Robert Charles Metric Piloted Countersink - 3 Flutes - Integral Pilot - Straight Shank - 4.0mm Pilot Diameter - 90° Inclusive Angle

The Robert Charles Metric Piloted Countersink – 3 Flutes – Integral Pilot – Straight Shank is engineered for precise, repeatable countersinking of metric pre-drilled holes. Built for workshop, maintenance, and production machining, it delivers clean, concentric results with minimal chatter.

Its integral pilot keeps the cutter aligned during the cut, preventing wander and ensuring consistent seating. The 3-flute geometry provides smooth cutting, strong stability, and efficient chip evacuation across steels, aluminium, and plastics.

• Integral pilot for accurate alignment: Keeps the countersink centered in the hole, prevents wandering, and delivers concentric seating with every pass.
• 3‑flute cutting geometry for smooth cutting: Provides stable cuts, reduces chatter, and promotes efficient chip evacuation for a cleaner finished hole.
• Metric-ready with 4.0 mm pilot diameter and 90° included angle: Matches metric pre-drilled holes for flush seating and reliable fastener performance across a range of materials.

With its piloted design and robust geometry, this countersink helps you reduce rework, speed up setups, and achieve a professional-looking finish in every project. It supports a broad range of materials, enabling reliable, repeatable results for both production runs and on-demand maintenance, ultimately improving workflow and overall performance.