6.3-25.0mm 90° Countersink Set HSS Right-Cutting Zylindrical Shank DIN 355 RUnaTEC Coating - Ruko GmbH

Take advantage of a proven combination of high cutting precision and extended tool life through the RUnaTEC coating while maintaining straightforward workshop handling; order or request expert advice via Metav Werkzeuge for reliable supply and technical guidance.

ULTIMATECUT 4S Countersink Set 90° (6.3–25.0 mm) by Ruko — HSS with RUnaTEC coating

The ULTIMATECUT 4S countersink set is a workshop-grade collection for producing precise 90° countersinks across a broad diameter range, suitable for mixed-material applications in production and maintenance

• RUnaTEC coating extends tool life
• Conforms to DIN 355 standard
• Wide range 6.3–25.0 mm countersinks
• Robust HSS for steels and plastics

Precise geometry and proven material compatibility

The ULTIMATECUT 4S countersink set is manufactured from HSS to ensure a balance of toughness and edge retention across common workshop substrates. The 90° cutting angle follows DIN 355, providing standardised countersink geometry for consistent fastener seating and repeatable joint quality. Compatibility with stainless steel V2A, structural steel, aluminium and plastics is achieved through a combination of material grade and flute design, which moderates chip evacuation and heat generation. For purchasers seeking predictable machining results, this means fewer reworks and more reliable assembly fits.

Extended uptime and predictable performance in production

The RUnaTEC coating applied to these countersinks reduces wear and friction, translating directly into longer service intervals and lower tool consumption during batch work. Right-hand cutting geometry and the flute profile are optimised for controlled chip formation, which helps maintain surface finish and dimensional accuracy in repeated operations. The resulting efficiency gains are tangible: reduced downtime for tool changes and fewer interrupted production cycles. For workshops where throughput and process stability matter, the set offers a clear improvement in operational economy without sacrificing cut quality.

Practical design for workshop handling and storage

Each tool features a cylindrical shank for secure clamping in common tool holders and drills, simplifying tool changes and ensuring concentricity during use. The range from 6.3–25.0 mm covers typical countersinking needs, reducing the need to source multiple individual tools. Supplied in a plastic case, the set is easy to store and transport, protecting cutting edges and helping maintain organisation at the bench. The right-hand cutting orientation and compliance with DIN standards make the set suitable for both maintenance tasks and serial production environments that demand consistency and clear tool traceability.

For reliable countersinking solutions backed by workshop-grade quality and extended tool life from Ruko, engage Metav Werkzeuge for procurement and technical consultation — contact info@metav-werkzeuge.com or call +49 2822 7131930 to discuss suitability and delivery options.

Technical Data

• Article number: 4000605563NW
• Designation: Countersink set 90° ULTIMATECUT 4S 6.3–25.0 mm HSS
• Manufacturer: Ruko GmbH

Data

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

Special features

• RUnaTEC coating
• Material: HSS
• Suitable for: stainless steel V2A; structural steel; aluminium; plastics
• Packaging: plastic case

FAQ

What materials can be machined with this countersink set?
The ULTIMATECUT 4S countersink set is made of HSS and is suitable for stainless steel V2A, structural steel, aluminium and a range of plastics, offering versatile application across typical workshop materials.

What size range and angle does the set cover?
The set covers diameters from 6.3 to 25.0 mm and produces a 90° countersink, complying with DIN 355 for standardised seating geometry.

Does the set include a surface coating to extend life?
Yes — the tools are finished with a RUnaTEC coating that reduces wear and friction, extending service life under normal workshop conditions.

How are the tools supplied and handled in the workshop?
Tools are supplied in a protective plastic case and feature cylindrical shanks for secure clamping in standard tool holders and drill chucks.

Which SKU should be referenced when ordering or enquiring?
Reference SKU 4000605563NW when enquiring about the ULTIMATECUT 4S countersink set to ensure accurate identification and supply.

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