25mm Countersink 90° Solid Carbide 3-Flute 10mm Shank CBN-Ground Flutes - Ruko GmbH

Benefit from razor-sharp cutting edges from the CBN-deep-ground flutes, a standard 90° seating geometry and a stable 3-flute design for burr- and chatter-free countersinking; order directly via Metav Werkzeuge or consult their specialists for application advice.

RUKO Countersink DIN 335 C, 90° Ø25 mm — Solid Carbide, 3 Flutes

A RUKO Countersink DIN 335 C 90° Ø25 mm engineered for burr-free countersinking, deburring and sinking, optimised for low cutting speeds and consistent results in demanding workshop environments

• CBN-ground flutes for ultra-sharp cutting
• 90° conical geometry for standard seating
• Ø25 mm cutting diameter with 3 flutes
• Shank Ø10 mm for standard toolholders

Clean seats and burr-free edges through precision flute grinding

The combination of CBN-ground flutes and the 90° conical geometry delivers consistently clean counterbores and minimal burr formation. The deep-ground flute profile produces exceptionally sharp cutting edges that reduce radial forces and suppress vibration, which results in a burr-free finish and quieter machining. This effect is especially noticeable when operating at low cutting speeds, where the tool removes material smoothly rather than tearing, so finishing operations require less manual rework and produce reliable seat quality for fasteners and fittings.

Stable solid-carbide construction for repeatable countersinking

A solid carbide body with 3 flutes ensures dimensional stability and good chip evacuation during countersinking and deburring. The Ø25 mm cutting diameter provides a wide seating surface while the shank Ø10 mm fits standard collets and toolholders for easy integration into existing tooling setups. The robust design supports repeatable performance across series production and one-off tasks alike, with the flute geometry engineered to reduce chatter and maintain the cutting edge over extended use.

Practical machining guidance and parameter advantages

Best results are achieved at low cutting speeds with a moderate feed; the tool is specified for a recommended feed of 0.2 mm/rev in steel up to ≤500 N, which balances chip formation and tool life. The geometry is tailored for efficient deburring and precise countersinking, and the deep-ground flute finish promotes consistent chip flow and reduced heat build-up. For users seeking application-specific settings or confirmation of machine compatibility, Metav Werkzeuge provides technical guidance and can advise on suitable toolholders and machining parameters.

Contact Metav Werkzeuge for tailored machining advice or to order the RUKO countersink; call +49 2822 7131930 or email info@metav-werkzeuge.com

Technical data

• Article number: 4000601479NW
• Designation: Countersink DIN 335 C, 90° Ø25 mm, solid carbide, 3 flutes
• Manufacturer: Ruko GmbH
• Packaging unit: 1
• UID: 4000601479NW

Facts

• Angle: 90°
• Cutting diameter: 25 mm
• Shank diameter: 10 mm
• Number of flutes: 3
• Recommended feed in steel (≤500 N): 0.2 mm/rev

Special features

• CBN deep-ground flutes
• Burr-free and chatter-free countersinking
• Best results at low cutting speeds
• Solid carbide (HM)

FAQ

What feed rate is recommended for steel?
The recommended feed for steel (up to 500 N) is 0.2 mm/rev; operating at lower cutting speeds improves finish with the RUKO countersink.

Which shank diameter is required for the toolholder?
The tool uses a shank Ø10 mm and is compatible with standard 10 mm collets and toolholders.

Which machining operations is this tool suited for?
Designed for countersinking, deburring and sinking, the tool produces burr-free seats and reduces chatter during finishing operations.

What ensures the cutter maintains a sharp cutting edge?
The CBN deep-ground flutes create razor-sharp cutting edges and optimised chip control, which extend effective cutting life and improve surface quality of the countersink.

What material is the tool made from?
The tool is manufactured from solid carbide (HM) for rigidity and wear resistance in workshop and production environments.

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