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

Combining HSS‑Co5 construction with the RUnaTEC coating yields longer service life and consistently precise 90° chamfers; benefit from reduced tool changes and predictable process reliability — order the Ruko ULTIMATECUT 90° countersink set directly via Metav Werkzeuge or consult our specialists for procurement and specification support.

Ruko ULTIMATECUT 90° countersink set 4S (6.3–20.5 mm) — HSS‑Co5, RUnaTEC coating

The Ruko ULTIMATECUT 90° countersink set is a compact set for precision chamfering and deburring in workshop and production environments, designed for use across steels, stainless and non‑ferrous materials

*RUnaTEC coating for extended tool life *HSS‑Co5 for high‑strength steels and stainless *90° geometry for standard chamfers and countersinks *Supplied in secure plastic cassette

Consistent chamfers for predictable assembly

The set delivers repeatable chamfer geometry thanks to the 90° point angle and the conformity to DIN 355, ensuring that countersinks meet standard assembly requirements and fitment tolerances. Built as a countersink set, the cutters are ground for stable cutting behaviour which reduces rework. Where bolt seating and neat edges matter, the precise geometry supports consistent screw engagement and avoids part rejection caused by irregular chamfers. The design therefore contributes directly to process stability and measurable quality improvements on the shop floor.

Lower operating costs through extended tool life

Manufactured in HSS‑Co5 and finished with the RUnaTEC coating, the cutters combine cobalt‑alloy high‑speed steel strength with a wear‑resistant surface to extend lifetime under demanding conditions. The result is fewer tool changes and less machine downtime, which improves throughput and lowers unit manufacturing costs. For operations working with mixed batch sizes, the improved durability translates into a tangible return on investment by stretching tool life between regrinds or replacements and maintaining cutting performance under high loads.

Versatile material compatibility for multi‑purpose use

Engineered for broad applicability, the set is suitable for high‑strength steels, stainless steel V2A, aluminium and plastics, with right‑hand cutting geometry for stable chip evacuation. The cylindrical shank design ensures compatibility with standard drill chucks and tool holders, simplifying integration into existing tool sets. Using a cobalt‑enriched HSS grade means the cutters retain edge integrity when tackling tougher alloys, making the set a practical choice for job shops and maintenance departments handling varied materials.

Practical kit format for organised workflows

The four‑piece range covering the diameter range 6.3–20.5 mm is supplied in a robust plastic case, keeping tools organised and protected between jobs. The compact kit reduces search times and supports efficient tool change routines, while the labelled cassette aids inventory control. For production lines that require rapid access to the correct countersink size, the ready‑to‑use format supports smoother operations and reduces process friction, contributing to overall shopfloor efficiency.

For procurement, technical clarification or to discuss application suitability for the Ruko ULTIMATECUT 90° countersink set (SKU 4000605566NW), contact Metav Werkzeuge — our advisers can provide specification support and delivery options via info@metav-werkzeuge.com or +49 2822 7131930.

Technical data

• Article number: 4000605566NW
• Item: ULTIMATECUT 90° countersink set 4S 6.3–20.5 mm
• Manufacturer: Ruko GmbH
• Packaging unit: 1
• Packaging: plastic case

Core specifications

• Angle: 90°
• Diameter range: 6.3–20.5 mm
• Standard: DIN 355
• Material: HSS‑Co5
• Coating: RUnaTEC
• Cutting direction: right‑hand
• Shank: cylindrical

Materials & special features

• Suitable for high‑strength steels
• Suitable for stainless steel V2A
• Suitable for construction steel
• Suitable for aluminium
• Suitable for plastics
• Right‑hand cut
• Supplied in plastic cassette

FAQ

What diameter range is covered by the set?
The set covers a diameter range of 6.3–20.5 mm and is delivered as a compact kit, making size selection straightforward for typical countersinking tasks with the Ruko ULTIMATECUT 90° countersink set (SKU 4000605566NW).

Is the set suitable for stainless steel?
Yes, the cutters are made from HSS‑Co5 and are suitable for stainless steel V2A; the material choice and RUnaTEC coating help maintain cutting edge life when working stainless alloys.

Can these countersinks be used in handheld drills?
The cylindrical shank design is compatible with standard drill chucks, so the cutters can be used in both handheld drills and machine spindles provided the chuck secures the shank correctly.

Does the product conform to an established standard?
The geometry of the set complies with DIN 355, ensuring standardised chamfer angles and repeatable results for assembly and seating applications.

What is the main benefit of the RUnaTEC coating?
The RUnaTEC coating increases wear resistance and extends tool life, reducing the frequency of replacements and contributing to more reliable process output with the Ruko ULTIMATECUT set.

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