16.5mm Countersink 90° HSS 4-Flute RUnaTEC Coated, Right-Hand Shank With Three Flats - Ruko GmbH

Take advantage of the combination of durable HSS construction, RUnaTEC coating and optimised four‑flute geometry for faster, cleaner 90° chamfering in steel — ideal for both benchtop machines and manual countersinking. Order directly via Metav Werkzeuge or consult the team for application advice.

RUKO ULTIMATECUT 4S countersink — HSS, RUnaTEC-coated, 90° Ø16.5 mm

The ULTIMATECUT 4S countersink is a high-performance cutting tool for producing precise 90° chamfers and deburring in steel, engineered for both stationary machining and manual use.

• HSS with RUnaTEC coating for longer tool life
• Four-flute geometry for smooth, quiet cutting
• 90° countersink angle for standard chamfering
• Shank with three flats for secure clamping

Faster yields and lower cutting forces for production

The ULTIMATECUT 4S combines HSS substrate with a RUnaTEC surface treatment to reduce friction and wear, delivering up to 50% faster countersinking and up to 3× more operations between tool changes. The reduced friction translates directly into lower feed force, which is especially beneficial in handheld or light‑duty setups where control and stability are limited. These measurable performance gains make the tool a rational choice when throughput and tool longevity are priorities.

Geometry engineered for a consistent, chatter‑free finish

A four‑flute cutter profile and a 90° countersink angle produce an even material removal rate and a clean chamfer without ratter marks. The right‑hand cutting flutes and balanced design ensure an extremely quiet run, reducing vibration and the risk of edge damage on sensitive components. The result is a reproducible chamfer quality that minimises rework and fits seamlessly into quality assurance processes.

Practical handling and reliable clamping for workshop use

The straight shank with three flats provides secure clamping in collets and drill chucks alike, improving concentricity and tool life. This secure grip, paired with the cutter’s right‑hand geometry, supports both stationary drilling machines and manual countersinking operations. The tool’s construction and coatings make it particularly suitable for routine workshop tasks where consistency and operator comfort are required.

Operating guidance and key machining data

For effective use in steel applications the tool achieves the best results with a recommended feed equivalent to the specification: 0.18 mm/rev at cutting forces up to 800 N. The millimetric feed specification (mm/rev) indicates the axial advance per spindle revolution and helps to reproduce the same surface quality across different machines. When setting up, ensure the workpiece is rigidly supported and the cutter clamped on the flats to maintain concentricity and prevent premature wear.

For consistent RUKO quality and high‑speed countersinking performance, contact Metav Werkzeuge in Emmerich for application support and reliable supply: info@metav-werkzeuge.com, +49 2822 7131930

Technical data

• Article number: 4000605552NW
• Item: ULTIMATECUT 4S countersink, 90° Ø16.5 mm, HSS, RUnaTEC, 4 flutes
• Packaging unit: 1

Core figures

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

Materials & special features

• Material: HSS
• Coating: RUnaTEC
• Shank with three flats
• Right‑hand cutting
• Optimised for stationary and manual countersinking
• Reduced feed force, quieter run, optimal finish
• Up to 3× more countersink cycles; up to 50% faster countersinking

FAQ

What materials is this countersink intended for?
The RUKO ULTIMATECUT 4S is designed principally for use in steel; its HSS core and RUnaTEC coating optimise wear resistance and cutting performance when countersinking steel components.

What does the 0.18 mm/rev specification mean in practice?
The value 0.18 mm/rev denotes the recommended axial feed per spindle revolution under a cutting force up to 800 N, helping to achieve the tool’s stated performance and finish consistency.

How should the tool be clamped for best accuracy?
Use the shank’s three flats to secure the cutter in a collet or chuck; firm clamping on the flats improves concentricity and reduces vibration, ensuring a clean chamfer.

Can the tool be used manually as well as in machines?
Yes — the cutter’s geometry and reduced feed forces make it suitable for both manual countersinking and stationary machining without compromising finish quality.

What performance gains can be expected compared with standard countersinks?
Compared with conventional countersinks, the ULTIMATECUT 4S offers significantly lower feed force, quieter operation, up to 50% faster countersinking and up to 3× the number of countersink operations before replacement.

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