The Omega ER40 Collet Coolant Sealed Ultra Precision 8mm is a precision tool holder engineered for high-pressure cooling and tight tolerances. With sub-10 μm run-out and a sealed coolant path, it keeps your cutting tools aligned and cooling efficient across a 3–26 mm clamping range.

Designed for engineers, machinists, and workshop professionals, this collet supports demanding applications where coolant delivery and accuracy matter. Newer versions remove the rubber seal on the nose for improved reliability under pressure, while a unique non-overlapping slot arrangement minimizes coolant leaks even at 120 bar.

• Ultra-precise run-out (<10 μm): Delivers sub-10 micron accuracy to improve part tolerances, reduce finishing passes, and extend tool life through steadier cutting performance.
• High-pressure coolant sealed with integral metal seal: Built to withstand up to 120 bar, with a 3–26 mm clamping range, delivering consistent cooling and chip evacuation for cleaner cuts and longer tool life.
• Leak-resistant, round-shank compatible seal design: Longitudinal slots do not overlap at the centre to prevent coolant loss; seal relies on round shank tooling (no clamping flats) for reliable, leak-free operation. If tooling has flats, the seal will be ineffective.

This combination of precision, cooling efficiency, and robust sealing translates into faster cycle times, reduced downtime, and more consistent part quality across long runs. The ER40 Collet is an ideal choice for CNC milling, drilling, and finishing tasks where reliable cooling and accurate tool guidance matter most.