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

Robust workshop performance meets extended tool life: the combination of HSS construction, RUnaTEC coating and a 90° geometry ensures precise chamfering and reliable deburring in steel, aluminium and plastics. Supplied in a protective plastic case with a cylinder shank, the set supports efficient machining and tidy storage. Order the ULTIMATECUT set directly via Metav Werkzeuge or request application advice from the consultants.

ULTIMATECUT 4S Countersink Set 90° – HSS, RUnaTEC coating (Ruko)

ULTIMATECUT 4S is a 90° countersink set engineered for precise chamfering and deburring across steel, aluminium and plastic components

• RUnaTEC coating for longer tool life
• DIN 355 standard-compliant
• 90° taper for precise countersinking
• HSS suitable for steel, aluminium, plastics

Reliable performance for workshop production

Made from HSS, this countersink set delivers high toughness and temperature resistance for demanding machining tasks. High-speed steel stands up to repetitive use and resists deformation under load, which translates into consistent geometry and fewer rejects. Compliance with DIN 355 guarantees interchangeability and predictable results when used in production environments. The right‑hand cutting geometry facilitates standard machining directions and predictable chip flow, reducing cycle-time variation and supporting reproducible hole preparation.

Longer tool life through advanced RUnaTEC coating

The integrated RUnaTEC coating reduces friction at the cutting edge and minimises abrasive wear, meaning longer intervals between regrinds or replacements. Coatings alter the surface interaction between tool and workpiece: by lowering adhesion and heat transfer, the cutting edge maintains its profile for extended periods. For workshops aiming to lower tool consumption and setup disruptions, this coating provides a measurable improvement in lifetime and process stability while preserving the quality of the chamfered finish.

Practical design for secure clamping and organised storage

A cylinder shank ensures secure clamping in standard tool holders and quick-change systems, improving concentricity during countersinking. The set is supplied in a plastic case, which protects the cutters during transport and keeps tools organised at the bench—reducing time spent searching for the right size and preventing accidental damage. These design choices help to sustain machine uptime and simplify tool handling in busy production and maintenance shops.

Clear advantages in assembly and finishing operations

A 90° countersink prepares screw seats and bevels holes to accommodate flat‑head fasteners, resulting in flush assemblies and reduced stress concentrations. The set performs reliable deburring, leaving edges safer to handle and improving the visual and functional finish of parts. Suitable for general steel, aluminium and plastic workpieces, these tools support common workshop tasks such as fitting, repair and prototype finishing while reducing the need for secondary manual deburring operations.

For a precise, longer‑lasting countersinking solution from Ruko, contact Metav Werkzeuge to confirm suitability for specific materials and to arrange supply or expert advice via info@metav-werkzeuge.com or +49 2822 7131930

Technical data

• Article number: 4000605560NW
• Description: Countersink set 90° ULTIMATECUT 4S HSS
• Manufacturer: Ruko GmbH
• Packaging unit: 1

Facts

• Angle: 90°
• Standard: DIN 355
• Material: HSS
• Cutting direction: Right‑hand
• Shank: Cylinder shank

Special features

• RUnaTEC coating for extended tool life
• Suitable for steel, aluminium and plastics
• Supplied in plastic case

FAQ

What materials is the countersink set suitable for?
The ULTIMATECUT 4S countersink set is suitable for steel, aluminium and various plastics, making it versatile for common workshop applications.

Does the set conform to any industry standards?
Yes, the cutters comply with DIN 355, ensuring standard dimensions and interchangeability for industrial use.

What benefit does the RUnaTEC coating provide?
The RUnaTEC coating on the ULTIMATECUT 4S reduces friction and wear, which extends tool life and maintains cutting performance over longer runs.

How is the set supplied and stored?
The set is supplied in a protective plastic case, providing organised storage and safe transport between the toolroom and the machine.

Is the shank type suitable for quick changes and standard chucks?
The cylinder shank design offers secure clamping in standard chucks and many quick‑change systems, improving concentricity and handling.

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