Robert Charles Single Flute Countersink 90° - M35-HSS-E 5% Cobalt - Metric - 12.5mm Head Dia

The Robert Charles Single Flute Countersink 90° – M35 HSS-E 5% Cobalt – Metric is a precision tool designed for accurate countersinking, chamfering, and deburring of metric holes. It’s ideal for machinists, fabricators, service technicians, and hobbyists who demand clean, flush finishes and dependable results.

Crafted from premium M35 cobalt-enhanced high-speed steel, this countersink delivers exceptional hardness and heat resistance, so it stays sharp through stainless steel, alloy steels, and even non-ferrous metals. The 12.5 mm head diameter provides a robust cutting zone for reliable, repeatable performance.

• Premium M35 HSS-E with 5% Cobalt: Delivers higher hardness and heat resistance than standard HSS, extending tool life when countersinking tough metals and preventing rapid dulling.
• Precise 90° Single-Flute Design: Delivers clean, consistent chamfers with reduced chatter, improving surface finish and reducing burrs on every hole.
• Metric-Grade Construction for Tough Materials: Optimized for metric holes and materials like stainless steel and alloy steels, maintaining sharpness and delivering reliable results across demanding jobs.

This countersink helps you finish jobs faster with fewer corrections. The combination of a hard, cobalt-rich steel and a focused 90° geometry delivers consistent depth and smooth cuts, so assemblies sit flush every time. With longer tool life and dependable performance, you’ll experience less downtime, fewer replacements, and a smoother workflow from drilling to final deburring.