The Robert Charles Plain Shank Counterbore in M35-HSS-E with 5% cobalt is built for demanding metalworking tasks where precision and durability matter. Designed for professionals in precision engineering, automotive, and general workshops, it delivers clean, accurate counterboring with long tool life.

• Material: M35-HSS-E with 5% cobalt for enhanced heat resistance and wear life under demanding counterboring cuts.
• Shank Type: Plain shank engineered for easy fitment in standard tool holders, ensuring stable, reliable machining.
• Cap Screw Size: 7/16 cap screw compatibility for common fastening applications.
• Pilot Size: 0.468 inch pilot to improve hole location accuracy and concentricity during operation.
• Design Purpose: Specifically crafted for precise, consistent counterboring in a range of metalwork projects.

This counterbore combines robust construction with dependable performance, helping you achieve flush, accurate fastener seating and clean hole preparation. Its cobalt-enhanced HSS composition supports steadier cutting temperatures and extended tool life, making it a smart choice for projects that demand repeatable results and reduced rework in steel, aluminum, and other common metals. Pair it with a compatible tool holder and follow appropriate machining practices to maximize accuracy and finish quality in every job.