The Robert Charles Plain Shank Counterbore is a high‑performance cutting tool designed for precise counterboring in hard materials. Tailored for engineers, machinists, and automotive technicians, it delivers clean, accurate pockets with durable, repeatable results.

• Material: M35 HSS‑E with 5% cobalt for excellent heat resistance, wear life, and cutting performance.
• Shank Type: Plain shank for easy fitment in standard tool holders, ensuring stable and reliable machining setup.
• Pilot Size: 0.169" pilot to guide the cutter for accurate alignment and depth control.
• Cap Screw Compatibility: Sized for #6 cap screw interfaces, supporting proper seating in related assemblies.
• Design & Geometry: Optimized counterbore geometry to deliver clean pockets with minimal burrs and consistent shoulder quality.
• Ideal Use: Perfect for precision engineering, automotive work, and general workshop counterboring tasks where durability matters.

In demanding machining scenarios, this counterbore pairs long tool life with dependable performance. The cobalt-infused steel withstands heat and wear, while the plain shank provides straightforward installation in common holders. Expect repeatable, high‑quality counterbores that support tight tolerances and efficient assembly workflows, whether you’re preparing fastener seats in precision components or preparing housings and covers in automotive applications.