High-Speed Steel Single-End Countersink Set KEO 6-Flute 82° 1/4″-1″

Description

Product Overview

The KEO 55038 High-Speed Steel Single-End Countersink Set is engineered for precision and durability in demanding machining environments. Constructed from uncoated high-speed steel, each cutter offers a bright finish that resists wear while maintaining a sharp cutting edge. The set includes seven sizes ranging from 1/4″ to 1″ body diameter, each featuring a consistent 82° point angle that produces clean, burr‑free holes essential for fastener installation and component assembly. Six flutes per cutter provide smooth chip evacuation, reducing heat buildup and extending tool life. The robust design balances hardness and toughness, delivering reliable performance across a variety of metals, including carbon steel, alloy steel, and many non‑ferrous alloys. With a bright, uncoated finish, the tools are ready for immediate use without the need for additional surface treatments.

Usage

These countersinks are ideal for professional machinists, maintenance technicians, and small‑shop fabricators who require consistent hole quality in high‑volume production or custom projects. The 82° angle matches standard flat‑head screw specifications, making the set perfect for assembling machinery, automotive components, and electronic enclosures. The range of body diameters allows users to tackle a wide spectrum of hole sizes without changing tools, improving workflow efficiency. Whether you are drilling into mild steel for a bolt head, creating clearance holes in aluminum for lightweight structures, or preparing surfaces for rivet installation, the KEO set provides the versatility needed for diverse applications. Its high-speed steel composition ensures the cutters retain their geometry even under elevated temperatures, making them suitable for high‑speed drilling operations on CNC machines, manual drill presses, and handheld power drills.

Why Choose Us

Choosing the KEO 55038 countersink set means selecting a tool that combines proven material science with thoughtful engineering. High‑speed steel offers a unique blend of hardness and impact resistance, delivering a tool that can withstand the rigors of daily shop use while maintaining edge sharpness. The uncoated bright finish eliminates the need for additional processing steps, reducing overall cost and simplifying inventory management. KEO Cutters, the manufacturer, has a long history of producing reliable cutting tools, and each set undergoes rigorous quality control to ensure dimensional accuracy and consistent performance. Our commitment to customer satisfaction includes responsive technical support, a clear warranty policy, and access to replacement parts if needed. By investing in this set, you gain a reliable solution that minimizes downtime, reduces the frequency of tool changes, and supports the high‑precision standards required in modern manufacturing.

Key Features

• Six flutes per cutter provide efficient chip removal, reducing heat and extending tool life.
• Consistent 82° point angle creates clean, burr‑free holes for reliable fastener seating.
• Uncoated high‑speed steel offers a balance of hardness and toughness for wear resistance.
• Set includes seven sizes from 1/4″ to 1″ body diameter, covering a broad range of applications.
• Backed by KEO’s dedicated customer support and warranty for peace of mind.

FAQ

What material is the countersink made of?

The countersinks are made from uncoated high‑speed steel, which provides a combination of hardness and toughness that is ideal for general‑purpose machining and offers excellent wear resistance.

How many sizes are included in the set?

The set contains seven cutters with body diameters of 1/4″, 5/16″, 3/8″, 1/2″, 5/8″, 3/4″, and 1″. This range allows you to handle a wide variety of hole sizes without needing additional tools.

Can these countersinks be used on stainless steel?

Yes, the high‑speed steel construction is suitable for drilling into stainless steel and other alloyed metals. The six‑flute design helps to evacuate chips efficiently, which is especially important when working with tougher materials.

What is the advantage of an uncoated tool versus a coated one?

Uncoated tools like this set have a bright finish that provides consistent performance without the added cost of coating processes. They are versatile for many applications and can be re‑sharpened easily, extending their service life.

How should I maintain the countersink set for optimal performance?

After each use, clean the cutters to remove metal shavings and apply a light oil coating to prevent corrosion. Store the set in a dry environment and inspect the cutting edges regularly; if they become dull, re‑sharpening with a proper grinding wheel will restore their cutting efficiency.