6-Piece Countersink Set DIN 373 HSS 3-Flute Spiral With Pilot And Cylindrical Shank, M3–M10 - Ruko GmbH

High-performance spotfacing and clean chip evacuation combine with robust guidance and convenient storage to keep production running smoothly; the set’s HSS construction and three cutting edges provide fast, accurate chamfering for metric threads. Order directly via Metav Werkzeuge or consult their specialists for integration advice.

RUKO countersink insert set DIN 373 M3–M10 — HSS, 3-flute, for threaded core holes

RUKO countersink insert set DIN 373 M3–M10 designed for precise spotfacing of threaded core holes in metric threads, offering reliable seating for screw heads and straightforward integration into standard tool-holding systems

• HSS, three cutting edges
• Conforms to DIN 373
• For thread sizes M3–M10
• Supplied in plastic cassette

Precise spotfacing that secures fasteners reliably

The set is made to deliver consistent spotfaces for metric threads, complying with DIN 373 to ensure repeatable results. Built in HSS, the cutters maintain edge integrity during routine operations while the three cutting edges reduce cutting load and help produce a homogenous bearing surface for screw heads. This targeted geometry minimises rework and supports stable assembly, so cycle times remain predictable and component fit is improved.

Robust guidance and chip control for stable machining

Guidance is provided by a fixed pilot pin, which centres the cutter in the core hole and reduces runout, while the cylindrical shank fits standard holders for quick tool changes. Spiral flutes aid chip evacuation, preventing clogging and helping to keep the machined chamfer free from burring. Together these features translate into fewer interruptions on the shop floor and a more consistent surface finish on each component.

Organised storage and process reliability for the workshop

The set arrives in a plastic cassette, keeping the cutters protected and organised at the bench; this simple storage solution supports efficient tool selection and reduces the risk of mix-ups. Covering the common thread range M3–M10 in one package streamlines tooling lists and lowers the number of changeovers during small-batch and repair work. Supplied by a trusted distributor, the product fits well in workflows that value traceability and predictable quality.

Contact Metav Werkzeuge for tailored advice on deploying the RUKO HSS countersink inserts in production; Metav Werkzeuge ships from Emmerich and provides technical guidance via info@metav-werkzeuge.com or +49 2822 7131930

Technical Data

• Article number: 4000601846NW
• Product label: countersink insert set DIN 373 M3–M10 for core holes, HSS, bright, 3 flutes, plastic cassette, RUKO
• Manufacturer: Ruko GmbH
• SKU: 4000601846NW
• Packaging unit: 1

Core data

• Thread range: M3–M10
• Cutting edges: 3
• Shank: cylindrical
• Fluting: spiral
• Guidance: fixed pilot pin
• Content: 6 units

Special features

• Material: HSS (high-speed steel)
• Standard: DIN 373
• Packaging: plastic cassette
• Brand: RUKO
• Application: spotfacing for threaded core holes

FAQ

Which thread sizes are covered by this countersink set?
The RUKO countersink insert set DIN 373 covers metric thread sizes from M3 to M10, providing the necessary diameters for common fastening applications.

What material are the cutters made of?
The cutters are manufactured from HSS (high-speed steel), chosen for its balance of toughness and wear resistance in general-purpose metalworking.

How is the cutter guided during machining?
Guidance is achieved with a fixed pilot pin, which centres the cutter in the core hole to reduce runout and improve concentricity for accurate spotfacing.

How are the inserts supplied for storage and transport?
The set is supplied in a plastic cassette, offering protected storage and easy organisation at the workstation.

Which standard does the set conform to?
The set is made to DIN 373, ensuring dimensional and functional compatibility with standard spotfacing requirements.

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