20.5mm Countersink DIN 335C 90° HSS Special Coating 3-Flute Right-Hand - MAPAL Dr. Kress SE & Co. KG

Benefit from the combination of precision geometry, significantly reduced axial and radial forces, and a durable special coating for smoother, more reliable countersinking; order the part directly via Metav Werkzeuge or consult our technical advisors if clarification is required.

Kegelsenker EUC DIN 335C 90° Ø20.5 mm — MAPAL taper countersink, HSS special, 3 flutes

The Kegelsenker EUC DIN 335C 90° Ø20.5 mm is a precision taper countersink designed for efficient chamfering and countersinking in steel, cast iron and non‑ferrous metals, conforming to DIN 335 C

• HSS special coating, precision 3‑flute geometry
• 90° taper to DIN 335 C standard
• Reduces axial force by 50%
• Suitable for steel, cast iron and non‑ferrous metals

Stable machining through optimised geometry and force reduction

The countersink's core advantage is its optimised geometry, created to lower machining forces and improve surface quality. The combination of 3 flutes, radial relief (radial hinterschliffen) and the EUC (extremely unequal division) layout reduces axial force by around 50% and radial force by roughly 25%, which translates into smoother feed, less spindle load and a marked reduction in chatter. These mechanical improvements enable a more consistent hole edge and reduce the likelihood of rework, supporting continuous production runs with fewer interruptions.

Faster, more efficient countersinking with HSS and special coating

Manufactured from high‑speed steel with a special coating, the tool is tailored for robust performance and extended tool life when processing a range of metals. The new cutting edge preparations and unbalanced pitch distribution optimise chip evacuation and minimise vibration, allowing for an advised feed in steel (under cutting forces up to 500 N) of approximately 0.18 mm/rev. Operators and production planners benefit from this predictable behaviour: lower feed forces mean reduced wear on holders and machine spindles, and often shorter cycle times without compromising edge quality.

Broad application range and workshop compatibility

Designed to the DIN 335 C standard and equipped with a cylindrical shank, the countersink suits conventional toolholders and automatic tool changers in many workshop environments. Its right‑hand cutting action and precision finishing make it appropriate for a variety of tasks, from deburring to final chamfering on components made of steel, cast iron and non‑ferrous metals. The precision execution and balanced design support reproducible results in both one‑off toolmaking and larger series production, while the special coating helps maintain cutting performance across mixed batches.

For MAPAL quality and measurable improvements in countersinking performance, contact Metav Werkzeuge in Emmerich for personalised technical advice and reliable supply for industrial and workshop needs

Technical data

• Article number: 4000806030NW
• Item designation: Taper countersink EUC DIN 335 C, 90°, Ø20.5 mm, HSS special, cylindrical shank, 3 flutes
• Packaging unit: 1

Facts

• Diameter: 20.5 mm
• Countersink angle: 90°
• Cutting edges: 3
• Feed in steel (≤500 N): 0.18 mm/rev
• Axial force reduction: approx. 50%
• Radial force reduction: approx. 25%

Special features

• HSS with special coating
• DIN 335 C conformity
• Right‑hand cutting
• Radial relief (radial hinterschliffen)
• Extremely unequal division (EUC) for vibration damping
• Prepared cutting edges for optimised countersinking
• Suitable for steel, cast iron and non‑ferrous metals
• Cylindrical shank

FAQ

What materials can this countersink process effectively?
The Kegelsenker EUC DIN 335C 90° Ø20.5 mm is suitable for steel, cast iron and non‑ferrous metals, providing reliable edge quality across these material groups.

How does the EUC layout improve machining performance?
The EUC (extremely unequal division) reduces harmonic excitation and vibration; in this countersink it contributes to a measured reduction of axial force by about 50% and radial force by about 25%, improving surface finish and tool stability.

What feed rates are recommended for steel operations?
Under cutting forces up to 500 N the tool is designed for a feed of around 0.18 mm/rev; adjustments may be necessary depending on workpiece rigidity and machine power.

Does the tool comply with industrial standards for countersinking?
Yes, the design follows DIN 335 C and is executed as a precision countersink with a 90° taper.

What features aid chip evacuation and prevent chatter?
The combination of 3 flutes, radial relief and prepared cutting edges improves chip flow and, together with the EUC pitch, significantly reduces chatter during countersinking.

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