M4 Countersink DIN 373 HSS 180° 3-Flute Fine Grade, Cylinder Shank Fixed Pilot - TECWERK

Achieve burr-free, repeatable countersinks with a fine-grade HSS cutter featuring three cutting edges and a 180° geometry; combined with a cylindrical shank and fixed pilot pin, this tool ensures stable centring and smooth seating of fasteners. Order directly via Metav Werkzeuge or ask the consultants for guidance.

TECWERK flat countersink DIN 373 M4 — HSS three-flute countersink, 180°

The TECWERK flat countersink DIN 373 M4 is a precision HSS countersink designed for burr- and chatter-free preparation of seating surfaces for cylinder-head and hexagon head screws, nuts and similar fasteners in a range of metals

• HSS material, DIN 373 standard
• 180° countersink angle for flush seating
• Three cutting edges for smooth finish
• Cylindrical shank with fixed pilot pin

Consistent, burr-free countersinking that reduces rework

Made from HSS, this three-flute countersink delivers a burr-free finish and predictable chip formation. The three cutting edges distribute cutting forces evenly, which reduces vibration and minimises the risk of chatter when working in mixed materials. As a result, the need for secondary deburring operations is reduced, improving throughput and cutting down rework. The tool’s fine grade specification is optimised for through-hole applications and produces clean countersinks that support secure, flush screw seating.

Precise geometry for reliable seating and repeatable results

The tool’s 180° countersink angle provides a broad seating surface that suits cylinder-head and hexagon head screws, enabling consistent clamp-up and improved joint integrity. A cylindrical shank combined with a fixed pilot pin secures concentric running and fast, repeatable positioning in pre-drilled holes. This geometry translates into fewer alignment errors during assembly and a predictable surface finish, which is particularly valuable where component fit and aesthetic quality matter.

Optimised for common workshop materials and efficient cutting

Engineered for reliable performance in steel, cast iron and non-ferrous metals, the cutter achieves its best results at low cutting speed, where its geometry and grade deliver stable cutting. The tool is suitable for a wide range of light alloys and general-purpose workshop tasks, offering a pragmatic balance between tool life and surface quality. Compliance with DIN 373 ensures a standardised form that integrates seamlessly into existing machining routines, while the single-piece supply (packaging unit 1) supports easy stock management.

For burr-free countersinking with TECWERK fine-grade HSS cutters, contact Metav Werkzeuge in Emmerich for ordering and technical advice at info@metav-werkzeuge.com or by phone on +49 2822 7131930

Technical data

• Article number: 2000865332NW
• Label: Flachsenker DIN 373 M4 Güte fein f.DL HSS Z.3 TECWERK
• Packaging unit: 1
• Manufacturer: TECWERK

Core technical data

• Countersink angle: 180°
• Number of cutting edges: 3
• Feed in steel up to 500 N: 0.16 mm/rev
• Grade: fine for through hole
• Standard: DIN 373

Special features

• Material: HSS
• Cylindrical shank with fixed pilot pin
• For countersinking cylinder-head screws, hexagon head screws and nuts
• Ideal for burr- and chatter-free countersinking in steel, cast iron, non-ferrous and light metals
• Optimised for best results at low cutting speed

FAQ

What materials can this countersink handle?
The TECWERK flat countersink DIN 373 M4 is suitable for steel, cast iron and non-ferrous metals, offering burr-free countersinking across these material groups.

What is the recommended cutting speed for best results?
Best results with this fine-grade HSS countersink are achieved at a low cutting speed, which promotes stable cutting and a clean finish.

How does the pilot pin affect the countersinking result?
The fixed pilot pin ensures accurate centring and reduces the risk of walking, so the countersink maintains concentricity and repeatable seating for fasteners.

What size screws is the tool intended for?
The cutter is designed to produce countersinks for cylinder-head screws, hexagon head screws and nuts in accordance with its 180° geometry and fine-grade specification.

What is the article number for ordering or reference?
The article number (SKU) is 2000865332NW for the TECWERK flat countersink DIN 373 M4.

Manufacturer / Responsible: NORDWEST Handel AG, Robert-Schuman-Straße 17, 44263 Dortmund