31mm Countersink 90° Carbide Blank 3-Flute Shank 12mm CBN-Ground Chips - Ruko GmbH

Take advantage of razor-sharp CBN-ground flutes and a solid-carbide body for consistently burr-free, chatter-free countersinking; the tool excels in low-speed finishing and delivers reliable feed control at 0.22 mm/rev in steel. Order the countersink directly via Metav Werkzeuge or consult Metav's specialists for application advice.

90° countersink DIN 335C Ø31 mm, solid-carbide, 3-flute – RUKO

The 90° countersink DIN 335C Ø31 mm is a solid-carbide chamfering and deburring tool designed for burr-free, chatter-resistant countersinking at low cutting speeds

• 90° countersink to DIN 335C
• CBN-ground flutes for razor-sharp edges
• 3 flutes, Ø 31 mm, shank Ø 12 mm
• Low-speed use for burr-free finish

Clean edges through CBN-ground geometry

The tool’s CBN-ground flutes produce exceptionally sharp cutting edges that reduce mechanical deformation during chamfering. This geometry minimises burr formation and vibration, which results in a smooth perimeter ready for subsequent assembly or finishing. The solid-carbide construction combines hardness with toughness, offering a consistently high surface quality when used within recommended parameters.

Optimised for finishing at low cutting speeds

A 90° countersink angle follows common fastening standards, ensuring reliable contact with fastener heads. Best results are achieved at low cutting speeds, where heat generation is reduced and tool life is extended. The specified feed capacity in steel — 0.22 mm/rev at forces up to 500 N — allows controlled material removal and predictable edge geometry for high-quality chamfers and countersinks.

Designed for efficient chip control and stable running

With three flutes and a cutting diameter of Ø31 mm, the design balances chip evacuation and surface finish. The shank Ø12 mm suits standard collet chucks and toolholders, providing stable clamping and concentricity. Compliance with DIN 335C ensures compatibility with established manufacturing processes and facilitates integration into existing production routines without complex adjustments.

Reliable performance backed by a recognised brand and supply partner

Manufactured by RUKO, the tool reflects a focus on precision and repeatability in cutting-tool design. Supplied through Metav’s distribution network, the item benefits from dependable stock handling and technical filtering at Emmerich, helping to ensure consistent delivery and product conformity for workshops and industrial users alike.

Contact Metav Werkzeuge for technical application support or to secure supply of this RUKO 90° countersink; eMail info@metav-werkzeuge.com or call +49 2822 7131930 for specialist advice and ordering information

Technical data

• Article number: 4000601480NW
• SKU: 4000601480NW
• Manufacturer: Ruko GmbH
• Packaging unit: 1
• UID: 4000601480NW

Facts

• Cutting diameter: Ø 31 mm
• Shank diameter: Ø 12 mm
• Angle: 90°
• Number of flutes: 3
• Feed in steel up to 500 N: 0.22 mm/rev

Special features

• CBN-ground flutes for extremely sharp cutting edges
• Solid-carbide (HM) blank
• For burr-free and chatter-free countersinking and deburring
• Best results at low cutting speeds
• Conforms to DIN 335C
• Brand: RUKO

FAQ

What materials can this countersink process effectively?
The RUKO 90° countersink (SKU 4000601480NW) is optimised for steel finishing operations and delivers burr-free results; performance data specify a feed of 0.22 mm/rev in steel up to 500 N.

Is the tool suitable for standard toolholders?
Yes — the countersink has a shank Ø 12 mm, which is compatible with standard collets and chucks commonly used in workshop and production environments.

How does the CBN grinding benefit the cutting performance?
CBN-ground flutes create very sharp edges that reduce deformation and vibration during chamfering, enabling the RUKO countersink to produce a cleaner edge and more consistent surface finish.

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