20.5mm Countersink DIN 335C 90° HSS Extra-Long Shank 3-Flute For Steel Cast Non-Ferrous - TECWERK

The combination of HSS construction, a three-flute geometry and an extended shank delivers precise, rattle-free countersinking even in deep holes; this improves surface finish and reduces rework. Benefit from the standard 90° angle and a recommended feed of 0.2 mm/rev in steel up to 500 N for consistent, repeatable results. Order the TECWERK countersink directly via Metav Werkzeuge or ask our consultants if needed.

TECWERK 90° Conical Countersink DIN 335 C — Ø20.5 mm, HSS, extended shank

The TECWERK Conical Countersink DIN 335 C, 90° Ø20.5 mm, HSS is an over-long, three-flute countersink with a cylindrical shank, designed for reliable countersinking and deburring of holes in steel, cast iron and non‑ferrous metals.

• HSS construction, DIN 335 C specified
• 90° countersink angle for standard holes
• Three-flute design for rattle-free cutting
• Extended shank for deep countersinking

Clean, consistent countersinks for repeatable assembly

Engineered for industrial and workshop use, this countersink uses HSS to balance toughness and wear resistance, producing clean chamfers and deburred edges that meet assembly and coating requirements. The three-flute geometry reduces chatter and delivers a rattle-free cut, which translates into fewer rejects and less manual finishing. Conformance with DIN 335 C ensures predictable geometry for fastener seating and consistent joint performance.

Broad material compatibility for diverse workshop tasks

The tool is suitable for machining steel, cast iron and non-ferrous metals, making it a versatile addition to production and maintenance toolkits. The cylindrical shank fits standard chucks and holders, while the extended overall length permits countersinking in deeper or harder-to-reach holes without frequent tool changes. This flexibility reduces setup time and keeps multiple process steps within a tight production window.

Practical cutting data for safe, efficient operation

For reliable results in steel up to 500 N the specified feed is 0.2 mm/rev; this parameter balances material removal with surface finish and limits thermal loading on the cutting edges. The 90° angle is the industry standard for fastener countersinks and facilitates correct seating of screws and rivets. Operators should secure the workpiece, maintain steady feed, and use appropriate cutting fluid where required to prolong tool life and preserve the finish.

Workshop benefits: durability, stability and process uptime

The combination of HSS material and a three-flute geometry gives a good compromise between edge life and toughness, particularly for mixed-material jobs. The extended shank minimises the need for tool swaps when working on assemblies with variable thickness, supporting higher process uptime. Choosing a countersink with these characteristics reduces rework, supports consistent product quality and contributes to predictable production costs over time.

Contact Metav Werkzeuge for personalised application advice and availability of the TECWERK countersink — call +49 2822 7131930 or email info@metav-werkzeuge.com

Technical data

• Article number: 2000865394NW
• Manufacturer: TECWERK
• Description: Conical countersink DIN 335 C, 90° Ø20.5 mm, HSS
• Packaging unit: 1

Facts

• Diameter: 20.5 mm
• Countersink angle: 90°
• Number of flutes: 3
• Feed recommendation in steel ≤500 N: 0.2 mm/rev
• Shank: cylindrical
• Length: extended (over-long)

Special features

• HSS material
• DIN 335 C standard geometry
• Extended shank for deep countersinking
• Three-flute design for reduced vibration and rattle-free cutting
• Application: countersinking and deburring in steel, cast iron, non‑ferrous metals

FAQ

What materials can this countersink be used on?
The TECWERK conical countersink is suitable for steel, cast iron and non‑ferrous metals, as specified in the product information.

What does DIN 335 C signify for this tool?
DIN 335 C indicates the standardised conical countersink geometry; the TECWERK tool conforms to this for predictable seating and chamfer profiles.

How does the three-flute design affect performance?
The three-flute geometry of the TECWERK countersink produces a rattle-free cut with reduced vibration, improving surface finish and extending usable edge life.

Is the extended shank suitable for deep countersinking?
Yes — the over-long design allows deeper countersinking and better reach into assemblies without frequent tool changes.

Which feed should be used in steel for optimal results?
Follow the recommended feed of 0.2 mm/rev in steel up to 500 N to balance finish and tool life; this parameter is given with the TECWERK countersink.

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