12.4mm Countersink HSS 4-Flute 90° RUnaTEC Coating, 0.15mm/rev Feed in Steel - Ruko GmbH

Benefit from the high cutting efficiency and the quiet, vibration-minimised run for faster, repeatable chamfering; order directly via Metav Werkzeuge or consult the Metav specialists for application advice.

ULTIMATECUT 4S 90° Countersink, 12.4 mm — RUKO HSS with RUnaTEC coating

The ULTIMATECUT 4S is a 90° HSS countersink designed for fast, low-force chamfering and deburring of steel in both manual and stationary setups

• HSS with RUnaTEC coating
• Four cutting edges for smooth finish
• 90° angle for standard chamfering
• Shank with three flats for secure clamping

Faster chamfering with measurable productivity gains

Engineered for production and workshop environments, the ULTIMATECUT 4S delivers clear efficiency advantages: the RunaTEC-coated HSS geometry and four cutting edges reduce feed force and enable up to 50% faster countersinking compared with conventional designs. The tool’s geometry allows for up to 3× more countersinks per tool life under comparable conditions, which lowers tool change frequency and increases uptime. The specification for feed in steel — 0.15 mm/rev at loads up to 800 N — provides a reliable starting point for setting machining parameters on drill presses and pillar drills.

Consistent surface quality that reduces rework

The cutter’s profile conforms to DIN 335C, ensuring reproducible chamfer geometry for subsequent assembly or welding operations. The four-flute design delivers an optimal countersink without chatter marks, producing a clean chamfer edge that minimises secondary finishing. Stable cutting forces and an extremely quiet running behaviour reduce vibration transfer to the workpiece, helping to preserve critical tolerances and finish quality in sensitive components.

Robust clamping and versatile use in manual & stationary operations

A shank with three flats ensures secure gripping in chucks and holders, preventing slippage during heavier feeds or interrupted cuts. The tool is right-hand cutting and made from HSS, which offers the toughness required for intermittent cutting and the heat resistance needed in production runs. These design elements make the cutter suitable for both manual countersinking tasks and repeated use in fixed tooling stations, giving workshops a single tool that performs across different setups.

Coating and material benefits explained for practical decisions

The RUnaTEC coating increases wear resistance and flank life, which contributes to the stated productivity gains by delaying the onset of wear-related deterioration. High-speed steel provides a balance of hardness and toughness that is preferable for steel machining when compared with high-brittleness alternatives; it absorbs impact from hand-guided operations while maintaining edge integrity in continuous use. In practice, this combination reduces the likelihood of premature tool failure and leads to a steadier process window for chamfering operations.

For workshops seeking a reliable, high-efficiency countersinking solution, select the RUKO coated HSS option and contact Metav Werkzeuge for tailored technical guidance or to arrange purchase — email info@metav-werkzeuge.com or call +49 2822 7131930

Technical Data

• Article number: 4000605550NW
• Label: Kegelsenker ULTIMATECUT 4S DIN 335C 90Grad D.12,4mm HSS RUnaTEC Z.4 RUKO
• Manufacturer: Ruko GmbH
• Packaging unit: 1

Facts

• Material: HSS
• Coating: RUnaTEC
• Standard: DIN 335C
• Diameter: 12.4 mm
• Countersink angle: 90°
• Cutting edges: 4
• Feed in steel (up to 800 N): 0.15 mm/rev

Special features

• Shank with three clamping flats
• Right-hand cutting
• Suitable for manual and stationary use
• Designed for steel machining
• Optimised for low feed force and quiet running

FAQ

What materials is this countersink suitable for?
The ULTIMATECUT 4S is specified for machining steel; the combination of HSS and RUnaTEC coating is optimised for steel applications.

How does the RUnaTEC coating affect tool life?
The RUnaTEC coating increases wear resistance and contributes to the enhanced tool life and the claimed productivity improvements of the ULTIMATECUT 4S.

What clamping systems are compatible with the shank design?
The shank with three flats permits secure gripping in standard chucks and collet holders, reducing slippage during heavier feeds.

Which standard ensures the chamfer geometry of this tool?
The cutter geometry complies with DIN 335C, which ensures consistent 90° chamfer profiles for repeatable assembly and finishing.

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