12mm ER 25-GB Collet 9mm Square For Threading, 15 µm Runout · 40mm Length - TECWERK

Fast, precise clamping with 15 µm runout and a 12 mm bore delivers consistent concentricity and reliable thread-cutting performance; the ER‑GB design to DIN 6499 with an internal square helps secure taps and cutters for repeatable results. Order the ER‑GB collet directly via Metav Werkzeuge or ask our consultants if needed.

ER‑GB collet (ER 25‑GB) — 12 mm bore, 15 µm runout | TECWERK

A ER‑GB collet designed for precision clamping in thread‑cutting and general ER chuck applications, complying with DIN 6499 for professional workshop use

• ER‑GB design to DIN 6499
• Internal square for thread‑cutting
• High runout accuracy 15 µm
• 12 mm bore, 40 mm length

Maintain concentricity for consistent part quality

The primary advantage of this clamping sleeve is its runout accuracy: at 15 µm the collet ensures the tool axis remains highly concentric to the spindle, which directly reduces wobble and improves surface finish. For processes such as tapping or small‑diameter milling, this level of precision minimises thread errors and reduces scrap rates. In practical terms, better concentricity prolongs cutter life and lowers rework, supporting a smoother production flow.

Secure thread‑cutting and straightforward compatibility

Equipped with an internal square specifically to accommodate taps, the collet streamlines thread‑cutting operations and prevents slippage during torque transfer. Built to DIN 6499 standards, the clamping sleeve fits ER‑type holders and is suitable for use in thread‑cutting and ER collet chucks. Key dimensions — 12 mm bore, 9 mm internal square and 40 mm length — provide a compact, robust interface that integrates easily into existing tooling systems without extensive setup changes.

Practical benefits for the workshop and process reliability

With its compact 40 mm length and standard ER‑GB geometry, the component is easy to handle, replace and stock. The precise fit reduces setup time and helps maintain repeatability across batches, while the standardised form factor makes it compatible with a wide range of ER chucks and toolholders. This combination of precision and practicality supports efficient machining cycles and dependable results in daily shopfloor use.

For secure thread‑cutting and reliable clamping choose the TECWERK ER‑GB collet via Metav Werkzeuge — expert advice and fast supply from Emmerich are available at info@metav-werkzeuge.com or by phone on +49 2822 7131930

Technical data

• Article number: 2000834976NW
• Type: ER 25-GB
• Product: GB collet
• Brand: TECWERK

Core dimensions

• Clamping range: 12 mm
• Bore (d): 12 mm
• Length (L): 40 mm
• Internal square: 9 mm
• Runout: 15 µm

Special features

• DIN 6499 construction
• Internal square for thread‑cutting
• Suitable for thread‑cutting and ER chucks
• Precise toolholding for repeatable results

FAQ

What spindle runout can be expected with this collet?
The listed runout for the ER‑GB collet is 15 µm, which indicates the concentricity you can expect when the collet is combined with a properly prepared ER holder and spindle.

Is this collet suitable for tapping operations?
Yes. The internal square is intended for thread‑cutting applications so taps can be held securely during torque transmission.

Which ER holders are compatible with this collet?
The collet follows DIN 6499 geometry and is compatible with standard ER collet chucks and thread‑cutting collet holders designed for ER‑GB series parts.

What are the key dimensions to check during tool setup?
Important dimensions include the 12 mm bore, 9 mm internal square and 40 mm length; these determine fit, engagement and axial support in the holder.

How does this collet improve tool life?
By reducing runout and improving concentricity, the ER‑GB collet lowers lateral loads on cutters and taps, which typically extends tool life and helps maintain consistent part quality.

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