Robert Charles Single Flute Countersink 90° - M35-HSS-E 5% Cobalt - Metric - 6.0mm Head Dia

The Robert Charles Single Flute Countersink 90° is a precision tool designed for countersinking, chamfering, and deburring metric holes with clean, consistent results. It features a 6.0 mm head diameter to fit standard metric applications and deliver flush, accurate seating of fasteners in a single pass.

Made from M35 HSS-E with 5% cobalt, this countersink combines hardness and heat resistance to outperform standard high-speed steels. The cobalt-enhanced steel stays sharp longer and stands up to tougher materials like stainless steel and alloy steels, while still being suitable for non-ferrous metals.

• 90° single-flute design: Delivers clean, consistent countersinks with smooth edge finishes and reduced clogging, enabling chamfering and deburring in a single, efficient pass.
• Premium M35 HSS-E with 5% cobalt: Provides superior wear resistance and heat tolerance for longer tool life, reducing downtime and tool changes in challenging materials.
• 6.0 mm head diameter: Ensures precise, repeatable results across common metric hole sizes, helping maintain accurate seating and finish with less rework.

This countersink is built for reliability in professional shops and on demanding jobs, offering predictable performance, durable construction, and confidence every time you start a hole. Whether you’re finishing stainless steel brackets, alloy steel housings, or aluminum components, this tool helps you achieve sharp, uniform chamfers with less effort and fewer passes.