10.4mm Countersink UltimateCut 4-Flute HSS RUnaTEC Coated 90° Shank With 3 Flats, DIN 335C - Ruko GmbH

Take advantage of the combination of high cutting performance, reduced feed force and reliable clamping, delivering faster, cleaner countersinks in both stationary and manual operations; order the tool directly via Metav Werkzeuge or consult our specialists for application advice.

Countersink ULTIMATECUT 4S — 90° HSS, RUnaTEC-coated, 4 flutes (RUKO)

The ULTIMATECUT 4S countersink is a four‑flute, 90° conical countersink designed to produce clean, chatter‑free chamfers and countersinks in steel and general workshop materials, optimised for both machine and handheld use

• HSS with RUnaTEC coating for long life
• Four‑flute geometry for smooth cutting
• 90° angle for standard countersinking
• Shank with three flats for secure clamping

Higher throughput through engineered cutting geometry

The combination of HSS substrate and RUNaTEC coating in this tool reduces wear and maintains a sharp cutting edge, resulting in up to 50% faster countersinking cycles compared with standard countersinks. The four‑flute design distributes cutting forces evenly, which lowers required feed effort and enables a steadier feed in steel up to the stated load — specified as 0.13 mm/rev at workpiece forces up to 800 N. This translates into shorter cycle times and a more predictable process in production environments where efficiency matters.

Secure clamping and vibration‑free operation for a better surface

A shank with three flats ensures repeatable, slip‑free clamping in chucks and collets, while the flute geometry and precise land clearance minimise tool vibration. The result is an optimal countersink finish with no chatter marks and an extremely quiet run, which reduces the need for rework and improves component presentation after deburring. These mechanical advantages are particularly relevant when switching between stationary machines and manual tools, where consistency is essential.

Coating and material choices explained for robust performance

The tool’s RUNaTEC coating adds a hard, wear‑resistant surface that lowers adhesion of workpiece material and reduces notch wear at the cutting edges. Combined with HSS core material, the countersink sustains edge integrity under intermittent loads and typical workshop speeds. The specification to DIN 335C indicates industry‑standard geometry and tolerances for conical countersinks, simplifying tool selection and ensuring interchangeability with existing workflows and holders.

Practical benefits for day‑to‑day workshop and production use

Built for both stationary and manual applications, the countersink delivers fewer rejects and less operator fatigue through the need for significantly lower feed forces. The right‑hand cutting direction and the balanced flute profile make the tool suitable for diverse tasks from single‑piece manual finishing to repetitive production runs, while the improved life expectancy often means fewer tool changes and reduced machine downtime. Measurable gains in productivity—such as up to 3x more countersinks per tool in many cases—support a clear return on tool selection when integrated into a systematic production process.

For technical ordering and application guidance on the ULTIMATECUT 4S countersink, contact Metav Werkzeuge — email info@metav-werkzeuge.com or call +49 2822 7131930 for immediate support and supply from our Emmerich site

Technical data

• Article number: 4000605549NW
• SKU: 4000605549NW
• Designation: Countersink ULTIMATECUT 4S DIN 335C 90° Ø10.4 mm
• Manufacturer: Ruko GmbH
• Packaging unit: 1

Facts

• Diameter: 10.4 mm
• Angle: 90°
• Flutes: 4
• Feed in steel (up to 800 N): 0.13 mm/rev
• Standard: DIN 335C

Special features

• Material: HSS
• Coating: RUnaTEC
• Shank with three flats for secure clamping
• Right‑hand cutting
• Suitable for stationary and manual use
• Reduced feed force required
• Extremely quiet run and optimal countersink finish
• Up to 3x more countersinks; up to 50% faster countersinking

FAQ

What materials can be machined with this countersink?
The ULTIMATECUT 4S is made from HSS with a RUNaTEC coating and is intended for steel and typical workshop materials; the tool’s geometry and coating make it suitable for many standard countersinking tasks.

Can the tool be used in handheld drills as well as on machines?
Yes — the design supports both stationary and manual applications thanks to secure clamping via the shank with three flats and a flute profile that reduces vibration.

What does the DIN 335C designation mean for the countersink?
DIN 335C denotes the standard conical geometry and tolerances for 90° countersinks, ensuring compatibility with standardised fixtures and predictable cutting behaviour in production.

How does the RUnaTEC coating affect tool life?
The RUNaTEC coating increases wear resistance and reduces adhesion at the cutting edge, which typically extends tool life and maintains surface quality over a larger number of countersinks.

What is the recommended feed when countersinking steel?
A reference feed under steel loads up to 800 N is 0.13 mm/rev; actual feed rates should be adjusted according to machine rigidity and material grade.

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