4mm NC Machine Reamer H7 Form B HSS-Co Spiral Fluted Right Hand Cylindrical Shank - TECWERK

Take advantage of the precise H7 tolerance and durable HSS‑Co construction for consistent, process‑secure hole finishes; pair with high‑accuracy clamping solutions from Metav Werkzeuge to achieve superior runout and repeatability. Order the NC machine reamer directly via Metav Werkzeuge or consult the technical team for application-specific pairing.

NC machine reamer Ø4 mm — DIN 212‑3, H7, Form B by TECWERK

The NC machine reamer Ø4 mm (Form B) is a spiral‑fluted, HSS‑Co tool for producing precision fits in blind and through holes.

• HSS‑Co material for high wear resistance
• Tolerance H7 for precision fit
• Spiral‑fluted, left‑hand helix cut
• Suitable for steel, GGG and non‑ferrous metals

Accurate fits through H7 tolerance and robust HSS‑Co construction

The reamer delivers consistently tight H7 tolerances thanks to its HSS‑Co substrate, which offers a combination of hardness and toughness under continuous machining. This balance reduces edge wear and maintains hole geometry over longer production runs, resulting in fewer rejects and less rework. For process planners, the result is a reliable production step that supports predictable assembly fits and minimises downstream adjustments.

Improved chip control and hole quality with spiral flutes

A spiral‑fluted geometry with a left‑hand helix promotes controlled chip evacuation and reduces the tendency for chatter in both blind and through holes. The uneven pitch helps to dampen vibration, producing a cleaner bore surface and better concentricity. In practice, this means the tool excels when machining a range of materials — from carbon and alloy steels to GGG castings and non‑ferrous metals — while preserving surface integrity and dimensional stability.

Enhanced process security with precise clamping compatibility

Designed with a cylindrical shank and optimised for use with hydro‑expansion, high‑accuracy collet or shrink chucks, the tool supports extremely low runout values when paired correctly. This mechanical compatibility ensures high runout accuracy and repeatable positioning in NC‑driven operations, which is essential for serial production and tight tolerance assemblies. Combining the reamer with precision tooling reduces cycle variation and increases throughput reliability.

Operational benefits for workshop and production use

Right‑hand cutting direction and the tool’s specification to DIN 212‑3, Form B make it suitable for direct integration into established machining processes. The combination of HSS‑Co and spiral‑flute design yields a durable cutter that sustains dimensional accuracy under continuous use, offering a balance between tool life and hole quality. Where process consistency is a priority, this reamer contributes to fewer stoppages and a more predictable maintenance cadence.

Contact Metav Werkzeuge for tailored clamping and process advice on TECWERK reamers — call +49 2822 7131930 or e‑mail info@metav-werkzeuge.com for application recommendations and availability

Technical data

• Article number: 2000865304NW
• SKU: 2000865304NW
• Brand: TECWERK

Facts

• Diameter: 4 mm
• Tolerance: H7
• Standard: DIN 212‑3
• Packaging unit: 1

Special features

• Material: HSS‑Co
• Form: B
• Right‑hand cutting
• Spiral‑fluted (drall‑grooved)
• Left‑hand helix
• Cylindrical shank
• Unequal pitch
• For blind and through holes in steel, GGG and non‑ferrous metals

FAQ

What materials can this NC machine reamer process?
The TECWERK NC machine reamer is specified for use in steel, GGG (cast iron) and various non‑ferrous metals, offering versatility across common workshop substrates.

What tolerance does the reamer achieve?
This tool is manufactured for a H7 tolerance, delivering precision fits suitable for press or slip fits in assembly processes.

Which shank and clamping options ensure best performance?
A cylindrical shank combined with hydro‑expansion, high‑accuracy collet or shrink chucks provides the best runout accuracy and process security when using the reamer.

Is the spiral‑fluted geometry suitable for blind holes?
Yes — the spiral flutes and unequal pitch support efficient chip evacuation and reduced vibration, making the cutter appropriate for both blind and through hole applications.

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