6.3mm Countersink 90° HSS-E Coated Three-Point, High Wear Resistance - Ruko GmbH

Take advantage of the combination of low feed forces, precise surface finish and robust HSS‑Co5 wear resistance for reliable, repeatable countersinking. Order the tool directly via Metav Werkzeuge or consult our specialists for application advice.

ULTIMATECUT 90° Countersink, 6.3 mm HSS‑Co5 (DIN 335C) – RUKO

The ULTIMATECUT 90° Countersink is a three‑flute countersink built to DIN 335C standards for calm, rattle‑free chamfering and efficient chip evacuation across a wide range of materials

• Reduced axial and radial forces for smooth chamfering
• Variable relief for quiet, rattle‑free sinking
• Wide chip flute for superior chip and heat removal
• HSS‑Co5 construction for high wear resistance

Consistent chamfers through optimised cutting geometry

The newly developed cutting geometry reduces both axial and radial forces, resulting in a noticeably calmer cutting action and a consistently round, rattle‑free surface on the chamfer. The design includes a variable relief that changes along the cutting edge to prevent chatter and minimise vibration; this produces a clean finish without repeated polishing or rework. Compliance with DIN 335C ensures dimensional compatibility with standard countersinking applications and supports process reliability in production environments.

Improved chip flow and thermal management for longer life

A combination of an extra‑wide chip flute, tailored chip angle and an optimised transition radius provides effective chip evacuation and improved heat dissipation. These parameters reduce built‑up edge formation and material welding on the cutting edges, particularly when machining softer alloys. Manufactured from HSS‑Co5, the tool offers enhanced hardness and temperature resistance, delivering high wear resistance under both low and high cutting speeds. The ULTIMATECUT therefore sustains cutting performance for extended tool life and steady surface quality.

Lower feed forces and broad material capability reduce machine load

The advanced geometry significantly lowers the required feed force during countersinking; in steel, the recommended feed under loads up to 800 N is 0.15 mm/rev, allowing controlled material removal with less operator strain and reduced spindle stress. The tool’s resistance to material welding and its capacity to run at varying cutting speeds make it suitable for numerous materials and workshop conditions. Reduced feed demands translate into fewer rejects and a smoother workflow in both one‑off and batch production.

Choose the RUKO ULTIMATECUT 90° Countersink for precise, low‑force chamfering and contact Metav Werkzeuge for ordering or technical guidance at info@metav-werkzeuge.com or +49 2822 7131930

Technical Data

• Article number: 8000422470NW

Facts

• Diameter: 6.3 mm
• Angle: 90°
• Flutes: 3
• Feed (steel, up to 800 N): 0.15 mm/rev
• Standard: DIN 335C

Special features

• Three‑flute cutting geometry
• Variable relief for quiet operation
• Extra‑wide chip flute for chip evacuation
• Optimised chip angle and transition radius
• HSS‑Co5 material (5% cobalt)
• High wear resistance
• Reduced axial and radial cutting forces
• Counteracts material welding on the cutting edge
• Suitable for high and low cutting speeds
• Smooth, round and rattle‑free surface finish

FAQ

What materials can be machined with this countersink?
The RUKO ULTIMATECUT 90° Countersink (SKU 8000422470NW) is designed for a wide range of materials; its HSS‑Co5 composition and chip‑clearing geometry reduce welding and perform well across common metals and alloys.

How does the ULTIMATECUT geometry improve surface finish?
The tool’s variable relief and three‑flute design produce reduced axial and radial forces, so the ULTIMATECUT creates a smooth, rattle‑free chamfer that typically requires less secondary finishing.

Is this countersink suitable for high‑speed machining?
Yes. The RUKO ULTIMATECUT combines HSS‑Co5 hardness with optimised chip evacuation, enabling consistent results at both high and low cutting speeds without compromising finish quality.

What feed parameters are recommended for steel?
For workpieces where the feed load reaches up to 800 N, a feed of 0.15 mm/rev is recommended with the ULTIMATECUT to achieve controlled material removal and long tool life.

How does the wide chip flute benefit production?
The extra‑wide chip flute on the ULTIMATECUT improves chip evacuation and heat dispersion, lowering the risk of built‑up edge and extending usable tool life in continuous production runs.

Manufacturer / Responsible: Metav Werkzeuge GmbH; Parkring 45; 46446 Emmerich; Germany; +49 2822 7131930; info@metav-werkzeuge.com