Robert Charles Single Flute Countersink 90° - M35-HSS-E 5% Cobalt - Metric - 16.0mm Head Dia

The Robert Charles Single Flute Countersink 90° – M35 HSS-E 5% Cobalt – Metric is a precision countersink bit engineered for accurate countersinking, chamfering, and deburring of metric holes. With a 16.0 mm head diameter, it provides robust material removal and consistent chamfer geometry to deliver reliable results.

Aimed at engineers, machinists, hobbyists, and maintenance professionals, this tool performs well on tougher materials thanks to its cobalt-enhanced M35 steel. The 5% cobalt content increases hardness and heat resistance, helping maintain a sharp edge for extended tool life when working with stainless steel, alloy steels, and non-ferrous metals, while still delivering a smooth, high-quality surface finish.

• M35 HSS-E with 5% cobalt for heat resistance: This cobalt-enriched steel holds a sharp edge longer and resists heat buildup, allowing longer cuts in stainless steels, alloys, and other demanding metals without frequent re-sharpening.
• 90° single-flute design for clean, precise chamfers: The single-flute geometry provides smooth entry and consistent countersinks, reducing chatter and producing uniform deburrs for fast, repeatable results.
• 16.0 mm head diameter for stability in metric work: A larger, rigid head ensures controlled guidance and reliable contact on metric holes, helping you achieve accurate countersinks with fewer passes.

This combination of durable materials, precise geometry, and metric-focused sizing helps you finish holes with confidence, improve workflow efficiency, and achieve dependable, repeatable results across a range of projects.