6.3-20.5mm 90° Countersink Set HSS-Co5 RUnaTEC Coating, DIN 355, Cylindrical Shank, Right-Hand - Ruko GmbH

Take advantage of the combination of durable HSS-Co5 construction and RUNaTEC coating for longer service life, precise 90° chamfers and efficient workshop throughput; order directly via Metav Werkzeuge or consult our specialists for individual application advice.

ULTIMATECUT 4S 90° Countersink Set, 6.3–20.5 mm — Ruko

The ULTIMATECUT 4S 90° Countersink Set is a compact workshop set for chamfering and countersinking tasks in stainless steel, structural steel, aluminium and plastics.

• RUNaTEC coating for extended tool life
• DIN 355 geometry for consistent results
• 90° cutting angle for standard chamfers
• Plastic cassette for organised storage

Precise chamfers that reduce rework

The set delivers consistent 90° chamfers thanks to its adherence to DIN 355 geometry, which ensures repeatable results across batches. Manufactured in HSS-Co5, the cutters maintain profile stability under intermittent high temperatures, producing burr-free edges and reducing manual finishing. For production environments, this leads to fewer rejects and a smoother downstream process, supporting predictable cycle times and quality control.

Durable performance through coating and material

A RUNaTEC coating extends cutting intervals by reducing friction and wear, while the cobalt-alloyed HSS-Co5 substrate increases red hardness for demanding materials. Together these features translate into longer tool life and fewer tool changes per shift. The right-hand cutting geometry supports conventional machining setups and keeps chip evacuation efficient, which is especially helpful when working with mixed batches of metals and polymers.

Streamlined handling for faster throughput

Each tool has a cylindrical shank for secure clamping in standard tool holders and is supplied in a compact plastic cassette for immediate workshop deployment. The size range covers the most common countersinking diameters from 6.3 to 20.5 mm, reducing the need for multiple specialised tools. The set format simplifies inventory management and speeds up tool selection at the bench, improving overall workshop efficiency.

Industry-compatible results across materials

Designed for use with stainless steel V2A, structural steel, aluminium and plastics, the set balances toughness and cutting performance to handle mixed-production workloads. The combination of material choice and coating means the cutters resist edge chipping when encountering harder workpieces, while still delivering a clean finish on softer substrates. The set is therefore suitable for maintenance shops, toolrooms and production lines requiring reliable, standardised countersinking.

For reliable, long‑lasting countersinking choose the Ruko ULTIMATECUT 4S set — contact Metav Werkzeuge for application advice and rapid supply from Emmerich: info@metav-werkzeuge.com / +49 2822 7131930

Technical data

• Article number: 4000605562NW
• Label: Kegelsenkersatz 90Grad ULTIMATECUT 4S 6,3-20,5mm HSS-Co5
• Packaging unit: 1

Facts

• Cutting angle: 90°
• Size range: 6.3–20.5 mm
• Material: HSS-Co5 (cobalt alloy)
• Standard: DIN 355
• Shank: cylindrical
• Cutting direction: right-hand
• Coating: RUnaTEC coating

Special features

• Suitable for stainless steel V2A
• Suitable for structural steel
• Suitable for aluminium
• Suitable for plastics
• Right-hand cutting geometry
• Supplied in plastic cassette

FAQ

What materials can be countersunk with this set? The Ruko ULTIMATECUT 4S countersink set is suitable for stainless steel V2A, structural steel, aluminium and various plastics according to the product specification.

What does HSS‑Co5 mean for performance? HSS‑Co5 indicates high‑speed steel with 5% cobalt, giving the cutters improved heat resistance and edge stability under elevated cutting temperatures.

How does the RUnaTEC coating help in daily use? The RUnaTEC coating reduces friction and wear, extending tool life and maintaining consistent cutting performance in the Ruko ULTIMATECUT 4S set.

Are the cutters compatible with standard tool holders? Yes; the cylindrical shank design is compatible with standard chucks and holders commonly used in workshops and production machines.

Does the set comply with any standardised geometry? The cutters follow DIN 355 geometry, ensuring predictable 90° chamfers and interchangeability within industrial processes.

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