6.3-25mm 90° Countersink Set HSS-Co5 DIN 355 Cylindrical Shank Right-Hand Cutting, RUnaTEC Coating - Ruko GmbH

Take advantage of RUnaTEC coating and HSS‑Co5 construction for longer tool life and consistent chamfers; the 90° geometry and DIN 355 compliance deliver repeatable results across stainless steel, structural steel, aluminium and plastics. Order the set via Metav Werkzeuge or consult Metav's specialists for application advice.

ULTIMATECUT 4S Countersink Set 90° HSS‑Co5 — Ruko

The ULTIMATECUT 4S countersink set is a precision chamfering solution for workshop and production use, designed to prepare edges and deburr holes in stainless steel, structural steel, aluminium and plastics.

• RUnaTEC coating for extended life
• HSS‑Co5 for demanding materials
• 90° geometry for standard chamfers
• Cylindrical shank for secure clamping

Faster, repeatable chamfers for production workflows

The 90° geometry, made to DIN 355, ensures a consistent chamfer angle that reduces rework and speeds up downstream assembly. These countersinks provide a standardised edge for common fastening and finishing tasks, helping to maintain cycle times in small-batch and serial production. The combination of precise tool geometry and high‑quality steel yields a reliable cutting action that lowers the likelihood of burrs and misfits, thereby improving overall throughput and part quality.

Built for longevity to minimise downtime

Manufactured from HSS‑Co5 (high‑speed steel with cobalt) and finished with a RUnaTEC coating, the set resists wear in tougher materials and at elevated cutting temperatures. HSS‑Co5 offers improved hot hardness compared with conventional high‑speed steels, which means the cutters retain an effective cutting edge for longer when working stainless steel or alloyed steels. The coating further reduces friction and helps to prevent built‑up edge formation, extending tool life and reducing the frequency of tool changes — a clear cost‑efficiency in workshop routines.

Easy integration with existing tooling and quick set‑up

Each cutter features a cylindrical shank compatible with standard collets and chucks, simplifying changeovers and ensuring concentric clamping. The right‑hand cutting geometry provides predictable chip flow for conventional machining direction. For workshop technicians and maintenance teams, the familiar shank design and standardised angle translate into quick set‑up, fewer alignment checks and more consistent hole preparation across different machines and jigs.

Practical storage, clear standards and material range

Supplied in a plastic case for organised storage and transport, the set keeps cutters protected and accessible at the bench. The tools are suitable for stainless steel (V2A), structural steel, aluminium and plastics, offering versatility for mixed‑material jobs. Conformity with DIN 355 provides a recognised reference for quality and interchangeability. For operations seeking both everyday reliability and the reassurance of tested standards, this countersink set provides measurable improvements to finishing processes.

For workshop supply and expert guidance, obtain the Ruko ULTIMATECUT 4S set via Metav Werkzeuge — contact Metav Werkzeuge at info@metav-werkzeuge.com or call +49 2822 7131930 for tailored advice and order support.

Technical Data

• Article number: 4000605561NW
• SKU: 4000605561NW
• Label: Kegelsenkersatz 90Grad ULTIMATECUT 4S 6,3-25,0mm HSS-Co5
• Packaging unit: 1

Facts

• Diameter range: 6.3–25.0 mm
• Angle: 90°
• Standard: DIN 355

Special features

• RUnaTEC coating for longer stand time
• Material: HSS‑Co5 (high‑speed steel with 5% cobalt)
• Cylindrical shank
• Right‑hand cutting
• Suitable for stainless steel V2A, structural steel, aluminium, plastics
• Packaging: plastic case
• Brand: Ruko

FAQ

What materials can be machined with this countersink set?
The Ruko ULTIMATECUT 4S set is suitable for stainless steel (V2A), structural steel, aluminium and various plastics, as stated in the technical details.

How does the RUnaTEC coating benefit workshop operations?
The RUnaTEC coating reduces friction and wear, which extends tool life and helps to keep cutting performance stable over longer runs.

What does HSS‑Co5 mean for cutting performance?
HSS‑Co5 denotes high‑speed steel alloyed with approximately 5% cobalt; this improves hot hardness and wear resistance, making the cutters more effective on tougher steels.

Is the geometry suitable for standard chamfering tasks?
Yes — the 90° angle conforms to DIN 355 and delivers a standard chamfer profile commonly required for countersinking and clearance for fasteners.

Which article should be ordered to obtain this set?
Order the set using article number 4000605561NW (SKU 4000605561NW) when requesting the Ruko ULTIMATECUT 4S countersink set.

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