6 Pieces 3-Flute Countersink Set DIN 373 HSS For M3–M10 With Fixed Pilot And Cylindrical Shank - Ruko GmbH

Take advantage of precise, standard-compliant countersinking combined with efficient chip evacuation and secure clamping for fewer reworks and a steadier workflow; order via Metav Werkzeuge or consult the team for a tailored recommendation.

Ruko flat countersink set DIN 373, HSS, for M3–M10

Ruko flat countersink set DIN 373, HSS, for M3–M10 is designed for producing clean, flat countersinks for metric threaded holes in a workshop or production environment

• HSS construction for long tool life
• Spiral-fluted design for efficient chip removal
• Fixed pilot pin for precise centring
• Cylindrical shank for secure clamping

Accurate, standard-compliant countersinking that reduces rework

The DIN 373 specification ensures a reproducible geometry for flat countersinks, which translates into consistent seating for fasteners and fewer assembly issues. Made from HSS, the cutters are designed to retain cutting performance under repeated use; this high-speed tool steel provides a balance of toughness and wear resistance. The integrated fixed pilot pin centres the tool in the pre-drilled hole, so concentricity is improved and the risk of burr formation is reduced. As a result, post-process finishing and corrective work are minimised, supporting a smoother production flow and predictable results.

Efficient chip control and robust cutting geometry for higher uptime

The spiral-fluted design combined with three cutting edges promotes controlled chip formation and fast evacuation from the hole, lowering the chance of clogging and heat build-up. The three-cutting-edge geometry also distributes cutting forces evenly, which supports a stable cut and extends tool life. With a cylindrical shank compatible with standard chucks and holders, the cutters maintain secure clamping and reduce vibration—this improves surface quality and helps to keep set-up times short, contributing to measurable gains in workshop efficiency.

Compact organisation and practical range for everyday workshop use

Covering thread sizes from M3–M10, the set provides the common dimensions required for routine thread preparation in maintenance, assembly and light production tasks. The cutters are supplied in a plastic cassette that keeps each tool organised and protected, easing tool selection and storage at the bench. The combination of standard geometry, durable material and thoughtful packaging makes the set a practical addition to any precision workshop, where consistent countersinking and quick tool changes support reliable assembly operations.

For expert advice on the Ruko flat countersink set or to arrange supply, contact Metav Werkzeuge via info@metav-werkzeuge.com or call +49 2822 7131930 — the Metav team provides tailored procurement and reliable delivery from Emmerich.

Technical data

• Article number: 4000601842NW
• Item designation: Flat countersink set DIN 373 M3–M10, HSS

Facts

• Thread range: M3–M10
• Cutting edges: 3
• Standard: DIN 373
• Shank: cylindrical
• Material: HSS
• Contents: 6 items

Special features

• Spiral-fluted geometry
• Fixed pilot pin for centring
• Plastic cassette for storage
• Countersinks for M3, M4, M5, M6, M8, M10

FAQ

What standard does the countersink set comply with?
The set is manufactured to DIN 373, ensuring standardised flat countersink geometry for repeatable seating of fasteners.

Which materials are suitable for countersinking with this set?
The HSS construction is suitable for general workshop materials commonly encountered in assembly and maintenance; tool selection should be matched to the specific material and application.

How does the fixed pilot pin improve results?
The fixed pilot pin provides reliable centring in pre-drilled holes, reducing run-out and burrs and thereby improving the finish around the threaded hole.

Are the cutters compatible with standard chucks?
Yes, the cylindrical shank format is intended for secure clamping in common drill chucks and tool holders used in routine workshop operations.

Does the set include all common thread sizes for metric fasteners?
The set covers metric thread sizes from M3–M10, providing the common dimensions needed for many fastening tasks

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