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

High-performance HSS‑Co5 countersinks with RUnaTEC coating deliver durable, consistent 90° chamfers and reduced regrinding intervals; ideal for both production runs and workshop repairs. Benefit from DIN 355 conformity and compact storage in a plastic case. Order the set directly via Metav Werkzeuge or consult our specialists for application-specific guidance.

ULTIMATECUT 4S Countersink set 90° – HSS‑Co5 with RUnaTEC coating

The ULTIMATECUT 4S countersink set is a precision 90° chamfering kit designed for reliable deburring and countersinking across metals and plastics in industrial and workshop environments

• RUnaTEC coating for extended tool life
• Conforms to DIN 355 standard
• 90° countersink 6.3–20.5 mm range
• Cylindrical shank, right-hand cut, plastic case

Longer runtime through advanced coating

The set combines HSS‑Co5 substrate with the RUnaTEC surface finish to give a measurable increase in tool life and wear resistance. Cobalt-alloy high-speed steel (HSS‑Co5) retains hardness at elevated cutting temperatures, so the cutters keep geometry longer under demanding conditions. The coating reduces friction and heat generation, which translates into longer service life and fewer tool changes during serial production—an important efficiency gain for batch work and repetitive chamfering tasks.

Precise, standard-compliant chamfers for consistent results

Manufactured to DIN 355, the cutters provide repeatable 90° chamfers that meet standard tolerances for countersinking operations. Compliance with this standard means predictable seating of fasteners and improved assembly quality. The geometry and sharpness of the cutting edges ensure consistent chamfers that minimise burr formation and reduce downstream finishing. For buyers seeking reliable repeatability in fastening preparation, this conformity supports quality assurance regimes.

Versatile across common workshop materials

This countersink set is suitable for a wide material spectrum: high-strength steel, stainless V2A, structural steel, aluminium and various plastics. The material compatibility stems from the cobalt-alloy core and coating combination, which handles tougher alloys while remaining effective on softer substrates. The right-hand cutting action produces clean chips and reduces the risk of smearing on non-ferrous metals. Selecting the appropriate spindle speed and feed will prolong tool life and improve surface finish on each material.

Designed for productivity and simple handling

Each cutter features a cylindrical shank for secure clamping in standard tool holders and a geometry optimised for fast material removal with low vibration. The set covers a practical diameter range of 6.3–20.5 mm, reducing the need to change tools when working through common hole sizes. Fewer interruptions and rapid changeovers support faster cycle times on production lines, while the cutter design simplifies manual workshop tasks by providing reliable, controllable cutting behaviour.

Clean storage and immediate readiness

Supplied in a sturdy plastic cassette, the set remains organised and protected from damage when not in use. Individual slots protect cutting edges and make inventory checks straightforward, supporting a tidy workshop layout and quicker tool selection. The compact storage solution also helps prevent accidental edge damage in busy environments, so cutters remain ready for precise chamfering without additional preparation.

For high-demand countersinking with extended tool life, choose the RUnaTEC-coated ULTIMATECUT 4S and contact Metav Werkzeuge for tailored technical advice and secure supply from Emmerich.

Technical data

• Article number: 4000605566NW
• Name: Kegelsenkersatz 90Grad ULTIMATECUT 4S 6,3-20,5mm HSS-Co5 RUnaTEC RUnaTEC
• Manufacturer: Ruko GmbH

Core specifications

• Angle: 90°
• Diameter range: 6.3–20.5 mm
• Material: HSS‑Co5
• Standard: DIN 355
• Shank type: cylindrical
• Cutting direction: right-hand
• Packaging unit: 1

Special features

• Coating: RUnaTEC for longer standtime
• Suitable for: high-strength steel, stainless V2A, structural steel, aluminium, plastics
• Packaging: plastic cassette

FAQ

What materials can be processed with this countersink set?
The ULTIMATECUT 4S set is designed for a broad range of materials, including high-strength steel, stainless V2A, structural steel, aluminium and various plastics, thanks to its HSS‑Co5 core and RUnaTEC coating.

What does conformity to DIN 355 mean for everyday use?
DIN 355 compliance ensures standardised geometry and tolerances for the 90° countersinks, producing repeatable chamfers that support secure fastener seating and consistent assembly quality.

How does the RUnaTEC coating affect tool life?
RUnaTEC reduces friction and heat at the cutting edge, which decreases wear and extends the interval between regrinding or replacement, improving overall uptime for serial operations.

Is the set suitable for use in production environments?
Yes—covering 6.3–20.5 mm and featuring a cylindrical shank and right-hand cut, the set supports efficient changeover and stable clamping for workshop and production applications.

How are the cutters supplied and stored?
The cutters are supplied in a plastic cassette that protects the edges, keeps the set organised and speeds tool selection during work preparation.

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