6.3mm Countersink 90° Solid Carbide 3-Flute Shank 5mm, CBN Ground Flutes - Ruko GmbH

Take advantage of the combination of CBN-ground chip gullets, solid-carbide construction and precise 90° geometry for burr-free countersinking and reliable shop-floor performance; order directly via Metav Werkzeuge or ask our consultants for application advice.

RUKO 90° Countersink DIN 335C, Ø6.3 mm, solid carbide — shank Ø5 mm, 3-flute design

The RUKO 90° Countersink DIN 335C is a solid-carbide tool engineered for burr-free countersinking, deburring and spotfacing in steel, delivering consistent chamfer geometry and long-lasting cutting edges for industrial and trade workshops.

• CBN-ground chip gullets for razor-sharp edges
• Solid carbide construction for high rigidity
• 90° geometry for standard countersinking
• Shank Ø5 mm for secure clamping
• Optimised for low cutting speeds

Precision and cutting-edge geometry for consistent chamfers

The tool’s CBN-ground chip gullets produce exceptionally sharp cutting edges, reducing vibration and avoiding chatter during entry. Manufactured in solid carbide, the countersink combines rigidity with wear resistance, which translates into consistent chamfer geometry and burr-free results. The classic 90° angle meets common countersinking standards, so component fit and screw seating remain reliable without additional rework.

Controlled machining parameters for predictable performance

Designed with a 3-flute geometry and a nominal diameter of Ø6.3 mm, the tool is set up for stable chip evacuation and clean surface finish at conservative spindle speeds. For work in steel up to 500 N, a recommended feed is 0.09 mm/rev, a parameter tuned to preserve cutting-edge life while ensuring a smooth, chatter-free operation. The shank Ø5 mm ensures secure clamping in standard collets, supporting concentricity and repeatability on manual and CNC equipment.

Shop-floor advantages: less rework, more uptime

A burr-free finish reduces downstream processes such as manual deburring, lowering labour input and cycle time. The combination of CBN-ground gullets and solid-carbide substrate extends tool life, which reduces tool changes and keeps production flowing. The compact dimensions and robust design make this countersink a practical choice for maintenance, tooling shops and small-batch production where predictability and finish quality matter. The RUKO designation signals a specialist cutting tool suited to professional environments.

For burr-free, shop-ready countersinking with the RUKO 90° countersink, contact Metav Werkzeuge for stock information and machining guidance at info@metav-werkzeuge.com or +49 2822 7131930

Technical data

• Article number: 4000601473NW
• Designation: 90° Countersink DIN 335C, Ø6.3 mm, solid carbide, uncoated
• Brand: RUKO

Facts

• Diameter: 6.3 mm
• Shank diameter: 5 mm
• Included angle: 90°
• Flutes: 3
• Feed in steel (≤ 500 N): 0.09 mm/rev

Special features

• Material: solid carbide (HM)
• Coating: uncoated (blank)
• CBN-ground chip gullets for sharp edges
• Applications: countersinking, deburring, spotfacing
• Packaging unit: 1
• UID: 4000601473NW

FAQ

What materials is this countersink designed for?
The RUKO 90° countersink is specified for use in steel, with recommended feeds noted for steel up to 500 N to ensure optimal surface finish and tool life.

What feed and speed settings are advised for this tool?
For steel applications up to 500 N, follow the recommended feed of 0.09 mm/rev; the tool performs best at lower cutting speeds to protect the solid-carbide cutting edges.

How does the CBN-ground design affect results?
CBN-ground chip gullets create razor-sharp edges and improve chip control, which reduces chatter and delivers a burr-free finish on chamfers and countersinks.

Is the shank compatible with standard collets?
Yes, the shank Ø5 mm is suitable for secure clamping in common collets and holders, supporting concentricity and repeatable results for small-diameter countersinking.

Which SKU corresponds to this countersink for ordering or queries?
Refer to SKU 4000601473NW when enquiring about the RUKO 90° countersink to ensure the correct item is supplied.

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