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

Take advantage of the combination of 90° geometry, HSS cutting edges and a durable RUnaTEC coating for precise, repeatable countersinking across steel, aluminium and plastics; order the set directly via Metav Werkzeuge or request consultation from Metav's specialists for technical advice.

ULTIMATECUT 4S 90° Countersink Set 6.3–20.5 mm HSS by Ruko

The ULTIMATECUT 4S 90° Countersink Set is a high-performance HSS kit designed for clean deburring and standard-angle chamfering in workshop and industrial maintenance applications.

• RUnaTEC coating for extended tool life
• DIN 355 specification compliant
• 90° angle for standard countersinking
• Cylindrical shank with right-hand cut

Reliable 90° geometry for consistent assembly results

The 90° countersink geometry ensures reproducible chamfers that match common fastener heads and countersink standards, reducing assembly time and alignment issues. Conformity with DIN 355 guarantees standardised dimensions and consistent runout tolerances, which simplifies quality control and inspection processes in production and maintenance environments. With visibly uniform results, the kit supports efficient joining operations and reduces rework caused by irregular countersinks.

Extended service life through RUnaTEC coating and HSS construction

Manufactured from HSS, the set offers elevated hot hardness and wear resistance compared with softer tool steels, making it suitable for continuous use on structural materials. The RUnaTEC coating further extends tool life by improving surface hardness and reducing built-up edge, which translates into longer intervals between tool changes and lower operating costs. The right-hand cutting geometry promotes predictable chip flow and stable cutting forces, helping to maintain surface integrity on workpieces.

Practical kit design for workshop productivity

Covering a diameter range of 6.3–20.5 mm, the set addresses common countersinking needs without resorting to single-size purchases, reducing tool changes and inventory complexity. Each insert is supplied with a cylindrical shank for secure gripping in standard chucks and holders, and the components are stored in a plastic case for organised transport and straightforward tool selection. The compact kit format keeps downtime to a minimum and supports mobile maintenance tasks as well as benchwork.

Material compatibility and safe application guidance

The cutting geometry and material selection make this set suitable for construction steel, aluminium and plastics, as indicated by the manufacturer's specifications. Right-hand cutting and the HSS substrate provide a balance between cutting capability and chip evacuation for these materials; for hardened or exotic alloys, tool selection should follow material-specific guidance. The set is intended for conventional drilling and countersinking equipment with appropriate speeds and feed rates compatible with HSS tooling.

For durable, standards-compliant countersinking, request the Ruko ULTIMATECUT 4S from Metav Werkzeuge — contact Metav Werkzeuge in Emmerich for product advice at info@metav-werkzeuge.com or +49 2822 7131930

Technical data

• Article number: 4000605560NW
• Product name: ULTIMATECUT 4S 90° Countersink Set
• Brand: Ruko GmbH
• Packaging unit: 1

Facts

• Angle: 90°
• Diameter range: 6.3–20.5 mm
• Standard: DIN 355

Special features

• Material: HSS
• Coating: RUnaTEC coating
• Shank type: cylindrical shank
• Cutting direction: right-hand cut
• Suitable for: construction steel, aluminium, plastics
• Packaging: plastic case

FAQ

Is the countersink set suitable for aluminium work?
Yes. The ULTIMATECUT 4S set is specified for use on aluminium and delivers clean chamfers when run at speeds and feeds appropriate for aluminium with HSS tooling.

What does the RUnaTEC coating provide?
The RUnaTEC coating increases surface hardness and reduces adhesion of chips, extending the service life of the HSS cutting edges and improving wear resistance during repetitive countersinking.

Does the kit include different sizes for varied fastener heads?
The set covers a diameter range of 6.3–20.5 mm, providing options for common fastener head sizes and reducing the need for multiple individual cutters.

Is the set compliant with industry standards?
Yes. The countersinks conform to DIN 355, ensuring standardised geometry and dimensional reliability for industrial applications.

How is the tool stored and transported?
Components are supplied in a compact plastic case that keeps cutters organised and protected during storage and transport.

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