8.3mm Countersink EUC DIN 335C 90° HSS Special Coated 3-Flute, Precision Radial Relief - MAPAL Dr. Kress SE & Co. KG

Benefit from the combination of precision geometry, a specialised HSS coating and markedly reduced cutting forces for smoother, more consistent countersinking in steel, cast iron and non‑ferrous metals; order directly via Metav Werkzeuge or consult our advisors for specification guidance.

MAPAL Countersink EUC DIN 335 C, 90° D 8.3 mm — HSS special, 3‑flute countersink

The MAPAL Countersink EUC DIN 335 C is a precision 90° countersink designed for industrial chamfering and deburring of steel, cast iron and non‑ferrous metals in workshop and production environments

• Precision 90° geometry for accurate chamfers
• HSS special coating for extended tool life
• Extremely unequal flute division reduces chatter
• Cuts steel, cast iron and non‑ferrous metals

Consistent chamfers with reduced cutting forces

The countersink combines a DIN 335 C standard geometry with an advanced HSS formulation and a special coating, producing reliable chamfers and deburrs. The optimised cutting geometry and extremely unequal flute division (EUC) reduce the axial force by around 50% and the radial force by about 25%, which translates into lower feed effort and a reduced tendency to chatter. For production shops this means more stable machining, fewer rejects and less operator fatigue when processing mixed batches of materials.

Precision features that improve process reliability

Radial relief and prepared cutting edges make this tool a precision execution piece suitable for demanding applications. The tool’s three cutting edges and right‑hand cutting orientation support smooth chip flow and consistent surface finish. The combination of precision grinding and the EUC layout limits vibration and helps maintain dimensional accuracy during countersinking—an essential advantage when downstream assembly tolerances are tight.

Clear performance data for machining decisions

Designed for through‑hole and finishing operations, the tool offers controlled feeds in tougher materials: recommended feed in steel up to 500 N is 0.1 mm/rev, ensuring repeatable performance across batches. The 90° angle is industry standard for many fastener seats, enabling interchangeability and predictable seating depths. Where process efficiency is a priority, the reduced axial and radial loads mean less strain on drivers and fixturing, which can contribute to longer tool life and fewer machine stops.

Practical benefits at the workshop level

For maintenance workshops and machining centres alike, the countersink’s HSS special material and coating extend tool life while maintaining edge stability. The design is particularly useful when switching between steel, cast iron and non‑ferrous metals, as the tool sustains good cutting behaviour across these materials without frequent tool changes. In short runs or mixed production, the tool reduces setup time and increases throughput by lowering rework and improving the consistency of chamfers.

For personalised advice on integrating this MAPAL countersink into existing production processes or to request technical data sheets, contact Metav Werkzeuge at info@metav-werkzeuge.com or call +49 2822 7131930 for tailored support and reliable delivery from our Emmerich hub

Technical data

• Article number: 4000806123NW
• Product: Countersink EUC DIN 335 C, 90° D 8.3 mm, HSS special, 3‑flute
• Manufacturer: MAPAL Dr. Kress SE & Co. KG
• Packaging unit: 1

Facts

• Diameter: 8.3 mm
• Countersink angle: 90°
• Cutting edges: 3
• Feed in steel (up to 500 N): 0.1 mm/rev

Special features

• Material: HSS
• Coating: special coating
• Standard: DIN 335 C
• Right‑hand cutting
• Precision design, radially relieved
• EUC: extremely unequal flute division
• Suitable for steel, cast iron and non‑ferrous metals
• Axial force reduced by ~50%
• Radial force reduced by ~25%

FAQ

What materials can this countersink process?
The MAPAL countersink EUC DIN 335 C is suitable for machining steel, cast iron and non‑ferrous metals, offering consistent chamfers across these material groups.

How does the EUC flute division improve performance?
Extremely unequal flute division (EUC) on the countersink breaks up harmonic frequencies during cutting; this reduces chatter and contributes to the reported reductions in axial and radial forces for a smoother operation.

What feed should be used when countersinking steel?
For steel under cutting loads up to 500 N, use a feed around 0.1 mm/rev, as specified for the tool to maintain edge life and surface quality.

Is the tool suitable for precision assembly applications?
Yes — the precision execution, radially relieved geometry and DIN 335 C standard angle make the countersink well suited for applications where consistent seating and minimal rework are required.

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