M3 Countersink DIN 373 180° 3-Flute HSS With Cylindrical Shank And Pilot Pin, Fine Grade - TECWERK

Take advantage of the combination of HSS construction, a 180° countersink angle and a three‑flute geometry for clean, chatter‑free countersinking in steel and cast iron; order the tool directly via Metav Werkzeuge or consult the specialists for machining parameter recommendations.

TECWERK Countersink DIN 373 M3 — HSS, 3‑flute, 180°

TECWERK Countersink DIN 373 M3 for precise through‑hole countersinking of cylinder head and hex screws in steel, cast iron and non‑ferrous metals

• HSS construction for robust cutting performance
• 180° countersink angle for flush seating
• Three cutting edges for chatter‑free finishing
• Cylinder shank with fixed pilot for accurate alignment

Precise, burr‑free countersinking for through holes

The TECWERK Countersink DIN 373 M3 is designed to produce clean, dimensionally consistent countersinks for cylinder head screws, hex screws and nuts. The tool conforms to DIN 373 and the fine grade specification for through holes, which ensures predictable seat geometry and minimal rework. The three‑flute cutter geometry distributes cutting forces evenly, reducing the tendency to chatter and producing a smoother surface finish — a concrete advantage when working with components destined for assembly where bolt seating and contact area are critical.

Consistent performance with conservative machining parameters

For reliable process planning, the cutter achieves best results at low cutting speeds; the specified feed in steel (up to 500 N) is 0.14 mm/rev, which balances material removal and surface integrity. The HSS material provides toughness and abrasion resistance across common workshop applications, while the 180° countersink angle guarantees a flush seating profile for standard fasteners. The cylinder shank combined with a fixed pilot ensures concentric guidance in through holes, so concentricity and perpendicularity are easier to maintain on conventional drilling machines and compact machining centres.

Wide material compatibility and reduction of finishing steps

This countersink is suitable for a broad range of materials including steel, cast iron, non‑ferrous and light metals, enabling a single tool to cover multiple operations on a production line or in a service shop. The geometry and grade are optimised for deburr‑free cutting, which reduces subsequent finishing steps and supports higher throughput. In practice, this means fewer tool changes, less manual deburring and a lower rate of fastener misfit — positively affecting overall efficiency and repeatability in small‑batch and serial production.

Practical benefits for workshop integration and tool management

The tool’s standard shank form and robust HSS construction simplify tool handling and mounting in common collets and chucks; the fixed pilot aids fast setup and repeatable alignment. These attributes contribute to predictable tool life and consistent part quality, helping to lower scrap rates and stabilise process capability. When planning tooling kits for assembly work or maintenance tasks, the combination of DIN conformity, fine grade, and a three‑edge cutting geometry offers a practical balance between cost‑efficiency and precision.

Contact Metav Werkzeuge for tailored machining advice and to secure the TECWERK HSS DIN 373 M3 countersink for accurate, repeatable through‑hole countersinking.

Technical Data

• Article number: 2000865331NW
• Item name: Flachsenker DIN 373 M3 Güte fein f.DL HSS Z.3 TECWERK
• Manufacturer: TECWERK
• Packaging unit: 1
• UID: 2000865331NW

Facts

• Countersink angle: 180°
• Cutting edges: 3
• Feed in steel (up to 500 N): 0.14 mm/rev

Special features

• Material: HSS
• Standard: DIN 373
• Shank: cylinder shank with fixed pilot
• Application: countersinking for cylinder head screws, hex screws and nuts
• Suitable materials: steel, cast iron, non‑ferrous and light metals
• Best results at low cutting speed
• Grade: fine grade for through holes

FAQ

Which materials are suitable for this countersink?
The TECWERK Countersink DIN 373 M3 (HSS, 3‑flute) is suitable for steel, cast iron, and non‑ferrous and light metals, offering versatile workshop use.

What is the countersink angle and why does it matter?
The countersink angle is 180°, which produces a flat seating surface for many cylinder head and hex screws, ensuring proper contact and load distribution.

What feed rate is recommended for steel applications?
A feed of 0.14 mm/rev is indicated for steel at cutting forces up to 500 N, providing a compromise between surface finish and efficient material removal.

Is the tool suitable for through‑hole countersinking?
Yes, the tool is specified as a fine grade for through holes, making it appropriate where consistent seat geometry is required across mating parts.

How does the fixed pilot improve results?
The fixed pilot on the cylinder shank stabilises the cutter in the hole, improving concentricity and reducing the risk of misalignment during countersinking.

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