3mm NC Machine Reamer H7 Form B HSS-Co Right-Hand Helical With Cylindrical Shank - TECWERK

Combining HSS‑Co hardness, Form B geometry and H7 tolerance, this tool provides precise, repeatable hole finishes for assembly fits. The left‑hand helix with right‑hand cutting and cylindrical shank enhance chip control and runout stability. Order the TECWERK reamer directly via Metav Werkzeuge or contact our consultants for application support and delivery from Emmerich.

NC machine reamer DIN 212-3 H7 Form B D.3mm HSS-Co TECWERK

The NC machine reamer DIN 212‑3 H7 Form B D.3mm HSS‑Co TECWERK is a finishing reamer designed for producing accurate fits in steel, GGG and non‑ferrous metals on CNC machining centres

• HSS‑Co for high wear resistance
• Tolerance H7 for precise fits
• Left‑hand helix with right‑hand cutting
• Cylindrical shank, unequal spacing

Reliable fits through precise tolerance control

With a machined tolerance of H7, this finishing tool secures predictable clearances for press and running fits. The specified tolerance refers to the shaft and hole relationship after reaming, making the component ready for assembly without additional fitting operations. The controlled geometry minimises material removal variance, which translates into fewer rejects and consistent batch quality when producing mating parts for jigs, fixtures or assemblies.

Extended tool life and stable cutting performance

Manufactured in HSS‑Co, the reamer offers improved wear resistance compared with conventional high‑speed steels, maintaining cutting edge integrity over longer cycles. This material choice reduces flank wear in serial production and supports repeatable surface finish values. For operations where tool change‑over time affects throughput, the enhanced durability contributes directly to uptime and lower per‑part tooling costs.

Optimised flute and shank design for machine integration

The combination of a left‑hand helix and right‑hand cutting action improves chip evacuation while maintaining the cutting direction needed for positive chamfer control. The cylindrical shank and unequal spacing of flutes reduce harmonic vibration and support superior runout accuracy when paired with high‑precision chucks. When used with hydro expansion chucks, high‑accuracy collets or shrink‑fit holders, the tool delivers the concentricity required for tight tolerance reaming on NC machines.

Application focus and operational advantages

Engineered for both blind and through holes in steel, GGG (ductile cast iron) and non‑ferrous metals, the reamer is suited to finishing after drilling or boring operations. Its Form B geometry is tailored to achieve repeatable hole dimensions with a good surface finish, limiting secondary operations. The tool’s right‑hand cutting profile supports efficient feed rates on CNC centres while the flute configuration reduces clogging in softer alloys, keeping cycle times predictable and assembly tolerances stable.

For machining operations requiring stable runout and consistent H7 fits, request application advice and supply from Metav Werkzeuge – Metav’s specialists in Emmerich will assist with selection and delivery

Technical data

• Article number: 2000865302NW
• Label: NC-Maschinenreibahle DIN 212-3 H7 Form B D.3mm HSS-Co TECWERK
• Manufacturer: TECWERK

Facts

• Diameter: 3 mm
• Tolerance: H7
• Form: B
• Packaging unit: 1

Special features

• Material: HSS‑Co
• Right‑hand cutting
• Left‑hand helix (drall)
• Drall‑fluted design (drallgenutet)
• Cylindrical shank
• Unequal flute spacing
• For blind and through holes in steel, GGG and non‑ferrous metals
• Suitable for use with hydro expansion chucks, high‑precision collets and shrink‑fit holders

FAQ

What materials can this reamer machine?
The TECWERK NC machine reamer in HSS‑Co is designed for steel, GGG (ductile cast iron) and a range of non‑ferrous metals, providing reliable finishes for these materials.

Does the tool deliver H7 holes directly?
When used under correct machining conditions, the tool’s H7 tolerance and Form B geometry enable direct production of H7 fits suitable for common assembly tolerances.

How does the flute geometry affect performance?
The left‑hand helix combined with right‑hand cutting improves chip evacuation and reduces vibration, enhancing surface finish and runout accuracy in serial production.

Is the reamer compatible with precision chucks?
Yes — the cylindrical shank is intended for use with hydro expansion chucks, high‑accuracy collets or shrink‑fit holders to achieve the highest concentricity.

What hole types is the reamer suitable for?
The cutter is specified for both blind and through holes and is optimised for finishing after drilling or boring to obtain precise diameters and consistent surface quality.

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