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

Take advantage of RUnaTEC coating and HSS construction for longer runtimes and consistent results across stainless steel, aluminium and plastics; the DIN 355 geometry ensures predictable 90° countersinks while the robust cylindrical shank simplifies tool changes. Order the set directly via Metav Werkzeuge or consult Metav’s specialists for application advice.

ULTIMATECUT 4S 90° Countersink Set, HSS – 6.3–25.0 mm (Ruko)

The ULTIMATECUT 4S 90° countersink set is a workshop and production-grade solution for deburring, chamfering and preparing holes in mixed materials where consistent 90° seating and finish are essential.

• RUnaTEC coating for extended tool life
• Conforms to DIN 355 standard
• HSS: stainless steel, steel, aluminium, plastics
• Cylindrical shank, right‑hand cutting

Faster, more reliable countersinking across common materials

The ULTIMATECUT 4S set delivers a flexible diameter range of 6.3–25.0 mm, enabling fewer tool changes during batch work and reducing setup time. Manufactured from HSS, the cutters maintain edge stability when processing stainless steel V2A, structural steel, aluminium and plastics, so consistent chamfers and deburrs are achieved across mixed runs. This reliability translates into predictably uniform countersinks and a lower scrap rate, supporting smoother production flow and predictable cycle times.

Coating and geometry that reduce downtime

A hard-wearing RUnaTEC coating extends service intervals by improving wear resistance and reducing friction at the cutting edge, which in turn reduces heat build-up and the frequency of tool swaps. The cutters conform to DIN 355 and are ground to a precise 90° included angle for standard fastener seating. The right‑hand cutting geometry ensures stable chip formation in conventional drilling setups, helping to avoid chatter and rework—an important aspect for operations seeking immediate productivity gains and measurable cost-per-hole improvements.

Practical design for workshop use and easy handling

Each countersink features a cylindrical shank for compatibility with standard chucks and toolholders, facilitating rapid replacement during production. The set is supplied in a neat plastic case, providing organised storage and quick selection of the required size, which aids traceability and reduces downtime between operations. The combination of clear sizing and a compact case supports orderly workstations and faster changeovers in busy shops and small production lines.

Durable performance and traceable standards

Long-term economy arises from the combination of robust material choice, protective coating and standard-compliant geometry: fewer replacements, lower maintenance effort and reproducible results. The geometry and finish of the cutters support precision seating and minimise fastener tilt, improving assembly reliability. Purchasers also benefit from Metav’s established supply chain and quality filter in Emmerich, which underpins consistent product availability and the assurance of documented conformity for industrial purchasing.

For longer tool life and reliable countersinking, contact Metav Werkzeuge for availability of the Ruko ULTIMATECUT 4S and expert guidance via info@metav-werkzeuge.com or +49 2822 7131930

Technical data

• Article number: 4000605563NW
• Name: Countersink set 90° ULTIMATECUT 4S 6.3–25.0 mm, HSS
• Manufacturer: Ruko GmbH
• Packaging unit: 1

Facts

• Diameter range: 6.3–25.0 mm
• Angle: 90°
• Material: HSS
• Standard: DIN 355
• Shank: cylindrical
• Cutting direction: right‑hand

Special features

• RUnaTEC coating for extended service life
• Suitable for stainless steel V2A, structural steel, aluminium, plastics
• Packaged in plastic case
• Right‑hand cutting geometry

FAQ

What diameter range is covered by the set?
The countersink set covers sizes from 6.3 to 25.0 mm to accommodate a broad range of hole diameters.

Which materials can these countersinks process?
The Ruko ULTIMATECUT 4S set is specified for stainless steel V2A, structural steel, aluminium and plastics, enabled by the HSS material and coated finish.

What is the included angle of the cutters?
Each cutter is ground to a 90° included angle in line with common fastening requirements.

Does the set meet an established industrial standard?
Yes—the tools conform to DIN 355, ensuring consistent geometry and interchangeability for industrial applications.

How are the cutters supplied for storage and transport?
The set is supplied in a plastic case for organised storage and easy identification of individual sizes.

What does the RUnaTEC coating provide?
The RUnaTEC coating increases wear resistance and reduces friction, extending tool life and improving performance under demanding conditions.

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