The Robert Charles Plain Shank Counterbore is a high-precision cutting tool built for machinists and automotive technicians who need clean, accurate counterbores with repeatable results. Crafted from M35-HSS-E with 5% cobalt, it delivers superior heat resistance, wear life, and dependable cutting performance in demanding materials.

• Material: M35-HSS-E with 5% cobalt for enhanced heat resistance and edge retention during heavy cutting.
• Shank Type: Plain shank design for easy fitment in standard tool holders and stable, reliable machining.
• Pilot Size: 0.195 inch pilot diameter for precise centering and clean hole starts.
• Counterbore Size: Designed for #8 cap screw applications, aligning with common fastener sizes.
• Flute Geometry: Precision-ground flutes deliver clean, square counterbores with minimal burrs and smooth chip evacuation.
• Applications: Ideal for precision engineering, automotive work, and general workshops where durability and consistent results matter.

With this counterbore, you can achieve flush seating of cap screws in metal assemblies without chatter or burn marks. The cobalt-enhanced HSS-E maintains a sharp edge at higher speeds, enabling efficient material removal and extended tool life. The plain shank simplifies setup in conventional tool holders, helping you maintain accurate depths and square shoulders across production runs. This makes the tool well-suited for precision tasks in engineering shops, automotive repair, and general machining environments where dependable performance and repeatable results are essential.