The Robert Charles Plain Shank Counterbore is a precision cutting tool built for machinists, engineers, and workshop professionals who demand clean, accurate counterbores with reliable, repeatable performance. Crafted from M35 HSS-E with 5% cobalt, it delivers strong heat resistance and wear life to tackle demanding metalworking tasks.

• Material: M35-HSS-E with 5% cobalt for improved heat resistance and extended edge life.
• Shank Type: Plain shank designed for straightforward fitment in standard tool holders, enabling stable, efficient machining.
• Pilot Size: 0.143 inch pilot ensures precise starting alignment and consistent counterbore concentricity.
• Cap Screw Compatibility: Sized for #4 cap screw applications, making it suitable for common assembly hardware.
• Applications: Ideal for precision engineering, automotive work, and general workshop counterboring tasks where durability and consistency matter.

This counterbore delivers dependable, repeatable results by maintaining alignment and reducing setup time, thanks to its plain shank and robust cobalt-infused steel. It’s a practical choice for professionals who routinely perform high-precision counterboring across a range of materials, ensuring clean finishes and reliable performance batch after batch.