20.5mm Countersink 90° HSS-E Co 5 Flute UltimateCut High Wear Resistance, 800 N Feed - Ruko GmbH

Combine the ULTIMATECUT's reduced axial and radial forces with HSSE‑Co5 wear resistance and an extra‑wide flute for reliable, rattle‑free countersinking; order directly via Metav Werkzeuge or consult our specialists for application guidance.

ULTIMATECUT countersink (DIN 335C) — 90° Ø20.5 mm, HSSE‑Co5 by Ruko

The ULTIMATECUT countersink is a 90° production countersink designed for quiet, accurate chamfers in workshop and production environments.

*New cutting geometry reduces axial and radial forces *Variable relief for smooth, chatter-free countersinks *Extra-wide flute for efficient chip and heat removal *HSSE-Co5 composition for high wear resistance

Consistent, vibration‑free chamfers for reliable assembly

The re‑engineered cutting geometry dramatically reduces axial and radial forces, which cuts down on vibration and produces an exact, round, rattle‑free countersunk surface. This stability lowers scrap rates and minimises rework, so a consistent chamfer quality is achieved across batches; the adherence to DIN 335C and the 90° angle ensures compatibility with common fastener standards. The design focus on force reduction also leads to more predictable machine loads and steadier cycle times in production.

Longer tool life through managed chips and heat

An extra‑wide flute and optimised chip‑space geometry promote efficient chip evacuation and heat removal, reducing thermal wear at the cutting edges. Combined with the HSSE‑Co5 material and the RunaTEC surface characteristics, this countersink resists material welding and retains cutting performance over extended runs. For production environments that demand durable tooling, these features translate into longer intervals between tool changes and more time machining parts rather than maintaining tooling.

Lower feed effort, flexible cutting speeds

The variable relief and new cutting edge profile reduce the required feed force during countersinking, enabling smooth engagement even under challenging conditions. The tool permits both high and low cutting speeds without compromising finish quality; in steel, a recommended feed is 0.2 mm/rev at clamping forces up to 800 N, which balances productivity with surface integrity. The lighter feed requirement is particularly useful where operator intervention is involved or where delicate workpieces must be preserved.

Practical advantages for workshops and production lines

The overall result is a countersink that delivers repeatable quality across a broad range of materials and applications, reducing process variation and downtime. The robust construction and improved heat and chip management mean fewer interruptions for tool changes and cleaning. For maintenance teams and production planners, this tool supports more predictable throughput and a higher first‑pass yield, making it a pragmatic investment for both small workshops and larger manufacturing cells.

For technical consultation or to procure the Ruko ULTIMATECUT countersink, contact Metav Werkzeuge in Emmerich for tailored advice and dependable supply

Technical data

• Article number: 8000422466NW
• Item description: Countersink ULTIMATECUT DIN 335C, 90° Ø20.5 mm, HSSE‑Co5, RunaTEC, 3 flutes
• Manufacturer: Ruko GmbH
• Packaging unit: 1

Facts

• Diameter: 20.5 mm
• Angle: 90°
• Flutes: 3
• Feed in steel up to 800 N: 0.2 mm/rev
• Standard: DIN 335C

Special features

• Newly developed cutting geometry reduces axial and radial forces
• Variable relief for smooth, chatter‑free countersinking
• Extra‑wide flute for optimised chip and heat evacuation
• RunaTEC surface characteristics reduce material welding
• High wear resistance for extended tool life
• Suitable for high and low cutting speeds

FAQ

What are the nominal diameter and angle of this countersink?
The Ruko ULTIMATECUT countersink has a nominal diameter of Ø20.5 mm and a 90° angle, conforming to DIN 335C for standard fastener seating.

What material is the tool made from and what does that mean for durability?
The tool is manufactured from HSSE‑Co5 (high‑speed steel with 5% cobalt), which provides improved heat resistance and wear resistance, extending service life under demanding machining conditions.

How many flutes does the countersink have and why does that matter?
The tool features 3 flutes, which balance cutting action and chip evacuation; this geometry, together with the extra‑wide flute, supports efficient chip removal and a stable countersinking process.

Are there recommended feeds or speeds for steel?
For steel applications with clamping up to 800 N, a feed of 0.2 mm/rev is indicated; the design allows performance at both high and low cutting speeds without losing surface quality.

What does the RunaTEC feature provide?
RunaTEC characteristics improve surface behaviour during cutting, reducing the tendency for material welding on the cutting edges and aiding in heat dissipation, which contributes to consistent results and longer tool life.

Which applications benefit most from this countersink?
The ULTIMATECUT is suited to production countersinking where consistent, round, rattle‑free chamfers and reduced rework are priorities, such as assembly preparation, precision engineering and maintenance tasks.

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