19mm 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 secure clamping for consistent, burr-free chamfers — order directly via Metav Werkzeuge or consult the Metav team for tailored advice.

RUKO ULTIMATECUT 4S Countersink (HSS, 90° D 19 mm)

The ULTIMATECUT 4S countersink is a high-performance HSS tool, RUnaTEC-coated and optimised for fast, quiet, burr-free countersinking of steel in both stationary machines and manual operations.

• RUnaTEC-coated HSS for increased tool life
• 90° countersink with 4 flutes for clean chamfers
• Shank with three flats; secure clamping
• Up to 50% faster countersinking in steel

Faster, measurable gains in production flow

The combination of HSS substrate and RUnaTEC coating delivers a tangible performance uplift: reduced friction means lower feed force and extended tool life, while the geometry enables up to 50% faster countersinking compared with conventional designs. These effects translate into lower operator effort in manual use and shorter cycle times on production machinery. The stated feed recommendation — 0.19 mm/rev at up to 800 N in steel — provides a reliable baseline for process planning and helps estimate throughput improvements.

Consistent chamfer quality and quiet running

Engineered with 4 flutes and a 90° cutting angle, the cutter produces an optimal countersink finish with minimal rattle marks. The right-hand cutting geometry and flute design ensure efficient chip evacuation, which preserves surface quality and reduces rework. The shank with three flats improves anti-slip clamping in keyed chucks or collet systems, so set-up is quicker and the run remains extremely quiet, supporting a safer and more comfortable working environment.

Designed for both manual and stationary applications

Specifically specified for use in steel and optimised for both hand-fed and machine-mounted operations, the tool delivers best performance in stationary and manual areas. The construction supports a higher number of countersinks per edge — in practice up to three times more — which reduces tool changes and downtime. Technical users will value the adherence to DIN 335 C, making integration into existing tool lists straightforward and predictable.

For reliable procurement and expert advice on RUKO cutting tools, contact Metav Werkzeuge — fast supply from Emmerich and advice by phone or e‑mail are available to ensure the right tool choice for the application.

Technical Data

• Article number: 4000605553NW
• SKU: 4000605553NW
• Product name: ULTIMATECUT 4S Countersink
• Packaging unit: 1

Facts

• Diameter: 19 mm
• Countersink angle: 90°
• Cutting edges: 4
• Feed in steel (≤ 800 N): 0.19 mm/rev
• Standard: DIN 335 C

Special features

• Material: HSS
• Coating: RUnaTEC
• Shank: with 3 flats
• Cutting direction: right-hand cutting
• Application: optimised for steel
• Performance notes: lower feed force, quieter run, improved surface finish

FAQ

What types of materials is this countersink suitable for?
The RUKO ULTIMATECUT 4S countersink is specified and optimised for use in steel, delivering clean chamfers and reliable tool life under the recommended cutting parameters.

How does the RUnaTEC coating benefit tool life and performance?
The RUnaTEC coating reduces friction and heat at the cutting edge, which extends the life of the HSS cutter and enables faster cutting with less feed force compared with uncoated equivalents.

Is the shank compatible with standard chucks and collets?
Yes — the shank with three flats provides secure clamping for both keyed chucks and collet systems, reducing slippage and improving concentricity during countersinking.

What cutting data should be used as a starting point?
A practical baseline is the stated feed of 0.19 mm/rev at up to 800 N in steel; adjust feeds and speeds according to machine rigidity and workpiece setup.

Does the tool support manual as well as machine use?
The ULTIMATECUT 4S is designed for both manual and stationary applications, offering reduced operator effort in hand use and consistent results in machine-mounted scenarios.

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