8.3mm Countersink 90° HSSE-Co Solid Carbide Coating High Wear Resistance, 0.15mm/rev - Ruko GmbH

Take advantage of reduced axial and radial forces and the HSS‑E Co5 alloy for consistent, burr‑free countersinks; order directly via Metav Werkzeuge or consult the technical team for application guidance.

ULTIMATECUT countersink DIN 335C — 90° Ø8.3 mm, HSS‑E Co5 | RUKO

The ULTIMATECUT countersink is a high‑performance 90° countersink designed for precision finishing and quiet, rattle‑free chamfering across a wide range of metals and alloys.

• Reduced axial and radial forces
• Smooth, burr‑free finish
• Wide flute for fast chip evacuation
• High wear resistance from HSS‑E Co5

Faster, more stable countersinking through optimized geometry

The key engineering advantage of this countersink is its completely redesigned cutting geometry, which significantly lowers both axial and radial forces during the operation. Lower forces mean less vibration and a smooth, burr‑free finish on the chamfer, reducing the need for secondary deburring and improving throughput in serial production. The tool’s geometry also counters material welding on the cutting edges, extending service intervals and supporting more consistent part quality over time.

Efficient chip and heat management for longer tool life

A combination of a wide flute and carefully tuned chipbreaker parameters delivers effective chip evacuation and heat dissipation. The optimised span angle and transition radius allow the tool to run at both high and low cutting speeds without compromising the chamfer quality, while the HSS‑E alloy boosts toughness and abrasion resistance. This balance between thermal control and mechanical stability translates into high wear resistance, making the tool particularly suitable for demanding workshop and industrial tasks.

Predictable feed performance and broad material compatibility

The tool’s layout reduces the required feed force, enabling reliable countersinking with lower thrust. In steel applications the recommended feed performance is 0.15 mm/rev at up to 800 N feed force, which supports controlled material removal and consistent hole geometry. The design performs well across common engineering materials, providing a dependable option for finishing, chamfering and preparation tasks where dimensional accuracy and surface quality matter.

Contact Metav Werkzeuge for precise application advice or to discuss material‑specific parameters — eMail: info@metav-werkzeuge.com | Tel: +49 2822 7131930

Technical data

• Item number: 8000422471NW
• SKU: 8000422471NW
• Label: ULTIMATECUT countersink DIN 335C 90° Ø8.3 mm HSS‑E Co5 RUKO
• Packaging unit: 1
• UID: 8000422471NW

Facts

• Diameter: 8.3 mm
• Angle: 90°
• Material alloy: HSS‑E Co5
• Feed in steel up to 800 N: 0.15 mm/rev

Special features

• DIN 335C countersink design
• Newly developed cutting geometry for reduced forces
• Variable relief for a quiet countersinking process
• Wide flute and optimised chip space for heat and chip removal
• Designed to reduce material welding on edges
• Suitable for a wide range of cutting speeds

FAQ

What materials can this countersink be used on?
The ULTIMATECUT countersink is engineered for a broad range of metals; its HSS‑E Co5 construction and flute design enable reliable countersinking across typical workshop materials.

Does the tool require a special feed rate for steel?
For steel applications a guide value of 0.15 mm/rev at feed forces up to 800 N is stated to ensure stable performance and consistent chamfer quality.

How does the geometry affect surface finish?
The optimised cutting geometry and variable relief minimise vibration and welding, producing a smooth, burr‑free finish that reduces the need for secondary deburring.

Is the countersink compatible with high cutting speeds?
Yes, the combination of geometry and chip evacuation allows operation at both high and low cutting speeds without loss of quality in the countersink.

Which standard and size does the tool follow?
This tool conforms to DIN 335C, with a 90° cutting angle and an effective diameter of 8.3 mm.

Manufacturer/Responsible: Ruko GmbH Präzisionswerkzeuge, Robert‑Bosch‑Strasse 7, 71088 Holzgerlingen