31mm Countersink 90° HSS Four-Flute RUnaTEC Coated, Right-Hand Shank With Three Flats - Ruko GmbH

Take advantage of the combination of HSS cutting performance and RunaTEC coating for longer life and faster countersinking; the four‑flute geometry and 90° conical angle deliver quiet operation and an optimal, chatter‑free finish. Order the tool via Metav Werkzeuge or consult our specialists for application guidance.

RUKO ULTIMATECUT 4S countersink – HSS, RUnaTEC coated, Ø 31 mm, 90°

The RUKO ULTIMATECUT 4S is a precision HSS countersink designed for fast, low‑force chamfering and deburring in both stationary machinery and manual operations

• HSS with RUnaTEC coating for extended tool life
• Four-flute geometry for fast, smooth chamfering
• 90° conical cut, Ø 31 mm for standard countersinking
• Low feed force; up to 50% faster countersinking

Rapid, measurable productivity gains for machining workflows

The combination of HSS substrate and RunaTEC coating reduces wear and adhesion during cutting, enabling a higher number of reliable operations. The four‑flute design and optimised geometry lower the required feed forces, which translates into up to 50% faster countersinking and the possibility of performing up to 3x more countersinks under comparable conditions. For organised production environments this means shorter cycle times and a more consistent throughput without sacrificing finish quality. The tool maintains a steady cut at the recommended feed of 0.25 mm/rev in steel up to a clamping force of 800 N, supporting predictable process planning.

Consistent surface quality and reduced operator effort

A conical 90° cutting angle combined with the four‑flute profile produces a repeatable chamfer with an optimised countersink finish and minimal risk of chatter marks. The geometry supports superior chip evacuation, resulting in an extremely quiet run and less vibration during use. In handheld or manual set‑ups, the reduced feed force lessens operator fatigue and improves handling, while in bench or CNC applications the same characteristics provide tighter process windows and fewer rejects. The result is better component aesthetics and less rework.

Robust design detail that facilitates secure clamping and safe operation

Conforming to DIN 335C, the tool features a shank with three flats for positive clamping in collets and standard holders, ensuring rotational security and repeatable concentricity. The countersink is right‑hand cutting and supplied in a single unit packaging. The combination of the Ø 31 mm cutting diameter and the 90° angle makes the tool suitable for general countersinking tasks in steel, while the four cutting edges distribute cutting forces evenly to improve stability. The RunaTEC layer reduces friction and extends service life, helping to lower tooling costs over time.

For reliable high‑performance countersinking with proven durability, request the RUKO ULTIMATECUT 4S via Metav Werkzeuge — contact our consultants at info@metav-werkzeuge.com or call +49 2822 7131930 for tailored application advice

Technical Data

• Article number: 4000605557NW
• Product: ULTIMATECUT 4S countersink, 90°, Ø 31 mm, HSS, RUnaTEC, 4 flutes
• Manufacturer: Ruko GmbH
• Packaging unit: 1

Facts

• Diameter: Ø 31 mm
• Countersink angle: 90°
• Number of flutes: 4
• Feed in steel up to 800 N: 0.25 mm/rev
• Standard: DIN 335C
• Cutting direction: right‑hand cutting

Special features

• Material: HSS
• Coating: RUnaTEC
• Shank with three flats for secure clamping
• Low feed force for faster countersinking
• Extremely quiet run and optimal finish without chatter marks
• Best performance in stationary and manual applications
• Up to 3x more countersinks possible in comparable conditions

FAQ

What materials can be processed with this countersink?
The RUKO ULTIMATECUT 4S is specified for machining steel and is optimised for steel applications with a recommended feed of 0.25 mm/rev under loads up to 800 N.

Which shank type does the tool have for clamping?
The tool is supplied with a shank featuring three flats to ensure secure and repeatable clamping in standard collets and holders.

How does the RUnaTEC coating benefit the tool?
The RunaTEC coating reduces friction and adhesion during cutting, extending tool life and improving surface quality for each countersink operation.

Is the tool suitable for manual as well as machine use?
Yes, the geometry and low feed force make the countersink effective in both handheld/manual work and stationary machine applications, delivering a quiet run and consistent finish.

What standard does the countersink conform to?
The design follows DIN 335C, enabling straightforward integration into typical countersinking workflows.

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