7mm ER25 Collet With 5.5mm Internal Square For Thread Cutting, 15 µm Runout - TECWERK

Benefit from consistent concentricity and the built-in drive for secure thread-cutting: the combination of 15 µm runout accuracy and the DIN 6499 internal square supports precise, repeatable production and reduces rework. Order the ER 25‑GB collet directly via Metav Werkzeuge or consult the technical team for application-specific guidance.

ER 25-GB GB collet – 7 mm bore, internal 5.5 mm square (TECWERK)

A ER 25‑GB collet engineered for thread-cutting applications with a DIN 6499 internal square, compatible with ER collet chucks and designed for accurate clamping in metalworking environments

• DIN 6499 internal square for thread-cutting
• High runout accuracy: 15 µm
• 7 mm clamping diameter, 34 mm length
• Inner square 5.5 mm for secure drive

Precision where concentricity matters

Consistent spindle-to-tool alignment improves surface finish and extends tool life; the 15 µm runout specification indicates tight geometric control of concentricity during rotation. For machining operations where even small deviations cause scrap or rework, a collet with verified runout performance provides measurable benefits: fewer rejects, longer insert life and predictable machining results. This level of concentricity is particularly valuable for finishing passes and fine-thread turning, where dimensional accuracy and surface integrity are critical.

Built for reliable thread-cutting and torque transmission

The collet incorporates a DIN 6499 internal square intended for thread-cutting operations, ensuring positive engagement with thread-cutting holders and taps. The internal 5.5 mm square translates torque reliably from the holder to the tool, reducing slippage during cutting cycles. With a 7 mm clamping diameter and a compact length of 34 mm, the component is suited to standard ER-type setups while maintaining a secure connection between tool and chuck. This design reduces set-up time through straightforward insertion and secure drive during machining.

Practical fitment and workshop advantages

Compact dimensions and standardised interfaces make the collet straightforward to integrate into existing ER collet chucks, supporting rapid tool changes and consistent repeatability across batches. The compact profile and standard drive geometry simplify inventory management for toolrooms and production shops that rely on interchangeable clamping elements. In addition to precision, the component’s compatibility with thread-cutting fixtures streamlines processes where both holding accuracy and torque transfer are required, making it a practical choice for maintenance, small-batch production and series manufacturing alike.

For workshop teams seeking dependable concentricity and proven thread-cutting capability, request the TECWERK ER 25‑GB collet from Metav Werkzeuge or consult the Metav specialists for tailored application advice.

Technical data

• Article number: 2000834963NW
• Type: ER 25-GB
• Product: GB collet
• Manufacturer: TECWERK

Facts

• Clamping diameter: 7 mm
• Length (L): 34 mm
• Bore (d): 7 mm
• Inner square: 5.5 mm
• Runout accuracy: 15 µm

Special features

• DIN 6499 internal square for thread-cutting
• Suitable for thread-cutting and ER collet chucks
• Positive torque transmission via inner square
• Compact design for easy interchangeability

FAQ

What clamping diameter does this collet accept? The ER 25‑GB collet clamps a 7 mm diameter tool, specified as the clamping bore in the product data.

Is this collet suitable for thread-cutting operations? Yes, the design includes a DIN 6499 internal square intended for thread-cutting holders and secure torque transfer during tapping or threading.

What runout accuracy can be expected from this collet? The collet is specified with a runout accuracy of 15 µm, which supports tight concentricity requirements in machining.

Which chucks are compatible with this collet? The component is designed for use with ER collet chucks and thread-cutting collet holders compatible with DIN 6499 interface geometry.

What are the key dimensions of the ER 25‑GB? Key dimensions are: length 34 mm, bore 7 mm and inner square 5.5 mm; the SKU for reference is 2000834963NW.

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