10.4mm Countersink 90° HSS Special 3‑Flute Radially Reliefed, DIN 335C - MAPAL Dr. Kress SE & Co. KG

Benefit from precise chamfering and significantly reduced feed forces thanks to the optimised EUC geometry and HSS special coating, delivering steadier operation and extended tool life. Order the countersink directly via Metav Werkzeuge or consult the Metav team for tailored technical advice.

Countersink EUC DIN 335C 90° D 10.4 mm — HSS, 3‑flute (MAPAL)

A Countersink EUC DIN 335C 90° D 10.4 mm engineered for accurate chamfering and deburring across workshop and production environments.

• HSS special coated for extended tool life
• 90° DIN 335C geometry for precise countersinking
• 3 cutting edges with EUC unequal pitch for smooth run
• Reduced axial force by up to 50% for lower feed

Less feed force, more stable cutting

The combination of the EUC unequal pitch and the optimised 90° geometry reduces axial forces markedly, cutting axial load by up to 50% and radial load by approximately 25%. This results in a measurable reduction in feed effort and less tendency for chatter, which increases process stability and allows higher consistent throughput in serial operations. The reduction in mechanical stress also minimises wear on the machine spindle and fixture, supporting predictable cycle times in production.

Reliable chamfers on common engineering materials

Machined with HSS and a special coating, the tool is suited to working on steel, cast iron and non‑ferrous metals. The precision design with 3 cutting edges ensures a clean, repeatable chamfer and improved surface quality, so finishing steps are reduced. The effects of the geometry and prepared cutting edges are particularly noticeable when producing seating chamfers for countersunk fasteners or preparing holes prior to subsequent operations.

Extended service life through prepared cutting geometry

The precision execution, including radial relief grinding and refined cutting edge preparation, improves chip formation and dispersal. The special coating contributes to thermal stability and wear resistance, lengthening tool life under demanding conditions. For workshops and maintenance departments this translates into fewer tool changes, lower downtime and reduced consumable costs while maintaining component quality.

Practical operating parameters and compatibility

Designed in accordance with DIN 335C and with a right‑hand cutting direction, the tool features a cylindrical shank suitable for standard toolholders. The recommended feed in steel at cutting forces up to 500 N is 0.1 mm/rev, which balances surface finish and productivity. The precise geometry and consistent flute spacing make the tool compatible with common bench and machine drilling setups, allowing quick integration into existing workflows without the need for special fixtures.

For MAPAL quality and Metav’s logistical reliability, contact Metav Werkzeuge for procurement and technical consultancy at info@metav-werkzeuge.com or call +49 2822 7131930 to discuss suitability for specific applications

Technical Data

• Article number: 4000806028NW
• Designation: Countersink EUC DIN 335C 90° D 10.4 mm HSS special, cylindrical shank, 3 flutes, BECK
• Packaging unit: 1

Facts

• Diameter: 10.4 mm
• Countersink angle: 90°
• Cutting edges: 3
• Recommended feed (steel ≤ 500 N): 0.1 mm/rev

Special features

• HSS material
• Special coating
• DIN 335 C conformity
• Right‑hand cutting
• Precision execution
• Radially relief‑ground
• For steel, cast iron and non‑ferrous metals
• Axial force reduction up to 50%
• Radial force reduction approx. 25%
• Optimised geometry with prepared cutting edges
• Extreme unequal pitch (EUC)

FAQ

What materials is this countersink suitable for?
The Countersink EUC DIN 335C 90° D 10.4 mm from MAPAL is intended for steel, cast iron and non‑ferrous metals, offering clean chamfers and reduced tendency to chatter.

How does the EUC design improve performance?
The EUC (extreme unequal pitch) of the MAPAL countersink evens out cutting loads across the 3 cutting edges, reducing axial and radial forces and improving surface finish consistency.

What feed rate is recommended for steel?
For steel at cutting forces up to 500 N, the recommended feed is 0.1 mm/rev, which balances finish quality and productivity for the MAPAL countersink (SKU 4000806028NW).

Will the special coating increase tool life?
Yes; the special coating combined with the HSS substrate and prepared cutting edges extends service life by improving wear resistance and thermal stability under normal machining conditions.

Is this tool compatible with standard cylindrical toolholders?
The tool has a cylindrical shank and is suitable for standard holders and drill chucks commonly used in workshops and production machines.

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