8.3mm Countersink 90° Carbide 3-Flute Blank, Shank 6mm, CBN-Lapped Flutes - Ruko GmbH

Take advantage of the combination of solid carbide construction, CBN-ground flutes and a standard 90° geometry for consistently burr-free countersinking and reliable repeatability in production. Order the tool directly via Metav Werkzeuge or consult the technical team for machining parameters and fast delivery.

RUKO 90° Countersink DIN 335C — ø8.3 mm, solid carbide, 6 mm shank

The RUKO 90° Countersink DIN 335C is a solid-carbide countersink developed for burr-free countersinking, deburring and recessed seating in steel components, optimised for low cutting speeds.

• 90° DIN 335C geometry for standard countersinks
• Solid carbide body for high rigidity and wear resistance
• CBN-ground flutes for razor-sharp cutting edges
• Burr- and chatter-free finish at low cutting speeds

Consistent, measurable performance for production use

The 90° geometry combined with a solid carbide body gives a stable foundation for repeatable results in workshop and production settings. The CBN-ground flutes create exceptionally sharp cutting edges, which reduce radial forces and help avoid chatter; this translates into a burr-free finish and fewer rework operations. The tool’s construction favours controlled material removal rather than aggressive cutting, supporting quality-critical countersinking and deburring tasks.

Machining parameters that safeguard component quality

For steel applications the tool achieves best results at reduced spindle speeds with a recommended feed of 0.09 mm/rev under cutting loads up to 500 N, which keeps cutting temperatures lower and preserves edge life. The three-flute design balances chip evacuation and cutting contact, reducing the risk of built-up edge. These measurable parameters enable planners and operators to calculate cycle times and predict tool life more accurately, supporting efficient process planning and cost control.

Practical handling and integration into workshop tooling

A 6 mm shank allows straightforward use with common collets and holders, while the compact ø8.3 mm head size suits tight countersinking operations. The tool is supplied uncoated (blank) to suit finishing and low-speed countersinking; its compliance with DIN 335C ensures compatibility with standard countersink angles and fixtures. For buyers seeking a dependable supply chain, Metav’s distribution from Emmerich acts as a quality filter, delivering consistent tooling and expert advice.

Contact Metav Werkzeuge for tailored technical advice and prompt supply of the RUKO solid carbide countersink — support and delivery direct from Emmerich.

Technical data

• SKU: 4000601474NW
• Label: Kegelsenker DIN 335C 90Grad D.8,3mm HM Blank Z.3 Schaft-D.6mm RUKO
• Manufacturer: Ruko GmbH
• Packaging unit: 1
• UID: 4000601474NW

Core measurements

• Diameter: 8.3 mm
• Angle: 90°
• Shank diameter: 6 mm
• Flutes: 3
• Feed in steel up to 500 N: 0.09 mm/rev

Special features

• CBN-ground flutes
• Uncoated (blank) finish
• Material: solid carbide (HM)
• Application: countersinking, deburring, recessed seating
• Standard: DIN 335C

FAQ

Which materials is this countersink designed for?
The RUKO 90° solid carbide countersink (ø8.3 mm) is specified for countersinking and deburring in steel; optimal results are achieved at low cutting speeds with the stated feed of 0.09 mm/rev for steel loadings up to 500 N.

What holder or collet is required for the shank?
The 6 mm shank fits standard 6 mm collets and chucks; the RUKO countersink’s shank diameter enables secure clamping in common workshop holders for stable operation.

What cutting conditions are recommended to avoid chatter and burrs?
Lower spindle speeds combined with the recommended feed of 0.09 mm/rev help the RUKO countersink deliver a burr-free finish; the CBN-ground flutes reduce cutting forces and minimise the tendency to chatter.

How does the CBN grinding process improve performance?
CBN-ground flutes on the RUKO countersink produce extremely sharp, consistent cutting edges that promote smooth cutting action, better chip formation and a superior surface finish with less rework.

Manufacturer / Responsible: Metav Werkzeuge GmbH; Parkring 45; 46446 Emmerich; Germany; +49 2822 7131930; info@metav-werkzeuge.com