20.5mm Countersink 90° CBN Ground Flutes 3-Flute Solid Carbide 10mm Shank - Ruko GmbH

Take advantage of the combination of a solid carbide body and CBN-ground flutes for burr-free countersinking and consistent edge quality; the sturdy 10 mm shank ensures vibration-free clamping. Order the cutter directly via Metav Werkzeuge or contact their specialists for application-specific advice.

Conical countersink DIN 335C 90° Ø 20.5 mm (solid carbide, CBN-ground flutes) — RUKO

The Conical countersink DIN 335C 90° Ø 20.5 mm is a precision cutter designed for burr-free countersinking, deburring and chamfering in industrial and workshop environments.

• 90° conical countersink, Ø 20.5 mm
• Solid carbide with CBN-ground flutes
• 3 flutes, 10 mm shank for rigid clamping

Consistent, burr-free finish for demanding production

The conical design with a 90° angle delivers reliable countersinking geometry that reduces rework and ensures repeatable clamp-fit for fasteners. Thanks to the CBN-ground flutes, the cutting edges remain exceptionally sharp, producing clean chamfers and minimal burring even on repeat operations. For workshops seeking predictable results, this cutter lowers scrap rates and shortens downstream finishing time.

Durable cutting performance through advanced materials

Manufactured in solid carbide, the tool combines hardness and toughness for sustained edge life in common engineering materials. The CBN-ground flutes are ground to depth to create keen cutting lips that resist edge wear and maintain form accuracy over many cycles. Explained simply: the carbide core gives the strength, while the CBN finishing of the flutes produces the consistently sharp edges that reduce burr formation and extend service intervals.

Efficient machining parameters and secure handling

With 3 flutes and a 10 mm shank, the cutter offers a balance between chip evacuation and stiffness to reduce chatter during plunge operations. The design yields best results at low cutting speeds; in steel under a cutting resistance up to 500 N a feed of 0.2 mm/rev is recommended for optimal surface quality. The robust shank diameter supports rigid clamping, enabling higher process stability and faster cycle times compared with undersized tools.

Versatile uses across workshops and production lines

Intended for deburring, countersinking and chamfering, this cutter suits fabrication shops, maintenance departments and precision workshops working primarily with steel components. The tool is supplied as a single unit for straightforward inventory planning (packaging unit: 1). If process uncertainties arise during selection or set-up, Metav’s technical advisors can provide machining recommendations and help align the cutter with specific production requirements.

For burr-free, repeatable countersinking rely on RUKO’s carbide cutter — contact Metav Werkzeuge for tailored machining advice and swift supply from Emmerich: info@metav-werkzeuge.com · +49 2822 7131930

Technical Data

• Article number: 4000601478NW
• Brand: RUKO
• Designation: Conical countersink DIN 335C, 90° Ø 20.5 mm, solid carbide, 3 flutes, shank Ø 10 mm

Facts

• Angle: 90°
• Diameter: 20.5 mm
• Shank diameter: 10 mm
• Number of flutes: 3
• Feed in steel (up to 500 N): 0.2 mm/rev

Special features

• CBN deep-ground flutes for very sharp cutting edges
• Solid carbide construction for high wear resistance
• Suitable for deburring, countersinking and chamfering
• Best results at low cutting speed
• Packaging unit: 1

FAQ

What materials can be processed with this countersink?
The RUKO conical countersink is optimised for steel work and common workshop alloys; its solid carbide body and CBN-ground flutes provide durability and clean edges when used at the recommended cutting parameters.

What speed and feed should be used for steel?
For steel with a cutting resistance up to 500 N the cutter achieves best results at low cutting speed and a feed of around 0.2 mm per revolution, as specified for this tool.

Is the shank suitable for standard collets and tool holders?
The cutter has a 10 mm shank, designed for rigid clamping systems and standard 10 mm collets or chucking solutions to reduce vibration and improve finish quality.

Can this tool be used for stainless or non-ferrous metals?
The countersink is mainly specified for steel applications; performance in stainless or non-ferrous metals will depend on adapting cutting speed and feed — testing under application conditions is recommended.

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