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

The combination of RUnaTEC coating and HSS construction ensures prolonged tool life and consistent chamfer quality for demanding workshop applications; the 90° geometry to DIN 355 and cylindrical shank support reliable fit and repeatable results. Order the set directly via Metav Werkzeuge or contact the consultants for tailored technical advice.

ULTIMATECUT 4S 90° Countersink Set, HSS, RUnaTEC coating (6.3–20.5 mm) by Ruko

A ULTIMATECUT 4S 90° countersink set engineered for precision chamfering and deburring across stainless steel, structural steel, aluminium and plastics

• RUnaTEC coating for extended tool life
• HSS for stainless steel, structural steel, aluminium
• 90° geometry compliant with DIN 355
• Cylindrical shank, right-hand cutting
• Supplied in robust plastic case

Reliable chamfers with DIN‑compliant geometry

The set delivers repeatable 90° chamfers that meet the dimensional expectations of fastening and countersinking tasks. The DIN 355 reference indicates an industry-recognised profile, which simplifies planning for production or repair work and reduces trial-and-error on first runs. Operators benefit from a consistent seat for flush countersunk screws and clean edge preparation; this reduces rework and improves joint quality. The combination of defined geometry and stable cutting behaviour supports efficient cycle times in both single-item workshops and small-series production.

Longer uptime thanks to advanced surface treatment

Each tool in the range is treated with the RUnaTEC coating, a finish that reduces friction and improves wear resistance under continuous use. When paired with high-speed steel (HSS) substrate, the coating extends time between tool changes and preserves cutting-edge geometry when working with tougher materials. For procurement and process planning this means fewer interruptions for tool replacement, lower consumable turnover and a more predictable maintenance cadence—advantages that translate directly into cost-efficiency and higher overall output.

Versatile material compatibility for mixed workloads

The cutters are specified for a broad set of materials: stainless steel V2A, structural steel, aluminium and a range of plastics. The right-hand cutting geometry and robust HSS composition deliver dependable chip control and surface finish across these substrates. For users handling mixed batches—components in aluminium paired with stainless fastenings, for example—the set reduces the need to change to different tool types, streamlining workflows and inventory. Practical guidance: HSS stands for high-speed steel, a material known for toughness and edge retention at typical countersinking speeds.

Practical handling and safe storage

The tools come with a cylindrical shank that fits standard drill chucks and many quick-change holders, enabling straightforward integration into existing workshop equipment. The set is supplied in a robust plastic case, designed to protect cutting edges during transport and storage while keeping sizes organised for rapid selection. This approach to packaging supports safer handling, lowers the risk of accidental damage and speeds up job setup—particularly valuable where tool changes must be completed quickly between operations.

For personalised selection guidance or to arrange supply of the Ruko ULTIMATECUT 4S countersink set, contact Metav Werkzeuge in Emmerich at info@metav-werkzeuge.com or by phone on +49 2822 7131930 for prompt, expert advice and workshop-oriented recommendations.

Technical data

• Article number / SKU: 4000605564NW
• Name: Kegelsenkersatz 90Grad ULTIMATECUT 4S 6,3-20,5mm HSS RUnaTEC
• Packaging unit: 1

Facts

• Diameter range: 6.3–20.5 mm
• Geometry: 90°
• Standard: DIN 355
• Material: HSS

Special features

• Coating: RUnaTEC coating for longer service life
• Shank: cylindrical shank
• Cutting direction: right-hand cutting
• Material suitability: stainless steel V2A, structural steel, aluminium, plastics
• Packaging: plastic case

FAQ

What materials can be processed with this countersink set?
The Ruko ULTIMATECUT 4S countersink set is suitable for stainless steel V2A, structural steel, aluminium and plastics, as specified in the product description.

Does the set comply with any standardised geometry?
Yes, the 90° profile follows DIN 355, ensuring a recognised countersink geometry for common screw types and engineering applications.

How does the RUnaTEC coating benefit workshop use?
The RUnaTEC coating reduces friction and wear, extending time between tool changes and maintaining cutting performance under continuous use.

Can the cutters be used in standard drill chucks?
Yes, the cylindrical shank is compatible with standard drill chucks and many quick-change holders for convenient integration.

Is the set provided with protective storage?
The set is supplied in a robust plastic case to protect edges, keep sizes organised and support safe handling during transport and storage.

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