16.5mm Countersink UltimateCut 4-Flute HSS RUnaTEC Coated 90° Shank With 3 Flats - Ruko GmbH

Take advantage of the combination of high cutting performance, reduced feed force and reliable clamping for faster, cleaner chamfering in both workshop and production. Order the countersink directly via Metav Werkzeuge or contact their consultants for tailored technical advice.

RUKO ULTIMATECUT 4S 90° Countersink – HSS, RUnaTEC coating, Ø16.5 mm

The RUKO ULTIMATECUT 4S is a 90° high-speed steel countersink with RUnaTEC coating, designed for fast, low-force chamfering and dependable finish quality in both stationary and manual operations.

• HSS with RUnaTEC coating for longer life
• Four-flute design for smooth cutting
• Up to 50% faster countersinking
• Suitable for manual and stationary use

Increase throughput with lower feed force and consistent cycle times

The ULTIMATECUT series delivers measurable productivity gains by lowering the required cutting effort. The HSS body combined with the RUnaTEC coating reduces friction and heat, which means feed forces fall and cycle times shrink—performance data shows feeding in steel up to 800 N at 0.18 mm/rev. For production environments this translates into fewer tool changes and a steadier output rate, while workshops benefit from easier hand-held operation without loss of finish quality.

Achieve a smooth, chatter‑free countersink and reliable clamping

The four‑flute geometry produces a refined cutting action that minimises vibration and leaves an optimal countersink surface without ratter marks. The countersink conforms to DIN 335C and features a shaft with three flats, ensuring secure clamping and repeatable concentricity in chucks and collets. Right‑hand cutting and the balanced flute design contribute to an extremely quiet operation, reducing noise and improving operator comfort during repetitive tasks.

Versatile tool life and consistent finish across work scenarios

Built for both workshop hand tools and stationary machines, this countersink provides up to 3× more countersinks per tool compared with comparable designs and can be up to 50% faster in penetration. The robust construction and coating increase wear resistance while preserving edge geometry, so fewer regrinds or replacements are necessary. The result is a dependable chamfering solution that supports cost-effective production and predictable part quality.

Choose the RUKO ULTIMATECUT 4S via Metav Werkzeuge for fast, low-force countersinking and expert purchasing support; contact Metav Werkzeuge by e‑mail at info@metav-werkzeuge.com or by phone on +49 2822 7131930 for precise advice and supply options

Technical data

• Article number: 4000605552NW
• SKU / UID: 4000605552NW
• Label: Kegelsenker ULTIMATECUT 4S DIN 335C 90Grad D.16,5mm HSS RUnaTEC Z.4 RUKO
• Packaging unit: 1

Facts

• Diameter: 16.5 mm
• Countersink angle: 90°
• Flutes: 4
• Feed in steel (up to 800 N): 0.18 mm/rev

Special features

• Material: HSS
• Coating: RUnaTEC
• Standard: DIN 335C
• Shaft with three flats for secure clamping
• Right‑hand cutting
• Designed for stationary and manual use
• Reduced feed force required
• Up to 3× more countersinks per tool
• Up to 50% faster countersinking
• Extremely quiet running, optimal countersink finish

FAQ

What materials is this countersink intended for?
The RUKO ULTIMATECUT 4S is specified for use on steel; the tool’s geometry and coating are optimised for reliable chamfering in steel workpieces.

What feed rate should be used for safe operation?
For cutting steel at forces up to 800 N the recommended feed is 0.18 mm/rev, as stated for the ULTIMATECUT 4S to balance surface quality and tool life.

How does the RUnaTEC coating improve performance?
The RUnaTEC coating on the ULTIMATECUT 4S reduces friction and heat at the cutting edge, extending service life and enabling higher feeds with a quieter run.

Will the shaft fit standard chucks and collets?
The shaft with three flats on the ULTIMATECUT 4S provides secure clamping in standard chucks and many collet systems, improving concentricity and repeatability.

Is this countersink suitable for hand-held drilling operations?
Yes; the tool is designed for both manual and stationary use, delivering stable, low‑force cutting that suits hand-held work as well as machine mounting.

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