aesthetic finish and functional alignment are important. The straight shank design ensures smooth insertion into workpieces, while the HSS material withstands high torque and heat during operation. Suitable for use with metal, aluminum, and other hard materials commonly found in industrial settings. The set is compatible with standard cap screws and can be used with drill presses, hand drills, or benchtop tools for precise control.
h2>Why Choose Us

Accusize delivers precision-engineered tools built for demanding industrial environments. Each counterbore is manufactured with high-speed steel for superior hardness and wear resistance, ensuring long service life. The 3-flute design reduces chip buildup and improves cutting efficiency. The straight shank design ensures accurate alignment and smooth operation. The set includes all essential metric sizes for common cap screw applications, eliminating the need for multiple tools. Accusize provides reliable customer support and product documentation to ensure optimal use and longevity. All tools are designed for professional-grade performance and are backed by the manufacturer’s commitment to quality.
h2>Key Features
- High-speed steel construction for durability and heat resistance in demanding industrial applications.
- 3-flute design reduces chip accumulation and improves cutting efficiency for smoother operation.
- Straight shank design ensures accurate alignment and easy insertion into workpieces.
- Complete metric set (M3 to M12) for versatile use with common cap screw sizes.
- Professional-grade craftsmanship with consistent tolerances for precise recessing and flush screw heads.
- Accusize offers reliable customer support and technical documentation for optimal tool usage.
- Designed for use with drill presses, hand drills, and benchtop tools for flexible installation.
- Lightweight and compact for easy storage and portability in workshop or field environments.
h2>FAQ
What is a cap screw counterbore?
A cap screw counterbore is a tool used to create a recess in a workpiece for the head of a cap screw. It allows for a flush or countersunk appearance, making the screw head sit flush with the surface of the material. This is commonly used in mechanical assembly, fabrication, and maintenance tasks where a clean, professional finish is required.
What materials are these counterbores made from?
These counterbores are made from high-speed steel (HSS), which provides excellent hardness, wear resistance, and heat tolerance. This material is ideal for industrial applications where tools are subjected to high torque and prolonged use.
What sizes are included in this set?
This set includes 7 metric sizes: M3, M4, M5, M6, M8, M10, and M12. These sizes cover most common cap screw applications in industrial and scientific environments.
Can these tools be used with hand drills or drill presses?
Yes, these counterbores are designed for use with hand drills, drill presses, and benchtop tools. The straight shank design ensures compatibility with standard drill chucks and provides smooth operation for precise recessing.
What is the difference between a cap screw counterbore and a standard counterbore?
A cap screw counterbore is specifically designed for cap screws, creating a recess that matches the head of the screw for a flush or countersunk appearance. A standard counterbore may be used for other types of fasteners or applications, but the cap screw counterbore is optimized for cap screw installation and alignment.






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