12.4mm Countersink EUC DIN 335C 90° HSS Special Coated 3-Flute Radially Reliefed - MAPAL Dr. Kress SE & Co. KG

Take advantage of the combination of precision geometry, reduced cutting forces and a special HSS coating for smoother, more reliable countersinking. The optimised EUC pitch and prepared cutting edges cut axial force by 50% and radial force by 25%, delivering steadier feeds and less chatter; order the Countersink EUC DIN 335 C 90° Ø12.4 mm directly via Metav Werkzeuge or ask our consultants if needed.

Countersink EUC DIN 335 C 90° Ø12.4 mm — HSS special, 3‑flute (MAPAL)

Countersink EUC DIN 335 C 90° Ø12.4 mm is a precision 3‑flute countersink designed for clean, low‑force operations in steel, cast iron and non‑ferrous metals

• DIN 335 C 90° countersink geometry
• HSS with special coating for longer life
• 50% reduction in axial cutting force
• Radially relieved, precision ground edges

Faster machining with markedly lower feed force

The EUC design combines an unequal pitch (EUC) with prepared cutting edges to reduce vibration and stabilise the cutting process. The result is a 50% reduction in axial force, which translates into lower feed effort and reduced load on spindles and fixtures. For practical planning, the tool specification indicates a recommended feed in steel up to 500 N of 0.12 mm/rev, enabling predictable cycle times and simpler process parameters. For production environments this means fewer rejected parts and less downtime for fixture adjustments, supporting a more efficient machining flow.

Steadier cutting and improved surface quality across materials

Thanks to the radial relief and the optimised flute geometry, the tool reduces radial forces by 25%, which lowers the tendency to chatter and results in a finer countersink surface finish. The cutter is specified for steel, cast iron and non‑ferrous metals, so the same tool can often cover a wider range of components without swapping inserts. The right‑hand cutting action and precision execution ensure consistent kerf formation, making the process more repeatable and reducing rework in downstream assembly.

Precision geometry that extends tool life and reliability

Manufactured to DIN 335 C and executed as a precision tool with a cylindrical shank, this countersink benefits from a special coating that mitigates built‑up edge and improves wear resistance under intermittent cutting conditions. The 3‑flute arrangement balances cutting stability with chip evacuation, while the prepared cutting edges support reproducible countersink diameters and angles. These design choices limit thermal load and wear, so the tool maintains its profile longer and delivers consistent part quality over multiple runs.

Simple integration into existing setups and predictable results

The cylindrical shank and standard DIN specification make machine integration straightforward, whether the tool is used in conventional drilling units or automated machining centres. The Ø12.4 mm diameter and 90° countersink angle match common fastener and seating requirements, allowing easy process documentation and inspection. Because the geometry reduces force and vibration, clamping requirements are less demanding and cycle stability improves — an advantage for both small workshops and larger production lines seeking dependable throughput.

For assured countersinking performance with MAPAL quality and Metav Werkzeuge’s reliable supply chain, contact Metav Werkzeuge for ordering and technical advice — eMail: info@metav-werkzeuge.com, Phone: +49 2822 7131930

Technical data

• Article number: 4000806034NW
• SKU/UID: 4000806034NW
• Product name: Kegelsenker EUC DIN 335C 90Grad D.12,4mm HSS spezial Zyl.schaft Z.3 BECK
• Packaging unit: 1
• Manufacturer: MAPAL Dr. Kress SE & Co. KG

Facts

• Diameter: Ø12.4 mm
• Countersink angle: 90°
• Standard: DIN 335 C
• Material grade: HSS (high‑speed steel)
• Number of flutes: 3
• Recommended feed (steel up to 500 N): 0.12 mm/rev

Special features

• Special coating
• Right‑hand cutting
• Precision execution, radially relieved
• Extremely unequal pitch (EUC) for vibration damping
• Prepared cutting edges
• Reduces axial force by 50%
• Reduces radial force by 25%
• Suitable for steel, cast iron and non‑ferrous metals
• Cylindrical shank

FAQ

What materials can this countersink process reliably?
The countersink is specified for steel, cast iron and non‑ferrous metals; its EUC geometry and coating make it suitable across these common workshop materials.

How does the EUC design affect vibration and finish?
The unequal pitch (EUC) reduces harmonic excitation, lowering chatter; combined with radial relief this improves surface finish and stability during countersinking.

What feed should be used as a guideline for steel?
A guideline from the specification is 0.12 mm per revolution for steel at cutting forces up to 500 N, providing a predictable starting point for process setup.

Is the diameter and angle standard for fastener seats?
Yes — the Ø12.4 mm diameter and 90° angle conform to common countersink requirements and the DIN 335 C standard for repeatable seating geometry.

Can this tool be used in standard chucks and holders?
The cylindrical shank makes the tool compatible with common chucks and holders used in drilling and machining centres, enabling straightforward integration.

Manufacturer/Responsible: MAPAL Dr. Kress SE & Co. KG, Ob. Bahnstrasse 13, 73431 Aalen