20.5mm Countersink 90° HSS, Four-Flute RUnaTEC Coating, Three-Point Shank - Ruko GmbH

Take advantage of the HSS construction and RunaTEC surface treatment to achieve faster, cleaner countersinking with noticeably reduced feed force; the four‑flute geometry and 90° tip deliver a quiet run and an optimal finish, improving throughput in both stationary and manual operations — order the tool directly via Metav Werkzeuge or consult the team for integration advice.

RUKO ULTIMATECUT 4S Countersink — 90° • 20.5 mm • HSS RunaTEC‑coated

The ULTIMATECUT 4S is a 90° HSS countersink designed for high‑efficiency chamfering of steel in both bench and production environments, conforming to DIN 335 C and optimised for calm running and repeatable results

• HSS with RUnaTEC coating for long life
• Four‑flute geometry for fast material removal
• 90° tip for standard countersinking results
• Reduced feed force for easier manual use
• Smooth running with minimal chatter marks

Faster throughput and measurable productivity gains

The tool is engineered to increase productivity through a combination of four‑flute geometry and a low‑friction RunaTEC surface finish. These design elements reduce cutting resistance so that countersinking can be executed up to 50% faster and permit up to 3× more countersinks between reconditioning cycles compared with conventional designs. The specification for feed in steel — 0.21 mm/rev at up to 800 N — gives a concrete starting point for process planning and highlights the tool’s suitability for efficient, repeatable steel machining.

Cleaner results and quieter operation

Precision geometry and a 90° tip produce a consistently uniform chamfer with an optimal sink finish and minimal ratter or chatter marks. The combination of HSS substrate and the low‑friction coating keeps the cutting edges sharper longer, while the balanced four‑flute layout reduces vibration for an extremely quiet run. For operators and workshop managers this translates into reduced rework, improved component appearance, and a quieter machining environment that supports higher quality standards.

Robust clamping and practical workshop use

The shank is supplied with three flats to improve clamping reliability in chucks and spindles, preventing slippage during both manual and machine use. The tool’s right‑hand cutting geometry and conformity to DIN 335 C ensure compatibility with common workshop set‑ups and toolholders. Manufactured from HSS and finished with RunaTEC, the countersink balances durability with the sharpness required for repeatable chamfering in steel, making it a pragmatic choice for small‑batch jobs and continuous production alike.

Practical guidance for safe integration

For process reliability, secure clamping and consistent feed rates are essential; the indicated 0.21 mm/rev in steel (up to 800 N) should be used as an initial benchmark and adapted to the specific machine, material batch and coolant strategy. The tool performs well in both stationary and manual applications due to its reduced feed force requirement, but attention to steady feed and correct toolholder seating will extend service life and maintain the high‑quality finish. The ULTIMATECUT 4S design also reduces operator fatigue during hand‑held countersinking.

Contact Metav Werkzeuge for tailored application advice on the RUKO ULTIMATECUT 4S countersink, order information and integration support — call +49 2822 7131930 or email info@metav-werkzeuge.com

Technical data

• SKU: 4000605554NW
• Model: ULTIMATECUT 4S
• Brand: RUKO
• Net price: 72.95
• Packaging unit: 1

Facts

• Diameter: 20.5 mm
• Tip angle: 90°
• Flutes: 4
• Feed in steel up to 800 N: 0.21 mm/rev
• Standard: DIN 335 C

Special features

• HSS material
• RUnaTEC coating
• Shank with three flats
• Right‑hand cutting
• Best performance in stationary and manual use
• Reduced feed force required
• Up to 3× more countersinks possible
• Up to 50% faster countersinking
• Extremely quiet running
• Optimal sink finish without chatter marks

FAQ

What materials is this countersink intended for?
The ULTIMATECUT 4S is specified for the machining of steel; the design and HSS substrate combined with the RunaTEC finish make it particularly suited to steel countersinking tasks.

How does the four‑flute design affect cutting performance?
A four‑flute geometry increases material removal per revolution while smoothing the load on each cutting edge, which explains the tool’s faster cycle times and the reduced feed force reported in the technical details.

Is the tool compatible with standard chucks and toolholders?
Yes — the shank with three flats improves grip in conventional chucks and collets, ensuring reliable clamping for both hand‑held and machine operations.

What feed should be used as a starting point when countersinking steel?
Use the indicated feed of 0.21 mm/rev in steel up to 800 N as an initial benchmark and adapt according to the specific machine, material hardness and process conditions.

Does the RUKO ULTIMATECUT 4S require special coolant or lubrication?
Standard workshop practice applies; the HSS construction and coating are compatible with common cooling strategies, while steady feed and correct clamping will most influence tool life and finish quality.

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