6.3–20.5mm Countersink Set DIN 335C 90° 3-Flute HSS In Plastic Case - Ruko GmbH

Efficient chamfering performance combined with sturdy storage makes this RUKO set a reliable choice for workshop and production use. With HSS cutting edges and a 90° chamfer geometry, the set delivers consistent results and reduced rework. Order the set directly via Metav Werkzeuge or consult our specialists for application-specific guidance.

RUKO Countersink Set DIN 335 C — HSS, 90° (6.3–20.5 mm)

The RUKO countersink set DIN 335 C is designed for precise chamfering and deburring in metalworking and general workshop tasks, complying with industry-standard geometry

• DIN 335 C standard, 90° countersink angle
• Three cutting edges for smooth chamfers
• High-speed steel (HSS) for durability
• Impact-resistant plastic case for safe storage

Consistent chamfers for reliable assembly

Conformity to DIN 335 C and a fixed 90° countersink angle ensure a repeatable seat for flathead fasteners, which reduces variability in assembly and minimises the need for reworking components. The cutters feature three cutting edges, which distribute cutting forces more evenly than two-flute designs; this results in a smoother finish and fewer burrs at the hole entry. For production environments where repeatability matters, the geometry supports reliable seating of screws and improved joint quality, helping to maintain assembly tolerances and reduce inspection effort.

Built for workshop endurance and consistent performance

The taps are manufactured from high-speed steel (HSS), providing a balance of hardness and heat resistance suitable for common countersinking speeds in workshop use. HSS tooling sustains cutting-edge integrity during repeated operations and resists premature wear under typical machining conditions. The material choice translates into predictable tool life and consistent chamfer quality across batches, which supports process stability and reduces unexpected downtime. Regular inspection of cutting edges will help maintain performance and identify when replacement is due.

Practical storage and handling to save time

The complete set is supplied in an impact-resistant plastic cassette, which protects the cutting edges from damage and keeps the tools organised for quick selection on the shop floor. Secure storage reduces the risk of blunt or nicked edges arriving at the machine, so operators spend less time sorting tools and more time machining. The cassette also simplifies transport between workstations and helps preserve cutter geometry, contributing to long-term cost efficiency through reduced tool loss and handling damage. For specialised applications or material compatibility queries, Metav’s advisors can provide targeted recommendations.

For assured countersinking performance with RUKO quality, contact Metav Werkzeuge in Emmerich to obtain the appropriate countersink set and personalised technical advice — info@metav-werkzeuge.com | +49 2822 7131930

Technical data

• Article number: 4000601498NW
• Label: Countersink set DIN 335 C 90° 6.3–20.5 mm HSS 6-piece plastic case RUKO
• Manufacturer: Ruko GmbH

Facts

• Angle: 90°
• Size range: 6.3–20.5 mm
• Cutting edges: 3
• Standard: DIN 335 C
• Pieces: 6

Special features

• Material: High-speed steel (HSS)
• Packaging: impact- and break-resistant plastic cassette
• Three-flute design for smooth finishing

FAQ

What sizes are included in the countersink set?
The RUKO countersink set covers a size range of 6.3–20.5 mm, supplied as a set of six cutters and identified by article number 4000601498NW.

Which standard and geometry do the countersinks follow?
The cutters conform to DIN 335 C and feature a 90° countersink angle, offering the standard seat geometry expected for flathead fasteners.

What material are the countersinks made from?
All cutters in the RUKO set are manufactured from high-speed steel (HSS) to provide durable cutting performance in typical workshop conditions.

How is the set supplied and stored?
The set is supplied in an impact-resistant plastic cassette that secures each cutter, simplifies organisation and protects edges during storage and transport.

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